SG3300_4400UD-MV System Manual (New Version).pdf
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Dec 28, 2023
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About This Presentation
manual
Slide Content
SG3300UD-MV/SG4400UD-
MV
MVGrid-Connected
InverterSystemManualSG3300_
4400UD-MV-SEN-Ver32–202308M-D-
000582
SystemManual
MVGrid-ConnectedInverter
SG3300UD-MV/SG4400UD-MV
SG3300_4400UD-MV-SEN-Ver32–202308
MV
MVGrid-Connected
InverterSystemManualSG3300_
4400UD-MV-SEN-Ver32–202308M-D-
000582
SystemManual
MVGrid-ConnectedInverter
SG3300UD-MV/SG4400UD-MV
SG3300_4400UD-MV-SEN-Ver32–202308
I
AllRightsReserved
AllRightsReserved
Nopartofthisdocumentcanbereproducedinanyformorbyanymeanswithouttheprior
writtenpermissionofSungrowPowerSupplyCo.,Ltd(hereinafter"SUNGROW").
Trademarks
andotherSungrowtrademarksusedinthismanualareownedby
SUNGROW.
Allothertrademarksorregisteredtrademarksmentionedinthismanualareownedbytheir
respectiveowners.
SoftwareLicenses
•ItisprohibitedtousedatacontainedinfirmwareorsoftwaredevelopedbySUNGROW,
inpartorinfull,forcommercialpurposesbyanymeans.
•Itisprohibitedtoperformreverseengineering,cracking,oranyotheroperationsthat
compromisetheoriginalprogramdesignofthesoftwaredevelopedbySUNGROW.
AllRightsReserved
AllRightsReserved
Nopartofthisdocumentcanbereproducedinanyformorbyanymeanswithouttheprior
writtenpermissionofSungrowPowerSupplyCo.,Ltd(hereinafter"SUNGROW").
Trademarks
andotherSungrowtrademarksusedinthismanualareownedby
SUNGROW.
Allothertrademarksorregisteredtrademarksmentionedinthismanualareownedbytheir
respectiveowners.
SoftwareLicenses
•ItisprohibitedtousedatacontainedinfirmwareorsoftwaredevelopedbySUNGROW,
inpartorinfull,forcommercialpurposesbyanymeans.
•Itisprohibitedtoperformreverseengineering,cracking,oranyotheroperationsthat
compromisetheoriginalprogramdesignofthesoftwaredevelopedbySUNGROW.
III
Contents
AllRightsReserved.....................................................................................................I
1AboutThisManual ...........................................................................................1
1.1Validity...........................................................................................................1
1.2TargetGroup..................................................................................................1
1.3HowtoUseThisManual.................................................................................1
1.4SymbolExplanations......................................................................................2
2SafetyInstructions ............................................................................................3
2.1UnpackingandInspection...............................................................................4
2.2HoistingandTransportation.............................................................................4
2.3ElectricalConnection......................................................................................5
2.4Operation.......................................................................................................6
2.5OperationandMaintenance............................................................................6
2.6Disposal........................................................................................................8
3ProductDescription ..........................................................................................9
3.1ProductIntroduction........................................................................................9
3.2ProductComposition......................................................................................9
3.3MainInternalEquipment...............................................................................11
3.3.1AppearanceofInverterUnit.................................................................11
3.3.2InternalStructureofInverterUnit..........................................................12
3.3.3MainPartsofTransformer...................................................................13
3.3.4MainPartsofPowerDistributionCabinet..............................................14
3.4SymbolonProducts......................................................................................16
4TransportandStorage ...................................................................................17
4.1Precautions..................................................................................................17
4.2TransportationRequirements........................................................................17
4.3StorageRequirements..................................................................................17
5MechanicalMounting .....................................................................................19
5.1SafetyPrecautions.......................................................................................19
5.2InspectionBeforeInstallation.........................................................................20
5.2.1ScopeofDelivery................................................................................20
5.2.2ProductInspection..............................................................................21
Contents
AllRightsReserved.....................................................................................................I
1AboutThisManual ...........................................................................................1
1.1Validity...........................................................................................................1
1.2TargetGroup..................................................................................................1
1.3HowtoUseThisManual.................................................................................1
1.4SymbolExplanations......................................................................................2
2SafetyInstructions ............................................................................................3
2.1UnpackingandInspection...............................................................................4
2.2HoistingandTransportation.............................................................................4
2.3ElectricalConnection......................................................................................5
2.4Operation.......................................................................................................6
2.5OperationandMaintenance............................................................................6
2.6Disposal........................................................................................................8
3ProductDescription ..........................................................................................9
3.1ProductIntroduction........................................................................................9
3.2ProductComposition......................................................................................9
3.3MainInternalEquipment...............................................................................11
3.3.1AppearanceofInverterUnit.................................................................11
3.3.2InternalStructureofInverterUnit..........................................................12
3.3.3MainPartsofTransformer...................................................................13
3.3.4MainPartsofPowerDistributionCabinet..............................................14
3.4SymbolonProducts......................................................................................16
4TransportandStorage ...................................................................................17
4.1Precautions..................................................................................................17
4.2TransportationRequirements........................................................................17
4.3StorageRequirements..................................................................................17
5MechanicalMounting .....................................................................................19
5.1SafetyPrecautions.......................................................................................19
5.2InspectionBeforeInstallation.........................................................................20
5.2.1ScopeofDelivery................................................................................20
5.2.2ProductInspection..............................................................................21
IV
5.3InstallationEnvironmentRequirements..........................................................21
5.3.1InstallationSite...................................................................................21
5.3.2Foundation.........................................................................................21
5.3.3InstallationSpacing.............................................................................22
5.4HoistingandFixing.......................................................................................22
5.4.1PreparationBeforeHoisting.................................................................22
5.4.2Requirementsforhoistandliftingrope..................................................23
5.4.3DuringHoisting...................................................................................23
5.4.4FasteningofConnectors......................................................................24
5.4.5Fixing.................................................................................................25
6ElectricalConnection .....................................................................................27
6.1Precautions..................................................................................................27
6.2WiringOverview...........................................................................................28
6.3PreparationBeforeWiring.............................................................................29
6.3.1InstallationTools.................................................................................29
6.3.2OpentheProductDoor........................................................................30
6.3.3Cables...............................................................................................31
6.3.4PositionofCableInlet..........................................................................31
6.3.4.1CableInletPreparation..............................................................32
6.4GroundConnection......................................................................................32
6.4.1Overview............................................................................................33
6.4.2GroundingFlatSteel...........................................................................33
6.4.3GroundingCable.................................................................................33
6.5DCInputConnection.....................................................................................34
6.5.1Overview............................................................................................34
6.5.2InstallingInsulationBoardbeforeConnection........................................36
6.5.3Procedure..........................................................................................37
6.6ACSideConnection.....................................................................................39
6.6.1InspectionBeforeWiring......................................................................39
6.6.2Procedure..........................................................................................39
6.7CommunicationConnection..........................................................................41
6.7.1Overview............................................................................................41
6.7.2Procedure..........................................................................................41
6.8Switch/EthernetCommunication....................................................................41
6.9CheckAfterWiring........................................................................................42
6.9.1Inspection..........................................................................................42
6.9.2LockingCabinetDoor..........................................................................42
5.3InstallationEnvironmentRequirements..........................................................21
5.3.1InstallationSite...................................................................................21
5.3.2Foundation.........................................................................................21
5.3.3InstallationSpacing.............................................................................22
5.4HoistingandFixing.......................................................................................22
5.4.1PreparationBeforeHoisting.................................................................22
5.4.2Requirementsforhoistandliftingrope..................................................23
5.4.3DuringHoisting...................................................................................23
5.4.4FasteningofConnectors......................................................................24
5.4.5Fixing.................................................................................................25
6ElectricalConnection .....................................................................................27
6.1Precautions..................................................................................................27
6.2WiringOverview...........................................................................................28
6.3PreparationBeforeWiring.............................................................................29
6.3.1InstallationTools.................................................................................29
6.3.2OpentheProductDoor........................................................................30
6.3.3Cables...............................................................................................31
6.3.4PositionofCableInlet..........................................................................31
6.3.4.1CableInletPreparation..............................................................32
6.4GroundConnection......................................................................................32
6.4.1Overview............................................................................................33
6.4.2GroundingFlatSteel...........................................................................33
6.4.3GroundingCable.................................................................................33
6.5DCInputConnection.....................................................................................34
6.5.1Overview............................................................................................34
6.5.2InstallingInsulationBoardbeforeConnection........................................36
6.5.3Procedure..........................................................................................37
6.6ACSideConnection.....................................................................................39
6.6.1InspectionBeforeWiring......................................................................39
6.6.2Procedure..........................................................................................39
6.7CommunicationConnection..........................................................................41
6.7.1Overview............................................................................................41
6.7.2Procedure..........................................................................................41
6.8Switch/EthernetCommunication....................................................................41
6.9CheckAfterWiring........................................................................................42
6.9.1Inspection..........................................................................................42
6.9.2LockingCabinetDoor..........................................................................42
V
7PoweringupandPoweringdown ................................................................44
7.1SafetyInstructions........................................................................................44
7.2PoweringUpOperations...............................................................................44
7.2.1RemovingFilmonProduct...................................................................44
7.2.2RemovingPressureReliefScrew.........................................................45
7.2.3InstallingFuseinACSPD....................................................................46
7.2.4AdjustingDe-energizedTapChanger...................................................46
7.2.5OpeningPressureReliefValve.............................................................47
7.2.6RemovingFoamPartfromOilThermometer.........................................47
7.2.7DrainingOilfromTransformer..............................................................47
7.3InspectionBeforePoweringUp......................................................................48
7.3.1Inverter...............................................................................................48
7.3.2PVArray.............................................................................................49
7.3.3CheckingGridVoltage.........................................................................49
7.3.4Transformer........................................................................................49
7.4PoweringUpSteps.......................................................................................50
7.5PoweringDownOperations...........................................................................50
7.5.1PlannedPoweringDown......................................................................50
7.5.2Unplanned(Emergency)PoweringDown..............................................51
8O&MonWEB ..................................................................................................52
8.1CommunicationsDiagram.............................................................................52
8.2PreparationBeforeLogin..............................................................................53
8.2.1Login(PC)..........................................................................................53
8.2.2Login(MobileDevice)..........................................................................53
8.3LoginSteps..................................................................................................54
8.4InterfaceIntroduction....................................................................................54
8.4.1Homepage..........................................................................................54
8.4.2ViewingFaultInformation....................................................................55
8.4.3ViewingAlarmInformation...................................................................55
8.4.4Boot/Shutdown...................................................................................55
8.4.5SettingInitialParameters.....................................................................55
8.4.6SettingOperationParameters..............................................................56
8.4.7SettingSystemParameters.................................................................56
8.4.8SettingProtectionParameters..............................................................56
8.5ModifyingPassword......................................................................................56
8.6Logout.........................................................................................................57
7PoweringupandPoweringdown ................................................................44
7.1SafetyInstructions........................................................................................44
7.2PoweringUpOperations...............................................................................44
7.2.1RemovingFilmonProduct...................................................................44
7.2.2RemovingPressureReliefScrew.........................................................45
7.2.3InstallingFuseinACSPD....................................................................46
7.2.4AdjustingDe-energizedTapChanger...................................................46
7.2.5OpeningPressureReliefValve.............................................................47
7.2.6RemovingFoamPartfromOilThermometer.........................................47
7.2.7DrainingOilfromTransformer..............................................................47
7.3InspectionBeforePoweringUp......................................................................48
7.3.1Inverter...............................................................................................48
7.3.2PVArray.............................................................................................49
7.3.3CheckingGridVoltage.........................................................................49
7.3.4Transformer........................................................................................49
7.4PoweringUpSteps.......................................................................................50
7.5PoweringDownOperations...........................................................................50
7.5.1PlannedPoweringDown......................................................................50
7.5.2Unplanned(Emergency)PoweringDown..............................................51
8O&MonWEB ..................................................................................................52
8.1CommunicationsDiagram.............................................................................52
8.2PreparationBeforeLogin..............................................................................53
8.2.1Login(PC)..........................................................................................53
8.2.2Login(MobileDevice)..........................................................................53
8.3LoginSteps..................................................................................................54
8.4InterfaceIntroduction....................................................................................54
8.4.1Homepage..........................................................................................54
8.4.2ViewingFaultInformation....................................................................55
8.4.3ViewingAlarmInformation...................................................................55
8.4.4Boot/Shutdown...................................................................................55
8.4.5SettingInitialParameters.....................................................................55
8.4.6SettingOperationParameters..............................................................56
8.4.7SettingSystemParameters.................................................................56
8.4.8SettingProtectionParameters..............................................................56
8.5ModifyingPassword......................................................................................56
8.6Logout.........................................................................................................57
VI
9Troubleshooting ..............................................................................................58
9.1InverterTroubleshooting...............................................................................58
9.1.1ViewingFault/AlarmInformation...........................................................58
9.1.2CheckMethod....................................................................................58
9.2OtherFaults.................................................................................................70
10RoutineMaintenance ..................................................................................72
10.1SafetyInstructions......................................................................................72
10.2MaintenancePeriod....................................................................................74
10.2.1Maintenance(OnceEveryThreeYears)..............................................74
10.2.2Maintenance(Everytwoyears)..........................................................75
10.2.3Maintenance(OnceAYear)...............................................................76
10.2.4Maintenance(Everyhalfayeartoonceayear)...................................77
10.3CommonMaintenanceItems.......................................................................78
10.3.1CleaningAirInletofInverter...............................................................78
10.3.2CleaningAirOutletofInverter............................................................79
10.3.3CleaningAirInletofPowerDistributionCabinet...................................80
10.3.4CleaningAirOutletofPowerDistributionCabinet................................80
10.3.5AppearanceRepair...........................................................................81
10.3.5.1ErasableTraces......................................................................81
10.3.5.2IndelibleTraces.......................................................................81
10.3.5.3BrokenPrimer.........................................................................82
10.3.6CheckingDoorLocksandHinges.......................................................83
10.3.7CheckingSealingStrips.....................................................................83
10.4ReplacingFuse..........................................................................................83
10.4.1ReplacingDCSideFuse....................................................................83
10.4.2ReplacingFuseInsidePowerDistributionCabinet...............................84
10.5ReplacingFans..........................................................................................84
11Appendix ........................................................................................................85
11.1TechnicalParameters..................................................................................85
11.2TighteningTorques.....................................................................................86
11.3QualityAssurance.......................................................................................87
11.4ContactInformation.....................................................................................88
9Troubleshooting ..............................................................................................58
9.1InverterTroubleshooting...............................................................................58
9.1.1ViewingFault/AlarmInformation...........................................................58
9.1.2CheckMethod....................................................................................58
9.2OtherFaults.................................................................................................70
10RoutineMaintenance ..................................................................................72
10.1SafetyInstructions......................................................................................72
10.2MaintenancePeriod....................................................................................74
10.2.1Maintenance(OnceEveryThreeYears)..............................................74
10.2.2Maintenance(Everytwoyears)..........................................................75
10.2.3Maintenance(OnceAYear)...............................................................76
10.2.4Maintenance(Everyhalfayeartoonceayear)...................................77
10.3CommonMaintenanceItems.......................................................................78
10.3.1CleaningAirInletofInverter...............................................................78
10.3.2CleaningAirOutletofInverter............................................................79
10.3.3CleaningAirInletofPowerDistributionCabinet...................................80
10.3.4CleaningAirOutletofPowerDistributionCabinet................................80
10.3.5AppearanceRepair...........................................................................81
10.3.5.1ErasableTraces......................................................................81
10.3.5.2IndelibleTraces.......................................................................81
10.3.5.3BrokenPrimer.........................................................................82
10.3.6CheckingDoorLocksandHinges.......................................................83
10.3.7CheckingSealingStrips.....................................................................83
10.4ReplacingFuse..........................................................................................83
10.4.1ReplacingDCSideFuse....................................................................83
10.4.2ReplacingFuseInsidePowerDistributionCabinet...............................84
10.5ReplacingFans..........................................................................................84
11Appendix ........................................................................................................85
11.1TechnicalParameters..................................................................................85
11.2TighteningTorques.....................................................................................86
11.3QualityAssurance.......................................................................................87
11.4ContactInformation.....................................................................................88
1
1AboutThisManual
Thismanualdescribesthetransportationandstorage,mechanicalinstallation,electrical
connection,powerupandshutdown,weboperation,troubleshooting,andmaintenanceof
theMVgrid-connectedinverter.
1.1Validity
Thismanualappliestothefollowingmodels:
•SG3300UD–MV
•SG4400UD–MV
Unlessotherwisespecified,thismanualtakesSG4400UD–MVasanexampletobrieflyin-
troducetheinstallationandoperationmethodsoftheproduct.
1.2TargetGroup
Thismanualisintendedforprofessionaltechnicianswhoareresponsiblefortheinstallation,
operation,andmaintenanceofMVgrid-connectedinverters.Theprofessionaltechnicianis
requiredtomeetthefollowingrequirements:
•Knowelectronic,electricalwiring,andmechanicalexpertise,andbefamiliarwithelectri-
calandmechanicalschematics.
•ShouldbefamiliarwiththecompositionandworkingprinciplesofthePVsystemandits
front-andrear-levelequipment.
•Havereceivedprofessionaltrainingrelatedtotheinstallationandcommissioningofelec-
tricalequipment.
•Beabletoquicklyrespondtohazardsoremergenciesthatoccurduringinstallationand
commissioning.
•Befamiliarwiththerelevantstandardsandspecificationsofthecountry/regionwherethe
projectislocated.
1.3HowtoUseThisManual
Pleasereadthismanualcarefullybeforeusingtheproductandkeepitproperlyataplace
foreasyaccess.
Theproductsandproductmanualsarealwaysintheprocessofimprovementandupgrade.
Ifthemanualreceivedisslightlyinconsistentwiththeproduct,itmaybearesultofaproduct
versionupgrade,andtheactualproductshallprevail.Foranyquestions,pleasecontact
SungrowCustomerService.
1AboutThisManual
Thismanualdescribesthetransportationandstorage,mechanicalinstallation,electrical
connection,powerupandshutdown,weboperation,troubleshooting,andmaintenanceof
theMVgrid-connectedinverter.
1.1Validity
Thismanualappliestothefollowingmodels:
•SG3300UD–MV
•SG4400UD–MV
Unlessotherwisespecified,thismanualtakesSG4400UD–MVasanexampletobrieflyin-
troducetheinstallationandoperationmethodsoftheproduct.
1.2TargetGroup
Thismanualisintendedforprofessionaltechnicianswhoareresponsiblefortheinstallation,
operation,andmaintenanceofMVgrid-connectedinverters.Theprofessionaltechnicianis
requiredtomeetthefollowingrequirements:
•Knowelectronic,electricalwiring,andmechanicalexpertise,andbefamiliarwithelectri-
calandmechanicalschematics.
•ShouldbefamiliarwiththecompositionandworkingprinciplesofthePVsystemandits
front-andrear-levelequipment.
•Havereceivedprofessionaltrainingrelatedtotheinstallationandcommissioningofelec-
tricalequipment.
•Beabletoquicklyrespondtohazardsoremergenciesthatoccurduringinstallationand
commissioning.
•Befamiliarwiththerelevantstandardsandspecificationsofthecountry/regionwherethe
projectislocated.
1.3HowtoUseThisManual
Pleasereadthismanualcarefullybeforeusingtheproductandkeepitproperlyataplace
foreasyaccess.
Theproductsandproductmanualsarealwaysintheprocessofimprovementandupgrade.
Ifthemanualreceivedisslightlyinconsistentwiththeproduct,itmaybearesultofaproduct
versionupgrade,andtheactualproductshallprevail.Foranyquestions,pleasecontact
SungrowCustomerService.
2
1.4SymbolExplanations
Toensurethesafetyoftheusersandtheirpropertieswhentheyusetheproductandto
makesurethattheproductisusedoptimallyandefficiently,thismanualprovidesuserswith
therelevantsafetyinformationwhichismarkedbythefollowingsymbols.Thesymbolsthat
maybeusedinthismanualarelistedbelow.Pleasereadcarefullytomakebetteruseofthis
manual.
DANGERindicateshigh-riskpotentialhazardsthat,ifnotavoided,mayleadto
deathorseriousinjury.
WARNINGindicatesmoderate-riskpotentialhazardsthat,ifnotavoided,maylead
todeathorseriousinjury.
CAUTIONindicatesaslightlyhazardoussituationwhich,ifnotavoided,mayresult
inminorormoderateinjury.
NOTICEindicatespotentialrisksthat,ifnotavoided,mayleadtodevicemalfunc-
tionsorfinanciallosses.
NOTEindicatesadditionalinformation,emphasizedcontentsortipstohelpyou
solveproblemsorsavetime.
1AboutThisManual SystemManual
1.4SymbolExplanations
Toensurethesafetyoftheusersandtheirpropertieswhentheyusetheproductandto
makesurethattheproductisusedoptimallyandefficiently,thismanualprovidesuserswith
therelevantsafetyinformationwhichismarkedbythefollowingsymbols.Thesymbolsthat
maybeusedinthismanualarelistedbelow.Pleasereadcarefullytomakebetteruseofthis
manual.
DANGERindicateshigh-riskpotentialhazardsthat,ifnotavoided,mayleadto
deathorseriousinjury.
WARNINGindicatesmoderate-riskpotentialhazardsthat,ifnotavoided,maylead
todeathorseriousinjury.
CAUTIONindicatesaslightlyhazardoussituationwhich,ifnotavoided,mayresult
inminorormoderateinjury.
NOTICEindicatespotentialrisksthat,ifnotavoided,mayleadtodevicemalfunc-
tionsorfinanciallosses.
NOTEindicatesadditionalinformation,emphasizedcontentsortipstohelpyou
solveproblemsorsavetime.
1AboutThisManual SystemManual
3
2SafetyInstructions
Wheninstalling,commissioning,operating,andmaintainingtheproduct,strictlyobservethe
labelsontheproductandthesafetyrequirementsinthemanual.Incorrectoperationorwork
maycause:
•Injuryordeathtotheoperatororathirdparty.
•Damagetotheproductandotherproperties.
•Donotoperatetheproductandcables(includingbutnotlimitedtomovingthe
product,installingtheproduct,operatingtheproductandcables,poweringup
theproduct,maintainingtheproduct,andworkingatheights)inharshweather
conditionssuchasflooding,lightning,rain,snow,andlevel6orstrongerwind.
•Incaseoffire,evacuatefromthebuildingorproductareaandcallthefirealarm.
Re-entryintotheburningareaisstrictlyprohibitedunderanycircumstances.
•Tightenthescrewswiththespecifiedtorqueusingtoolswhenfasteningthe
productandterminals.Otherwise,theproductmaybedamaged.Andtheda-
magecausedisnotcoveredbythewarranty.
•Learnhowtousetoolscorrectlybeforeusingthemtoavoidhurtingpeopleor
damagingthedevice.
•Maintainthedevicewithsufficientknowledgeofthismanualanduseproper
tools.
•Thesafetyinstructionsinthismanualareonlysupplementsandcannotcover
alltheprecautionsthatshouldbefollowed.Performoperationsconsideringac-
tualonsiteconditions.
•SUNGROW shallnotbeheldliableforanydamagecausedbyviolationofgen-
eralsafetyoperationrequirements,generalsafetystandards,oranysafetyin-
structioninthismanual.
•Wheninstalling,operating,andmaintainingtheproduct,complywithlocallaws
andregulations.Thesafetyprecautionsinthismanualareonlysupplements
tolocallawsandregulations.
2SafetyInstructions
Wheninstalling,commissioning,operating,andmaintainingtheproduct,strictlyobservethe
labelsontheproductandthesafetyrequirementsinthemanual.Incorrectoperationorwork
maycause:
•Injuryordeathtotheoperatororathirdparty.
•Damagetotheproductandotherproperties.
•Donotoperatetheproductandcables(includingbutnotlimitedtomovingthe
product,installingtheproduct,operatingtheproductandcables,poweringup
theproduct,maintainingtheproduct,andworkingatheights)inharshweather
conditionssuchasflooding,lightning,rain,snow,andlevel6orstrongerwind.
•Incaseoffire,evacuatefromthebuildingorproductareaandcallthefirealarm.
Re-entryintotheburningareaisstrictlyprohibitedunderanycircumstances.
•Tightenthescrewswiththespecifiedtorqueusingtoolswhenfasteningthe
productandterminals.Otherwise,theproductmaybedamaged.Andtheda-
magecausedisnotcoveredbythewarranty.
•Learnhowtousetoolscorrectlybeforeusingthemtoavoidhurtingpeopleor
damagingthedevice.
•Maintainthedevicewithsufficientknowledgeofthismanualanduseproper
tools.
•Thesafetyinstructionsinthismanualareonlysupplementsandcannotcover
alltheprecautionsthatshouldbefollowed.Performoperationsconsideringac-
tualonsiteconditions.
•SUNGROW shallnotbeheldliableforanydamagecausedbyviolationofgen-
eralsafetyoperationrequirements,generalsafetystandards,oranysafetyin-
structioninthismanual.
•Wheninstalling,operating,andmaintainingtheproduct,complywithlocallaws
andregulations.Thesafetyprecautionsinthismanualareonlysupplements
tolocallawsandregulations.
4
2.1UnpackingandInspection
Checkallsafetysigns,warninglabels,andnameplatesonproducts.
Ensurethatthesafetysigns,warninglabels,andnameplatesareclearlyvisible
andnotremovedorcoveredbeforetheproductisdecommissioned.
Afterreceivingtheproduct,checkwhethertheappearanceandstructuralpartsof
theproductaredamaged,whetherthetransformerleaksoil,andwhetherthepack-
inglistisconsistentwiththeactualorderedproduct.Ifthereareproblemswiththe
aboveinspectionitems,donotinstalltheproductandcontactSUNGROW intime.
2.2HoistingandTransportation
Riskofpersonalinjuryordevicedamageduetoincorrectoperation!
•Followtheprocedureofworkofheightswhenwalkingonthetopoftheproduct.
•Allhoistingandtransportationmustcomplywiththerelevantcodesandregula-
tionsofthenation/regionwheretheprojectislocated.
Allequipmentandtoolsusedduringoperationmusthavebeenregularly
maintained.
Improperhoistingmaycausepersonalinjury!
•Itisstrictlyprohibitedtostandwithin5m-10moutsidetheoperatingarea(i.e.,
undertheboomandthehoistedmachine)toavoidcasualties.
•Theproductmustbehoistedandmovedbyprofessionalpersonnel.Beforethe
operation,besuretowearpersonalprotectiveequipment.
•Stophoistingintheeventofsevereweather,suchasheavyrain,thickfog,or
strongwind.
•Whenhoistingandmovingtheproduct,beawareofitssizeandweightand
keepthebalancetopreventitfromturningoverorfalling.
2SafetyInstructions SystemManual
2.1UnpackingandInspection
Checkallsafetysigns,warninglabels,andnameplatesonproducts.
Ensurethatthesafetysigns,warninglabels,andnameplatesareclearlyvisible
andnotremovedorcoveredbeforetheproductisdecommissioned.
Afterreceivingtheproduct,checkwhethertheappearanceandstructuralpartsof
theproductaredamaged,whetherthetransformerleaksoil,andwhetherthepack-
inglistisconsistentwiththeactualorderedproduct.Ifthereareproblemswiththe
aboveinspectionitems,donotinstalltheproductandcontactSUNGROW intime.
2.2HoistingandTransportation
Riskofpersonalinjuryordevicedamageduetoincorrectoperation!
•Followtheprocedureofworkofheightswhenwalkingonthetopoftheproduct.
•Allhoistingandtransportationmustcomplywiththerelevantcodesandregula-
tionsofthenation/regionwheretheprojectislocated.
Allequipmentandtoolsusedduringoperationmusthavebeenregularly
maintained.
Improperhoistingmaycausepersonalinjury!
•Itisstrictlyprohibitedtostandwithin5m-10moutsidetheoperatingarea(i.e.,
undertheboomandthehoistedmachine)toavoidcasualties.
•Theproductmustbehoistedandmovedbyprofessionalpersonnel.Beforethe
operation,besuretowearpersonalprotectiveequipment.
•Stophoistingintheeventofsevereweather,suchasheavyrain,thickfog,or
strongwind.
•Whenhoistingandmovingtheproduct,beawareofitssizeandweightand
keepthebalancetopreventitfromturningoverorfalling.
2SafetyInstructions SystemManual
5
2.3ElectricalConnection
Beforeelectricalconnections,pleasemakesurethattheproductisnotdamaged.
Otherwise,itmaycausedanger!
Beforeelectricalconnections,pleasemakesurethattheproductswitchandall
switchesconnectedtotheproductaresetto"OFF",andusemeasuringequipment
toensurethatthereisnovoltageattheconnection.Otherwise,anelectricshock
mayoccur!
PVmoduleswillgeneratelethalhighvoltagewhenexposedtosunlight.
•Operatorsmustwearproperpersonalprotectiveequipmentduringelectrical
connections.
•Beforeperforminganelectricalconnection,besuretodisconnectthePVSand
usemeasuringequipmenttoensurethatcablesarevoltage-free.
•RespecttheprotectionrequirementsandprecautionsofPVmodules.
Dangertolifeduetoahighvoltageinsidetheinverter!
•Besuretousespecialinsulationtoolsduringcableconnections.
•Noteandobservethewarninglabelsontheproduct,andperformoperations
strictlyfollowingthesafetyinstructions.
•Respectallsafetyprecautionslistedinthismanualandotherpertinent
documents.
Damagetothedevicecausedbyincorrectwiringisnotcoveredbythewarranty.
•Electricalconnectionmustbeperformedbyprofessionalpersonnelwhowear
personalprotectiveequipment.
•AllcablesusedinthePVgenerationsystemmustbefirmlyattached,properly
insulated,andadequatelydimensioned.
SystemManual 2SafetyInstructions
2.3ElectricalConnection
Beforeelectricalconnections,pleasemakesurethattheproductisnotdamaged.
Otherwise,itmaycausedanger!
Beforeelectricalconnections,pleasemakesurethattheproductswitchandall
switchesconnectedtotheproductaresetto"OFF",andusemeasuringequipment
toensurethatthereisnovoltageattheconnection.Otherwise,anelectricshock
mayoccur!
PVmoduleswillgeneratelethalhighvoltagewhenexposedtosunlight.
•Operatorsmustwearproperpersonalprotectiveequipmentduringelectrical
connections.
•Beforeperforminganelectricalconnection,besuretodisconnectthePVSand
usemeasuringequipmenttoensurethatcablesarevoltage-free.
•RespecttheprotectionrequirementsandprecautionsofPVmodules.
Dangertolifeduetoahighvoltageinsidetheinverter!
•Besuretousespecialinsulationtoolsduringcableconnections.
•Noteandobservethewarninglabelsontheproduct,andperformoperations
strictlyfollowingthesafetyinstructions.
•Respectallsafetyprecautionslistedinthismanualandotherpertinent
documents.
Damagetothedevicecausedbyincorrectwiringisnotcoveredbythewarranty.
•Electricalconnectionmustbeperformedbyprofessionalpersonnelwhowear
personalprotectiveequipment.
•AllcablesusedinthePVgenerationsystemmustbefirmlyattached,properly
insulated,andadequatelydimensioned.
SystemManual 2SafetyInstructions
6
BeforeconnectingthePVmoduletothisproduct,checkandconfirmthepolarity
correctnessofthePVmodule,andthenconnectittothecorrespondingpositionof
thisproduct.
Duringtheinstallationandoperationoftheproduct,pleaseensurethatthepositive
ornegativepolaritiesofPVstringsdonotshort-circuittotheground.Otherwise,
anACorDCshort-circuitmayoccur,resultinginproductdamage.Thedamage
causedbythisisnotcoveredbythewarranty.
Complywiththeregulationsrelatedtothelocalgridduringwiring.
2.4Operation
Whentheproductisworking,
•Itisstrictlyforbiddentotouchthelivepartsoftheproduct.Otherwise,anelec-
tricshockmayoccur.
•Itisstrictlyprohibitedtodisassembleanypartsoftheproduct.Otherwise,an
electricshockmayoccur.
•Itisstrictlyprohibitedtotouchanyhotpartsoftheproduct(suchastheheat
sink).Otherwise,itmaycauseburns.
2.5OperationandMaintenance
Riskofinverterdamageorpersonalinjuryduetoincorrectservice!
•Beforemaintainingtheproduct,besuretodisconnecttheoutputswitchofthe
PVSandtheloadswitch/disconnectorofthetransformer.
•Aftertheinverterispoweredofffor20minutes,measurethevoltageandcur-
rentwithmeasuringequipment.Onlywhenthereisnovoltagenorcurrentcan
operatorswhowearprotectiveequipmentoperateandmaintaintheinverter.
•Duringmaintenance,besuretocheckthewarninglabelsintheproductand
complywiththerequirementsonthem.
•Eveniftheinverterisshutdown,itmaystillbehotandcauseburns.Operating
theinverterwithprotectiveglovesafteritcoolsdown.
2SafetyInstructions SystemManual
BeforeconnectingthePVmoduletothisproduct,checkandconfirmthepolarity
correctnessofthePVmodule,andthenconnectittothecorrespondingpositionof
thisproduct.
Duringtheinstallationandoperationoftheproduct,pleaseensurethatthepositive
ornegativepolaritiesofPVstringsdonotshort-circuittotheground.Otherwise,
anACorDCshort-circuitmayoccur,resultinginproductdamage.Thedamage
causedbythisisnotcoveredbythewarranty.
Complywiththeregulationsrelatedtothelocalgridduringwiring.
2.4Operation
Whentheproductisworking,
•Itisstrictlyforbiddentotouchthelivepartsoftheproduct.Otherwise,anelec-
tricshockmayoccur.
•Itisstrictlyprohibitedtodisassembleanypartsoftheproduct.Otherwise,an
electricshockmayoccur.
•Itisstrictlyprohibitedtotouchanyhotpartsoftheproduct(suchastheheat
sink).Otherwise,itmaycauseburns.
2.5OperationandMaintenance
Riskofinverterdamageorpersonalinjuryduetoincorrectservice!
•Beforemaintainingtheproduct,besuretodisconnecttheoutputswitchofthe
PVSandtheloadswitch/disconnectorofthetransformer.
•Aftertheinverterispoweredofffor20minutes,measurethevoltageandcur-
rentwithmeasuringequipment.Onlywhenthereisnovoltagenorcurrentcan
operatorswhowearprotectiveequipmentoperateandmaintaintheinverter.
•Duringmaintenance,besuretocheckthewarninglabelsintheproductand
complywiththerequirementsonthem.
•Eveniftheinverterisshutdown,itmaystillbehotandcauseburns.Operating
theinverterwithprotectiveglovesafteritcoolsdown.
2SafetyInstructions SystemManual
7
Thedevicesinsidetheinvertercarryhighvoltage.Touchingthesedevicesmay
leadtofatalelectricshock.
•Livelinemeasurementcanonlybeperformedbyprofessionalpersonnelwho
knowthePVsystemwell.Beforemeasurement,besuretotakeproperprotec-
tionmethods(e.g.,wearinsulatinggloves,etc.);
•Duringlivelinemeasurement,theoperatormustbeaccompaniedbyothersto
ensurepersonalsafety.
Electricshockorfiremayoccurduetodevicedamageorsystemfault.
•Visuallyinspectfordevicedamagesorotherhazardsbeforetheoperation
•Checkwhetherotherexternaldevicesorcircuitconnectionsareinasafestate.
•Makesurethedeviceisinasafestatebeforeoperating.
Ifsomedevicesneedtobereplacedduringoperationandmaintenance,please
contactSUNGROW.
Waitatleast20minutesaftertheproductstopsrunningandensurethatthevol-
tagehasdroppedtowithinthesafevoltagerange,thelow-voltagecabinetiscon-
nectedwiththegroundingcable,thetransferswitch,ifany,isinthegrounding
position,thegroundingswitch,ifany,isclosed,andtheloadswitch,ifany,isopen.
Afterconfirmingthatallinspectionitemsmeettherequirements,maintainorrepair
theproductfollowingthewarninglabelsinsidetheproduct.
Toavoidtheriskofelectricshock,donotperformanyothermaintenanceopera-
tionsbeyondthosedescribedinthismanual.Ifnecessary,contactSUNGROW for
maintenance.Otherwise,thelossescausedarenotcoveredbythewarranty.
Ifworkiscarriedoutwhilethedeviceislive,insulationprotectionisnecessary
andatleasttwopersonnelshouldbepresentatthesiteatthesametime.
ThePVplantswheretheinverterislocatedareusuallylocatedinoff-cityfields,
andappropriatefieldrescuefacilitiesshouldbepreparedforuseinneed.
SystemManual 2SafetyInstructions
Thedevicesinsidetheinvertercarryhighvoltage.Touchingthesedevicesmay
leadtofatalelectricshock.
•Livelinemeasurementcanonlybeperformedbyprofessionalpersonnelwho
knowthePVsystemwell.Beforemeasurement,besuretotakeproperprotec-
tionmethods(e.g.,wearinsulatinggloves,etc.);
•Duringlivelinemeasurement,theoperatormustbeaccompaniedbyothersto
ensurepersonalsafety.
Electricshockorfiremayoccurduetodevicedamageorsystemfault.
•Visuallyinspectfordevicedamagesorotherhazardsbeforetheoperation
•Checkwhetherotherexternaldevicesorcircuitconnectionsareinasafestate.
•Makesurethedeviceisinasafestatebeforeoperating.
Ifsomedevicesneedtobereplacedduringoperationandmaintenance,please
contactSUNGROW.
Waitatleast20minutesaftertheproductstopsrunningandensurethatthevol-
tagehasdroppedtowithinthesafevoltagerange,thelow-voltagecabinetiscon-
nectedwiththegroundingcable,thetransferswitch,ifany,isinthegrounding
position,thegroundingswitch,ifany,isclosed,andtheloadswitch,ifany,isopen.
Afterconfirmingthatallinspectionitemsmeettherequirements,maintainorrepair
theproductfollowingthewarninglabelsinsidetheproduct.
Toavoidtheriskofelectricshock,donotperformanyothermaintenanceopera-
tionsbeyondthosedescribedinthismanual.Ifnecessary,contactSUNGROW for
maintenance.Otherwise,thelossescausedarenotcoveredbythewarranty.
Ifworkiscarriedoutwhilethedeviceislive,insulationprotectionisnecessary
andatleasttwopersonnelshouldbepresentatthesiteatthesametime.
ThePVplantswheretheinverterislocatedareusuallylocatedinoff-cityfields,
andappropriatefieldrescuefacilitiesshouldbepreparedforuseinneed.
SystemManual 2SafetyInstructions
8
Topreventmisuseoraccidentscausedbyunrelatedpersonnel,postprominent
warningsignsordemarcatesafetywarningareasaroundthedevicetopreventac-
cidentscausedbymisuse.
2.6Disposal
Pleasescraptheinverterinaccordancewithrelevantlocalregulationsandstan-
dardstoavoidpropertylossesorcasualties.
2SafetyInstructions SystemManual
Topreventmisuseoraccidentscausedbyunrelatedpersonnel,postprominent
warningsignsordemarcatesafetywarningareasaroundthedevicetopreventac-
cidentscausedbymisuse.
2.6Disposal
Pleasescraptheinverterinaccordancewithrelevantlocalregulationsandstan-
dardstoavoidpropertylossesorcasualties.
2SafetyInstructions SystemManual
9
3ProductDescription
3.1ProductIntroduction
Inlargeandmedium-sizedutilitypowerplantsystems,theMVgrid-connectedinverter,
whichcontainsmultiplePVinverterunits,transformers,andotherequipment,providesa
soundsolutiontoconverttheDCpowergeneratedbyPVarraysintoACpower,andfeedit
intothegrid.
DC AC
No. Name Description
A PVarray
Monocrystallinesilicon,polycrystallinesilicon,andthin
filmwithoutgrounding.
B PVS CombinethecurrentofmultiplePVstringsandoutput.
C
MVgrid-connected
inverter
IncludeinverterunitsthatconverttheDCpowerfrom
thePVarraysintoACpower.
Includeatransformerthatconvertsthelow-voltageAC
poweroutputbyinverterunitsintomedium-voltageAC
power.
D Grid -
3.2ProductComposition
SG4400UD-MVistakenasanexampletointroducemaindevicesinsidetheMVgrid-con-
nectedinverter,Theproductconsistsof4inverterunits.
3ProductDescription
3.1ProductIntroduction
Inlargeandmedium-sizedutilitypowerplantsystems,theMVgrid-connectedinverter,
whichcontainsmultiplePVinverterunits,transformers,andotherequipment,providesa
soundsolutiontoconverttheDCpowergeneratedbyPVarraysintoACpower,andfeedit
intothegrid.
DC AC
No. Name Description
A PVarray
Monocrystallinesilicon,polycrystallinesilicon,andthin
filmwithoutgrounding.
B PVS CombinethecurrentofmultiplePVstringsandoutput.
C
MVgrid-connected
inverter
IncludeinverterunitsthatconverttheDCpowerfrom
thePVarraysintoACpower.
Includeatransformerthatconvertsthelow-voltageAC
poweroutputbyinverterunitsintomedium-voltageAC
power.
D Grid -
3.2ProductComposition
SG4400UD-MVistakenasanexampletointroducemaindevicesinsidetheMVgrid-con-
nectedinverter,Theproductconsistsof4inverterunits.
10
*Thefigureisforreferenceonly.Andtheactualproductreceivedshallprevail.
No. Name Description
A Inverterunits
ConverttheDCpowergeneratedbyPVmodules
intoACpower.
B Transformer
Convertthelow-voltageACpoweroutputbyinver-
terunitsintomedium-voltageACpower.
C Switchgear Connectingthegridtothetransformer.
D PowerdistributioncabinetForcommunicationandpowerdistribution.
3ProductDescription SystemManual
*Thefigureisforreferenceonly.Andtheactualproductreceivedshallprevail.
No. Name Description
A Inverterunits
ConverttheDCpowergeneratedbyPVmodules
intoACpower.
B Transformer
Convertthelow-voltageACpoweroutputbyinver-
terunitsintomedium-voltageACpower.
C Switchgear Connectingthegridtothetransformer.
D PowerdistributioncabinetForcommunicationandpowerdistribution.
3ProductDescription SystemManual
11
3.3MainInternalEquipment
3.3.1AppearanceofInverterUnit
No. Name
A Topairinlet
B Indicatorpanel
C Start/Stopknob
D Emergencystopbutton.Incaseofemergency,pressthisbuttontodiscon-
necttheelectricalconnectioninsidetheproduct.
E Base
LEDIndicator
table3-1IndicatorStatusDescription
Color Status Description
Blue
Steadyon Theinverterisingrid-connectedoperation.
Fastblinking(in-
terval:0.2s)
WiFiconnectionisestablishedanddatacommuni-
cationisinprocess.Nofaultisdetected.
Slowblinking(in-
terval:0.5s)
Theinverterisinadeepstandbystate.
Glowingandfad-
ing(interval:2s)
TheDCandACsidearepoweredon,ortheAC
sideispoweredon,theinverterisinastandbyoris
starting(notconnectedtothegrid).
SystemManual 3ProductDescription
3.3MainInternalEquipment
3.3.1AppearanceofInverterUnit
No. Name
A Topairinlet
B Indicatorpanel
C Start/Stopknob
D Emergencystopbutton.Incaseofemergency,pressthisbuttontodiscon-
necttheelectricalconnectioninsidetheproduct.
E Base
LEDIndicator
table3-1IndicatorStatusDescription
Color Status Description
Blue
Steadyon Theinverterisingrid-connectedoperation.
Fastblinking(in-
terval:0.2s)
WiFiconnectionisestablishedanddatacommuni-
cationisinprocess.Nofaultisdetected.
Slowblinking(in-
terval:0.5s)
Theinverterisinadeepstandbystate.
Glowingandfad-
ing(interval:2s)
TheDCandACsidearepoweredon,ortheAC
sideispoweredon,theinverterisinastandbyoris
starting(notconnectedtothegrid).
SystemManual 3ProductDescription
12
Color Status Description
Red
Steadyon
Afaultoccurredandthesystemcannotbecon-
nectedtothegridforpowergeneration.
Blinking(Interval
0.2s)
WiFiconnectionisestablishedanddatacommuni-
cationisinprocess.Afaultisdetected.
Grey
Off TheACandDCpoweraredisconnected.
VoltagemaystillbepresentinACsidecircuitsaftertheindicatorisoff.Payatten-
tiontotheelectricalsafetyduringoperating.
3.3.2InternalStructureofInverterUnit
OpenthefrontdooroftheinverterunitcabinettoseetheDCcabinet,asshownintheleftfig-
urebelow.OpenthebackdooroftheinverterunitcabinettoseetheACcabinet,asshown
intherightfigurebelow.
*Thefigureisforreferenceonly.Andtheactualproductreceivedshallprevail.
No. Name Description
A MaintenanceswitchQS2Disconnectitbeforemaintenanceandrepair.
B DCloadswitchQS1
Controltheon/offoftheDCsidecircuitsofthe
inverter.
3ProductDescription SystemManual
Color Status Description
Red
Steadyon
Afaultoccurredandthesystemcannotbecon-
nectedtothegridforpowergeneration.
Blinking(Interval
0.2s)
WiFiconnectionisestablishedanddatacommuni-
cationisinprocess.Afaultisdetected.
Grey
Off TheACandDCpoweraredisconnected.
VoltagemaystillbepresentinACsidecircuitsaftertheindicatorisoff.Payatten-
tiontotheelectricalsafetyduringoperating.
3.3.2InternalStructureofInverterUnit
OpenthefrontdooroftheinverterunitcabinettoseetheDCcabinet,asshownintheleftfig-
urebelow.OpenthebackdooroftheinverterunitcabinettoseetheACcabinet,asshown
intherightfigurebelow.
*Thefigureisforreferenceonly.Andtheactualproductreceivedshallprevail.
No. Name Description
A MaintenanceswitchQS2Disconnectitbeforemaintenanceandrepair.
B DCloadswitchQS1
Controltheon/offoftheDCsidecircuitsofthe
inverter.
3ProductDescription SystemManual
13
No. Name Description
C DCfuse -
D DCwiringcopperbar -
E FuseofACsideSPD -
F ACcircuitbreakerQF1
Controltheon/offoftheACsidecircuitsofthe
inverter.
MaintenanceswitchQS2couldalsobelocatedatthebottomleftcorneroftheAC
side.Therealproductmaydiffer.
3.3.3MainPartsofTransformer
Thetransformerisequippedwithmultipleprotectivedevicessuchastheoiltemperature
gauge,thepressuregauge,andtheoillevelgauge.
Graphics Name Description
Oillevelgauge Indicatethelevelofstoredoilinthetransformer.
De-energizedtap-
changer
Adjusttheoutputvoltageofthetransformer.
Drainvalveand
samplingvalve
Draintheoilfromthetransformerintoacontainer
throughacleanhose.
Winding
thermometer
Toobtainthetemperatureofthewinding.Thealarm
temperatureissettobe105℃
a)
Thetrippingtem-
peratureissettobe120℃
b)
SystemManual 3ProductDescription
No. Name Description
C DCfuse -
D DCwiringcopperbar -
E FuseofACsideSPD -
F ACcircuitbreakerQF1
Controltheon/offoftheACsidecircuitsofthe
inverter.
MaintenanceswitchQS2couldalsobelocatedatthebottomleftcorneroftheAC
side.Therealproductmaydiffer.
3.3.3MainPartsofTransformer
Thetransformerisequippedwithmultipleprotectivedevicessuchastheoiltemperature
gauge,thepressuregauge,andtheoillevelgauge.
Graphics Name Description
Oillevelgauge Indicatethelevelofstoredoilinthetransformer.
De-energizedtap-
changer
Adjusttheoutputvoltageofthetransformer.
Drainvalveand
samplingvalve
Draintheoilfromthetransformerintoacontainer
throughacleanhose.
Winding
thermometer
Toobtainthetemperatureofthewinding.Thealarm
temperatureissettobe105℃
a)
Thetrippingtem-
peratureissettobe120℃
b)
SystemManual 3ProductDescription
14
Graphics Name Description
Automaticpres-
surereliefvalve
Whenafaultoccursinsidethetransformer,alarge
amountofgasisgenerated,andthepressureof
theinsulatingoilrisessharply.Thisvalveautomati-
callyopenstodraintheoilwhenthepressure
reachesthethreshold,sothattheinternalpressure
ofthetransformercanberapidlyreducedtoanor-
malvalue.Andasignalissenttotripthecircuit
breaker.
Oiltemperature
gauge
Thealarmthresholdis95℃.Analarmsignalis
sentiftheoiltemperaturereaches95℃.
Thetrippingthresholdis100℃.Atrippingsignalis
sentiftheoiltemperaturereaches100℃.
Gasrelay
Whenafaultoccursinthetransformer,theoilinthe
oiltankwillbedecomposedtogenerategas,and
thegaswillriseandenterthegasrelay.
•Incasethegasgeneratedislight,thealarmsig-
nalcontactwillbeconnected,andalarmsignal
willbesentout.
•Incasethegasgeneratedisheavy,thetripping
signalcontactwillbeconnected,andthecircuit
breakerintheswitchgeartrips,sothatthetrans-
formerwillbedisconnectedfromthegridto
avoiddevicedamage.
3.3.4MainPartsofPowerDistributionCabinet
Thepowerdistributioncabinetisusedforcommunicationandpowerdistribution.
3ProductDescription SystemManual
Graphics Name Description
Automaticpres-
surereliefvalve
Whenafaultoccursinsidethetransformer,alarge
amountofgasisgenerated,andthepressureof
theinsulatingoilrisessharply.Thisvalveautomati-
callyopenstodraintheoilwhenthepressure
reachesthethreshold,sothattheinternalpressure
ofthetransformercanberapidlyreducedtoanor-
malvalue.Andasignalissenttotripthecircuit
breaker.
Oiltemperature
gauge
Thealarmthresholdis95℃.Analarmsignalis
sentiftheoiltemperaturereaches95℃.
Thetrippingthresholdis100℃.Atrippingsignalis
sentiftheoiltemperaturereaches100℃.
Gasrelay
Whenafaultoccursinthetransformer,theoilinthe
oiltankwillbedecomposedtogenerategas,and
thegaswillriseandenterthegasrelay.
•Incasethegasgeneratedislight,thealarmsig-
nalcontactwillbeconnected,andalarmsignal
willbesentout.
•Incasethegasgeneratedisheavy,thetripping
signalcontactwillbeconnected,andthecircuit
breakerintheswitchgeartrips,sothatthetrans-
formerwillbedisconnectedfromthegridto
avoiddevicedamage.
3.3.4MainPartsofPowerDistributionCabinet
Thepowerdistributioncabinetisusedforcommunicationandpowerdistribution.
3ProductDescription SystemManual
15
figure3-1MainPartsof5KPowerDistributionCabinet
No. Description
A Switchport
B Ethernetport
C QS4,mainswitch
D Wiringterminalblockandmicrocircuitbreaker
figure3-2MainPartsof15KPowerDistributionCabinet
No. Description
A Switchport
B Ethernetport
C QS4,mainswitch
D Wiringterminalblockandmicrocircuitbreaker
SystemManual 3ProductDescription
figure3-1MainPartsof5KPowerDistributionCabinet
No. Description
A Switchport
B Ethernetport
C QS4,mainswitch
D Wiringterminalblockandmicrocircuitbreaker
figure3-2MainPartsof15KPowerDistributionCabinet
No. Description
A Switchport
B Ethernetport
C QS4,mainswitch
D Wiringterminalblockandmicrocircuitbreaker
SystemManual 3ProductDescription
16
*Thefigureisforreferenceonly.Theproductreceivedmaydiffer.
PleaseadoptEthernetorswitchcommunicationaccordingtotheactualsituation
onsite.
3.4SymbolonProducts
Marks Explanation
ComplywithCEcertification.
Highvoltageinside!Riskofelectricshockbytouchingit!
Thetemperaturehereisbeyondtheacceptablerangeforthehu-
manbody,pleasedonottouchitarbitrarilytoavoidpersonal
injury.
Firmlygroundtheprotectivegroundterminaltoensurethesafety
ofoperators.
Theinvertercanonlybemaintainedandoverhauledafterbeing
poweredofffor20minutes.
Itisrecommendedtowearnoise-cancellationearplugssincethe
productmaygeneratenoiseduringoperation.
Itisstrictlyforbiddentotouchthefanbladeswhenthefanis
rotating.
Readthismanualcarefullybeforeanyoperationontheproduct.
Donotdisposeofthisproductashouseholdwaste.
3ProductDescription SystemManual
*Thefigureisforreferenceonly.Theproductreceivedmaydiffer.
PleaseadoptEthernetorswitchcommunicationaccordingtotheactualsituation
onsite.
3.4SymbolonProducts
Marks Explanation
ComplywithCEcertification.
Highvoltageinside!Riskofelectricshockbytouchingit!
Thetemperaturehereisbeyondtheacceptablerangeforthehu-
manbody,pleasedonottouchitarbitrarilytoavoidpersonal
injury.
Firmlygroundtheprotectivegroundterminaltoensurethesafety
ofoperators.
Theinvertercanonlybemaintainedandoverhauledafterbeing
poweredofffor20minutes.
Itisrecommendedtowearnoise-cancellationearplugssincethe
productmaygeneratenoiseduringoperation.
Itisstrictlyforbiddentotouchthefanbladeswhenthefanis
rotating.
Readthismanualcarefullybeforeanyoperationontheproduct.
Donotdisposeofthisproductashouseholdwaste.
3ProductDescription SystemManual
17
4TransportandStorage
4.1Precautions
Failuretotransportandstoretheproductinaccordancewiththerequirementsin
thismanualmayinvalidatethewarranty.
4.2TransportationRequirements
•Chooseappropriatemeansoftransportationaccordingtothesizeandweightofthe
product.
•Placetheproducthorizontallyduringtransportation.
•Avoidcollisionorstrongshockduringtransportation.
•Transporttheproductinaccordancewithrelevantlocalregulationsandstandards.
•Wearproperpersonalprotectiveequipmentwhenoperatingtheproduct.
4.3StorageRequirements
•Storetheproductindoors,forexample,largewarehouseorworkshop,topreventpossi-
blecondensationoritsbottomfrombeingsoakedbyrainwaterintherainyseason.
•Iftheproductmustbestoredoutdoorsduetositeconditions,theproductbasemustbe
raised.Thespecificheightshouldbereasonablydeterminedbasedonsitegeological
andmeteorologicalconditions.
•Donotstoretheinverterinplacessusceptibletodirectsunlight,rain,andstrongelectric
field.
•Storetheproductonadry,flat,andstablegroundwithsufficientcarryingcapacityand
withoutanyvegetationcover.Thegroundmustbeflatanddry.
•Beforestorage,ensurethatthedoorsoftheproductandallinternalequipmentare
locked.
•Thestoragetemperatureshouldbebetween-40℃and+70℃,andtherelativehumidity
shouldbebetween0and95%withoutcondensation.
•Theairinletandoutletoftheproductshouldbeeffectivelyprotected,andeffectivemea-
suresshouldbetakentopreventrainwater,sand,anddustfrompenetratingtheproduct.
•Carryoutperiodicinspections.Checktheproductandtheinnerequipmentfordamage
atleasteveryhalfamonth.
4TransportandStorage
4.1Precautions
Failuretotransportandstoretheproductinaccordancewiththerequirementsin
thismanualmayinvalidatethewarranty.
4.2TransportationRequirements
•Chooseappropriatemeansoftransportationaccordingtothesizeandweightofthe
product.
•Placetheproducthorizontallyduringtransportation.
•Avoidcollisionorstrongshockduringtransportation.
•Transporttheproductinaccordancewithrelevantlocalregulationsandstandards.
•Wearproperpersonalprotectiveequipmentwhenoperatingtheproduct.
4.3StorageRequirements
•Storetheproductindoors,forexample,largewarehouseorworkshop,topreventpossi-
blecondensationoritsbottomfrombeingsoakedbyrainwaterintherainyseason.
•Iftheproductmustbestoredoutdoorsduetositeconditions,theproductbasemustbe
raised.Thespecificheightshouldbereasonablydeterminedbasedonsitegeological
andmeteorologicalconditions.
•Donotstoretheinverterinplacessusceptibletodirectsunlight,rain,andstrongelectric
field.
•Storetheproductonadry,flat,andstablegroundwithsufficientcarryingcapacityand
withoutanyvegetationcover.Thegroundmustbeflatanddry.
•Beforestorage,ensurethatthedoorsoftheproductandallinternalequipmentare
locked.
•Thestoragetemperatureshouldbebetween-40℃and+70℃,andtherelativehumidity
shouldbebetween0and95%withoutcondensation.
•Theairinletandoutletoftheproductshouldbeeffectivelyprotected,andeffectivemea-
suresshouldbetakentopreventrainwater,sand,anddustfrompenetratingtheproduct.
•Carryoutperiodicinspections.Checktheproductandtheinnerequipmentfordamage
atleasteveryhalfamonth.
18
•Avoidstorageformorethanthreemonths.Iftheproductisstoredfortoolong,besureto
takestrictprotectivemeasuresandcarryoutthenecessaryinspection.Opentheproduct
doorfirsttovisuallychecktheproductandinternalequipmentfordamage.Iftheproduct
isstoredformorethanayear,checkitafteritispoweredonandstarts.Ifnecessary,re-
questprofessionalsfortestingbeforeinstallation.
4TransportandStorage SystemManual
•Avoidstorageformorethanthreemonths.Iftheproductisstoredfortoolong,besureto
takestrictprotectivemeasuresandcarryoutthenecessaryinspection.Opentheproduct
doorfirsttovisuallychecktheproductandinternalequipmentfordamage.Iftheproduct
isstoredformorethanayear,checkitafteritispoweredonandstarts.Ifnecessary,re-
questprofessionalsfortestingbeforeinstallation.
4TransportandStorage SystemManual
19
5MechanicalMounting
Respectalllocalstandardsandrequirementsduringmechanicalinstallation.
5.1SafetyPrecautions
Onlyinstalltheproductwhenitiscompleteandintact.
Beforeinstallation,ensurethattheproductandallinternalequipmentareintact,
withoutanydamage.
Riskofpersonalinjuryordevicedamageduetoincorrectoperation!
•FollowtheprocedureofworkofheightswhenwalkingonthetopoftheMV
grid-connectedinverter.
•Allhoistingandtransportationmustcomplywiththerelevantcodesandregula-
tionsofthenation/regionwheretheprojectislocated.
•Ifanytoolisusedforunpacking,becarefulnottodamagetheproduct.
•Afterreceivingtheproduct,checkwhethertheappearanceandstructuralparts
oftheproductaredamaged,whetherthetransformerleakedoil,andwhether
thepackinglistisconsistentwiththeactualorderedproduct.Iftherearepro-
blemswiththeaboveinspectionitems,donotinstalltheproductandcontact
SUNGROW intime.
5MechanicalMounting
Respectalllocalstandardsandrequirementsduringmechanicalinstallation.
5.1SafetyPrecautions
Onlyinstalltheproductwhenitiscompleteandintact.
Beforeinstallation,ensurethattheproductandallinternalequipmentareintact,
withoutanydamage.
Riskofpersonalinjuryordevicedamageduetoincorrectoperation!
•FollowtheprocedureofworkofheightswhenwalkingonthetopoftheMV
grid-connectedinverter.
•Allhoistingandtransportationmustcomplywiththerelevantcodesandregula-
tionsofthenation/regionwheretheprojectislocated.
•Ifanytoolisusedforunpacking,becarefulnottodamagetheproduct.
•Afterreceivingtheproduct,checkwhethertheappearanceandstructuralparts
oftheproductaredamaged,whetherthetransformerleakedoil,andwhether
thepackinglistisconsistentwiththeactualorderedproduct.Iftherearepro-
blemswiththeaboveinspectionitems,donotinstalltheproductandcontact
SUNGROW intime.
20
Improperhoistingmaycausepersonalinjury!
•Itisstrictlyprohibitedtostandwithin5m-10moutsidetheoperatingarea(i.e.,
undertheboomandthehoistedmachine)toavoidcasualties.
•Onlyprofessionalpersonnelcanoperatetheproduct,andbesuretowearper-
sonalprotectiveequipmentwhenoperating.
•Stophoistingintheeventofsevereweather,suchasheavyrain,thickfog,or
strongwind.
•Besuretohoisttheproductsmoothlyandevenlytoavoidcollisionandvibra-
tion.Donotturntheproductupsidedown,norhoistitforalongtime.
•Whenhoistingandmovingtheproduct,beawareofitssizeandweightand
keepthebalancetopreventitfromturningoverorfalling.
5.2InspectionBeforeInstallation
5.2.1ScopeofDelivery
Accessoriesdeliveredwiththeproductarelistedbelow:
figure5-1ScopeofDelivery
No. Name
A Relevantdocuments(thecertificateofquality,warrantycard,deliveryin-
spectionreport,etc.)
B Key
C M16x45bolt
D M16flatwasher
E M16springwasher
F M16nut
5MechanicalMounting SystemManual
Improperhoistingmaycausepersonalinjury!
•Itisstrictlyprohibitedtostandwithin5m-10moutsidetheoperatingarea(i.e.,
undertheboomandthehoistedmachine)toavoidcasualties.
•Onlyprofessionalpersonnelcanoperatetheproduct,andbesuretowearper-
sonalprotectiveequipmentwhenoperating.
•Stophoistingintheeventofsevereweather,suchasheavyrain,thickfog,or
strongwind.
•Besuretohoisttheproductsmoothlyandevenlytoavoidcollisionandvibra-
tion.Donotturntheproductupsidedown,norhoistitforalongtime.
•Whenhoistingandmovingtheproduct,beawareofitssizeandweightand
keepthebalancetopreventitfromturningoverorfalling.
5.2InspectionBeforeInstallation
5.2.1ScopeofDelivery
Accessoriesdeliveredwiththeproductarelistedbelow:
figure5-1ScopeofDelivery
No. Name
A Relevantdocuments(thecertificateofquality,warrantycard,deliveryin-
spectionreport,etc.)
B Key
C M16x45bolt
D M16flatwasher
E M16springwasher
F M16nut
5MechanicalMounting SystemManual
21
Theaccessoriesshowninabovefiguresareforreferenceonly.Theproductre-
ceivedmaydiffer.
5.2.2ProductInspection
•Checkwhethertheproductreceivedistheorderedone.
•Checkthatthescopeofdeliveryisconsistentwiththecontractagainstthepackinglist.
•Visuallychecktheproductforanydamage.
Ifanyproblemsarefoundorthereisanyquestion,pleasecontacttheforwardingcompany
orSUNGROW.
Onlyinstalltheproductwhenitiscompleteandintact.
Beforeinstallation,ensurethat:
•Theproductisingoodcondition,withoutanydamage.
•Theproductandallinternalequipmentareintact,withoutanydamage.
5.3InstallationEnvironmentRequirements
5.3.1InstallationSite
•Theclimateenvironmentandgeologicalconditions,suchasstresswaveemissionand
undergroundwaterlevel,shouldbefullyconsideredwhenselectingtheinstallationsite.
•Theinstallationsiteshouldbedryandwellventilated.
•Thereshouldbenotreesaroundtheinstallationsitetopreventbranchesorleavesblown
offbyheavywindsfromblockingthedoororairinlet.
•Theinstallationsiteshouldbeawayfromareaswheretoxicandharmfulgasesarecon-
centrated,andfreefrominflammable,explosive,andcorrosivematerials.
•Theinstallationsiteshouldbefarawayfromresidentialareastoavoidnoise.
5.3.2Foundation
•Thesoilattheinstallationsiteshouldbecompact.Itisrecommendedthattherelative
densityofsoilattheinstallationsitebenolessthan98%.Takerelevantmeasurestoen-
sureastablefoundationincaseofloosesoil.
•Thefoundationpitmustbecompactedandfilledtoprovidesufficientandeffectivesup-
portfortheproduct.
•Thefoundationshouldbehigherthanthehorizontalgroundtopreventtheproductbase
andtheinteriorfromrainerosion.
•Thecross-sectionalareaandheightofthefoundationshouldmeettherequirements.
•Cablingshouldbeconsideredwhenbuildingthefoundation.
SystemManual 5MechanicalMounting
Theaccessoriesshowninabovefiguresareforreferenceonly.Theproductre-
ceivedmaydiffer.
5.2.2ProductInspection
•Checkwhethertheproductreceivedistheorderedone.
•Checkthatthescopeofdeliveryisconsistentwiththecontractagainstthepackinglist.
•Visuallychecktheproductforanydamage.
Ifanyproblemsarefoundorthereisanyquestion,pleasecontacttheforwardingcompany
orSUNGROW.
Onlyinstalltheproductwhenitiscompleteandintact.
Beforeinstallation,ensurethat:
•Theproductisingoodcondition,withoutanydamage.
•Theproductandallinternalequipmentareintact,withoutanydamage.
5.3InstallationEnvironmentRequirements
5.3.1InstallationSite
•Theclimateenvironmentandgeologicalconditions,suchasstresswaveemissionand
undergroundwaterlevel,shouldbefullyconsideredwhenselectingtheinstallationsite.
•Theinstallationsiteshouldbedryandwellventilated.
•Thereshouldbenotreesaroundtheinstallationsitetopreventbranchesorleavesblown
offbyheavywindsfromblockingthedoororairinlet.
•Theinstallationsiteshouldbeawayfromareaswheretoxicandharmfulgasesarecon-
centrated,andfreefrominflammable,explosive,andcorrosivematerials.
•Theinstallationsiteshouldbefarawayfromresidentialareastoavoidnoise.
5.3.2Foundation
•Thesoilattheinstallationsiteshouldbecompact.Itisrecommendedthattherelative
densityofsoilattheinstallationsitebenolessthan98%.Takerelevantmeasurestoen-
sureastablefoundationincaseofloosesoil.
•Thefoundationpitmustbecompactedandfilledtoprovidesufficientandeffectivesup-
portfortheproduct.
•Thefoundationshouldbehigherthanthehorizontalgroundtopreventtheproductbase
andtheinteriorfromrainerosion.
•Thecross-sectionalareaandheightofthefoundationshouldmeettherequirements.
•Cablingshouldbeconsideredwhenbuildingthefoundation.
SystemManual 5MechanicalMounting
22
•Pre-burythethreadingpipeatthebottomofthefoundationaccordingtothelocationof
thecableinletholesatthebottomoftheproduct.
•Adrainagesystemisnecessarytopreventthebottomorinternalequipmentofthepro-
ductfrombeingsoakedinwaterduringtherainyseasonorduringheavyrainfall.
•Thedregsexcavatedduringfoundationconstructionshouldberemovedimmediatelyto
avoidthelatterimpactonhoisting.
•Pre-burythechannelsteel.
5.3.3InstallationSpacing
Toensurebetterheatdissipationandfacilitatelatermaintenance,reserveenoughspace
aroundtheinstallationsite.
5.4HoistingandFixing
5.4.1PreparationBeforeHoisting
Professionalcranesmustbeusedandmustbeoperatedbyqualifiedpersonnel.
Otherwise,personalinjuryorproductdamagemayoccur!
•Improperhoistingmaycausepersonalinjury!
•Itisstrictlyprohibitedtostandwithin5m-10moutsidetheoperatingarea(i.e.,
undertheboomandthehoistedmachine)toavoidcasualties.
•Professionalcranesmustbeusedandmustbeoperatedbyprofessional
personnel.
•Stophoistingintheeventofsevereweather,suchasheavyrain,thickfog,or
strongwind.
5MechanicalMounting SystemManual
•Pre-burythethreadingpipeatthebottomofthefoundationaccordingtothelocationof
thecableinletholesatthebottomoftheproduct.
•Adrainagesystemisnecessarytopreventthebottomorinternalequipmentofthepro-
ductfrombeingsoakedinwaterduringtherainyseasonorduringheavyrainfall.
•Thedregsexcavatedduringfoundationconstructionshouldberemovedimmediatelyto
avoidthelatterimpactonhoisting.
•Pre-burythechannelsteel.
5.3.3InstallationSpacing
Toensurebetterheatdissipationandfacilitatelatermaintenance,reserveenoughspace
aroundtheinstallationsite.
5.4HoistingandFixing
5.4.1PreparationBeforeHoisting
Professionalcranesmustbeusedandmustbeoperatedbyqualifiedpersonnel.
Otherwise,personalinjuryorproductdamagemayoccur!
•Improperhoistingmaycausepersonalinjury!
•Itisstrictlyprohibitedtostandwithin5m-10moutsidetheoperatingarea(i.e.,
undertheboomandthehoistedmachine)toavoidcasualties.
•Professionalcranesmustbeusedandmustbeoperatedbyprofessional
personnel.
•Stophoistingintheeventofsevereweather,suchasheavyrain,thickfog,or
strongwind.
5MechanicalMounting SystemManual
23
5.4.2Requirementsforhoistandliftingrope
Cranes Requirement
Ratedload 50t
LiftingRopes
Fourliftingropesofequallength,thelengthofasinglerope
isnotlessthan6.5m.
Theloadthatasingleropecanbearisnotlessthan7t.
5.4.3DuringHoisting
•Ensuresafeandreliableconnectionsofallslings.
•Ensurethattheproductissteadyandnottiltingduringthewholehoistingprocess.
•Theproductshouldbehoistedvertically.Neverdragtheproductonthegroundorthetop
ofthelowerproduct,andneverpullandpushitonanysurface.
•Suspendthehoistingwhentheproductishoisted300mmfromthesupportingsurfaceto
checktheconnectionbetweenslingsandtheproduct.Continuehoistingonlyaftercon-
firmingareliableconnection.
•Whentheproductisinplace,placeitlightlyandsmoothly.Itisstrictlyforbiddentothrow
ittoplacesoutsidetheverticallandingplace.
•Theoutdoorcabinetshouldbeplacedonasolidandflatsitewithgooddrainageandno
obstaclesorprotrusions.
•Avoidscratchingtheproductduringhoisting.
SystemManual 5MechanicalMounting
5.4.2Requirementsforhoistandliftingrope
Cranes Requirement
Ratedload 50t
LiftingRopes
Fourliftingropesofequallength,thelengthofasinglerope
isnotlessthan6.5m.
Theloadthatasingleropecanbearisnotlessthan7t.
5.4.3DuringHoisting
•Ensuresafeandreliableconnectionsofallslings.
•Ensurethattheproductissteadyandnottiltingduringthewholehoistingprocess.
•Theproductshouldbehoistedvertically.Neverdragtheproductonthegroundorthetop
ofthelowerproduct,andneverpullandpushitonanysurface.
•Suspendthehoistingwhentheproductishoisted300mmfromthesupportingsurfaceto
checktheconnectionbetweenslingsandtheproduct.Continuehoistingonlyaftercon-
firmingareliableconnection.
•Whentheproductisinplace,placeitlightlyandsmoothly.Itisstrictlyforbiddentothrow
ittoplacesoutsidetheverticallandingplace.
•Theoutdoorcabinetshouldbeplacedonasolidandflatsitewithgooddrainageandno
obstaclesorprotrusions.
•Avoidscratchingtheproductduringhoisting.
SystemManual 5MechanicalMounting
24
figure5-2SG4400UD-MVHoistingDiagram
Besuretohoisttheproductsmoothlyandevenlytoavoidcollisionandvibration.
Donotturntheproductupsidedown,norhoistitforalongtime.Otherwise,perso-
nalinjuryorproductdamagemayoccur!
5.4.4FasteningofConnectors
UseslingswithhooksorU-hookstohoisttheMVStation.
TheliftingdevicesshouldbeconnectedcorrectlytotheMVStation.
5MechanicalMounting SystemManual
figure5-2SG4400UD-MVHoistingDiagram
Besuretohoisttheproductsmoothlyandevenlytoavoidcollisionandvibration.
Donotturntheproductupsidedown,norhoistitforalongtime.Otherwise,perso-
nalinjuryorproductdamagemayoccur!
5.4.4FasteningofConnectors
UseslingswithhooksorU-hookstohoisttheMVStation.
TheliftingdevicesshouldbeconnectedcorrectlytotheMVStation.
5MechanicalMounting SystemManual
25
Liftingdevice Hook U-hook
Connections
Notice
Insertthehookfrominside
tooutside.
LateralpinoftheU-hook
shouldbetightened.
•Nationalandlocalsafetyrulesshouldbeobservedatalltimes.
•Regardlessofrelevantsafetyrulesmayvoidpertinentwarrantyclaimsfrom
Sungrow.
5.4.5Fixing
Hoisttheproducttotheintendedlocationandfixit.
FixedbyWelding
Securethebottomoftheproducttothefoundationbywelding.Takepropermeasurestopre-
venttheweldingpointfromcorrosionafterwelding.
FixingbyLmountingparts
Fixthefixingpointatthebottomoftheinverter(shownasAbelow)withtheexistingoperat-
ingplatformusingLmountingparts.
SystemManual 5MechanicalMounting
Liftingdevice Hook U-hook
Connections
Notice
Insertthehookfrominside
tooutside.
LateralpinoftheU-hook
shouldbetightened.
•Nationalandlocalsafetyrulesshouldbeobservedatalltimes.
•Regardlessofrelevantsafetyrulesmayvoidpertinentwarrantyclaimsfrom
Sungrow.
5.4.5Fixing
Hoisttheproducttotheintendedlocationandfixit.
FixedbyWelding
Securethebottomoftheproducttothefoundationbywelding.Takepropermeasurestopre-
venttheweldingpointfromcorrosionafterwelding.
FixingbyLmountingparts
Fixthefixingpointatthebottomoftheinverter(shownasAbelow)withtheexistingoperat-
ingplatformusingLmountingparts.
SystemManual 5MechanicalMounting
26
ThestepstofixingtheLmountingpartsisshowninthefollowingfigure.
5MechanicalMounting SystemManual
ThestepstofixingtheLmountingpartsisshowninthefollowingfigure.
5MechanicalMounting SystemManual
27
6ElectricalConnection
6.1Precautions
•Beforeelectricalconnections,pleasemakesurethattheinverterisnotda-
maged,otherwise,itmaycausedanger!
•Beforeelectricalconnections,pleasemakesurethattheproductswitchandall
switchesconnectedtotheproductaresetto"OFF",andusemeasuringequip-
menttoensurethatthereisnovoltageattheconnection.Otherwise,anelectric
shockmayoccur!
•Allswitchescannotbecloseduntiltheelectricalconnectioniscompleted.
PVmoduleswillgeneratelethalhighvoltagewhenexposedtosunlight.
•Operatorsmustwearproperpersonalprotectiveequipmentduringelectrical
connections.
•Beforeperforminganelectricalconnection,besuretodisconnectthePVSand
usemeasuringequipmenttoensurethatcablesarevoltage-free.
•RespecttheprotectionrequirementsandprecautionsofPVmodules.
Dangertolifeduetoahighvoltageinsidetheinverter!
•Besuretousespecialinsulationtoolsduringcableconnections.
•Noteandobservethewarningsontheproduct.
•Respectallsafetyprecautionslistedinthismanualandotherpertinent
documents.
Sandandmoisturepenetrationmaydamagetheelectricalequipmentinthepro-
duct,oraffecttheiroperatingperformance!
•Avoidelectricalconnectionsduringsandstormsorwhentherelativehumidity
inthesurroundingenvironmentisgreaterthan95%.
•Carryouttheelectricalconnectionoftheproductonfinedayswithnowindand
sand.
6ElectricalConnection
6.1Precautions
•Beforeelectricalconnections,pleasemakesurethattheinverterisnotda-
maged,otherwise,itmaycausedanger!
•Beforeelectricalconnections,pleasemakesurethattheproductswitchandall
switchesconnectedtotheproductaresetto"OFF",andusemeasuringequip-
menttoensurethatthereisnovoltageattheconnection.Otherwise,anelectric
shockmayoccur!
•Allswitchescannotbecloseduntiltheelectricalconnectioniscompleted.
PVmoduleswillgeneratelethalhighvoltagewhenexposedtosunlight.
•Operatorsmustwearproperpersonalprotectiveequipmentduringelectrical
connections.
•Beforeperforminganelectricalconnection,besuretodisconnectthePVSand
usemeasuringequipmenttoensurethatcablesarevoltage-free.
•RespecttheprotectionrequirementsandprecautionsofPVmodules.
Dangertolifeduetoahighvoltageinsidetheinverter!
•Besuretousespecialinsulationtoolsduringcableconnections.
•Noteandobservethewarningsontheproduct.
•Respectallsafetyprecautionslistedinthismanualandotherpertinent
documents.
Sandandmoisturepenetrationmaydamagetheelectricalequipmentinthepro-
duct,oraffecttheiroperatingperformance!
•Avoidelectricalconnectionsduringsandstormsorwhentherelativehumidity
inthesurroundingenvironmentisgreaterthan95%.
•Carryouttheelectricalconnectionoftheproductonfinedayswithnowindand
sand.
28
Damagetothedevicecausedbyincorrectwiringisnotcoveredbythewarranty.
•Electricalconnectionmustbeperformedbyprofessionalpersonnelwhowear
personalprotectiveequipment.
•ThecablesusedinthePVgenerationsystemmustbefirmlyconnected,ingood
condition,andwellinsulatedtoappropriatesizes.
•CheckandconfirmthepolaritycorrectnessofthePVstring,andthenconnectit
tothecorrespondingpositionofthisproduct.
•Wheninstallingandoperatingtheproduct,makesurethatthepositiveornega-
tivepolaritiesofPVstringsdonotshort-circuittotheground.Otherwise,anAC
orDCshort-circuitmayoccur,resultinginproductdamage.Thedamage
causedbythisisnotcoveredbythewarranty.
•ComplywiththesafetyinstructionsrelatedtoPVstringsandtheregulationsre-
latedtothelocalgrid.
•Duringelectricalconnection,donotforciblypullanywiresorcables,asthis
maycompromisetheinsulationperformance.
•Ensurethatallcablesandwireshavesufficientspaceforanybends.
•Adoptthenecessaryauxiliarymeasurestoreducethestressappliedtocables
andwires.
•Keepasufficientdistancebetweenthecableandtheheatingdevicetoavoid
aginganddamageoftheinsulationlayerofthecablecausedbyhigh
temperature.
Allelectricalconnectionsmustcomplywithlocalandnational/regionalelectrical
standards.
•Cablesusedbytheusershallcomplywiththerequirementsoflocallawsand
regulations.
•Onlywiththepermissionofthenational/regionalgriddepartment,theinverter
canbeconnectedtothegrid.
6.2WiringOverview
Powercable Communicationcable
6ElectricalConnection SystemManual
Damagetothedevicecausedbyincorrectwiringisnotcoveredbythewarranty.
•Electricalconnectionmustbeperformedbyprofessionalpersonnelwhowear
personalprotectiveequipment.
•ThecablesusedinthePVgenerationsystemmustbefirmlyconnected,ingood
condition,andwellinsulatedtoappropriatesizes.
•CheckandconfirmthepolaritycorrectnessofthePVstring,andthenconnectit
tothecorrespondingpositionofthisproduct.
•Wheninstallingandoperatingtheproduct,makesurethatthepositiveornega-
tivepolaritiesofPVstringsdonotshort-circuittotheground.Otherwise,anAC
orDCshort-circuitmayoccur,resultinginproductdamage.Thedamage
causedbythisisnotcoveredbythewarranty.
•ComplywiththesafetyinstructionsrelatedtoPVstringsandtheregulationsre-
latedtothelocalgrid.
•Duringelectricalconnection,donotforciblypullanywiresorcables,asthis
maycompromisetheinsulationperformance.
•Ensurethatallcablesandwireshavesufficientspaceforanybends.
•Adoptthenecessaryauxiliarymeasurestoreducethestressappliedtocables
andwires.
•Keepasufficientdistancebetweenthecableandtheheatingdevicetoavoid
aginganddamageoftheinsulationlayerofthecablecausedbyhigh
temperature.
Allelectricalconnectionsmustcomplywithlocalandnational/regionalelectrical
standards.
•Cablesusedbytheusershallcomplywiththerequirementsoflocallawsand
regulations.
•Onlywiththepermissionofthenational/regionalgriddepartment,theinverter
canbeconnectedtothegrid.
6.2WiringOverview
Powercable Communicationcable
6ElectricalConnection SystemManual
29
1-Inverter 2–Transformer 3–PowerDistributionCabinet
table6-1InterfaceDescription
No. Description RecommendedCableSpecifications
A DCinputport 400mm
2
atmost
B ACoutputport 70mm
2
—400mm
2
C Communicationport
2x0.75mm
2
—2x1.5mm
2
shieldedtwistedpair
cable
D
Externalpowersupply
port
—
E Grounding
60mmx100mmhot-dipgalvanizedflatsteel
50mm
2
—95mm
2
groundingcable
6.3PreparationBeforeWiring
6.3.1InstallationTools
Installationtoolsincludebutarenotlimitedtothefollowingrecommendedones.Useother
auxiliarytoolsonsiteasneeded.
SystemManual 6ElectricalConnection
1-Inverter 2–Transformer 3–PowerDistributionCabinet
table6-1InterfaceDescription
No. Description RecommendedCableSpecifications
A DCinputport 400mm
2
atmost
B ACoutputport 70mm
2
—400mm
2
C Communicationport
2x0.75mm
2
—2x1.5mm
2
shieldedtwistedpair
cable
D
Externalpowersupply
port
—
E Grounding
60mmx100mmhot-dipgalvanizedflatsteel
50mm
2
—95mm
2
groundingcable
6.3PreparationBeforeWiring
6.3.1InstallationTools
Installationtoolsincludebutarenotlimitedtothefollowingrecommendedones.Useother
auxiliarytoolsonsiteasneeded.
SystemManual 6ElectricalConnection
30
Torquescrewdriver
Wirestripper Hydraulicclamp
Heatgun
Multimeter
Screwdriver
Electricdrill
Torquewrench
Protectivegloves Goggles Insulatedshoes Protectiveclothing
Hardhat
6.3.2OpentheProductDoor
Step1Openthecabinetdoor.
Step2Fixthedoorsoftheinverterunitcabinetandpowerdistributioncabinet.
Step3Removetheprotectivecoverofthewiringarea.
6ElectricalConnection SystemManual
Torquescrewdriver
Wirestripper Hydraulicclamp
Heatgun
Multimeter
Screwdriver
Electricdrill
Torquewrench
Protectivegloves Goggles Insulatedshoes Protectiveclothing
Hardhat
6.3.2OpentheProductDoor
Step1Openthecabinetdoor.
Step2Fixthedoorsoftheinverterunitcabinetandpowerdistributioncabinet.
Step3Removetheprotectivecoverofthewiringarea.
6ElectricalConnection SystemManual
31
--End
6.3.3Cables
Thecablesmustmeetthefollowingrequirements:
•Thecurrentcarryingcapacityofthecableshouldmeettherequirements.Factorsaffect-
ingthecurrent-carryingcapacityofaconductorincludebutarenotlimitedto:
–Environmentalconditions
–Typeoftheinsulationmaterialoftheconductor
–Cablingmethod
–Materialandcross-sectionalareaofthecable
•Selectcableswithaproperdiameteraccordingtothemaximumload,andthecables
shouldbelongenough.
•AllDCinputcablesmustbeofthesamespecificationsandmaterials.
•ACoutputcablesofthreephasesmustbeofthesamespecificationsandmaterials.
•Onlyflame-retardantcablescanbeused.
Cablesusedshallcomplywiththerequirementsoflocallawsandregulations.
Thecablecolorsinfiguresinthismanualareforreferenceonly.Pleaseselect
cablesaccordingtolocalcablestandards.
6.3.4PositionofCableInlet
Foreasywiring,cablesbetweenexternaldevicesandtheproductareroutedintothepro-
ductthroughthebottomcableinlet.
*Thefigureisforreferenceonly.Theproductreceivedmaydiffer.
SystemManual 6ElectricalConnection
--End
6.3.3Cables
Thecablesmustmeetthefollowingrequirements:
•Thecurrentcarryingcapacityofthecableshouldmeettherequirements.Factorsaffect-
ingthecurrent-carryingcapacityofaconductorincludebutarenotlimitedto:
–Environmentalconditions
–Typeoftheinsulationmaterialoftheconductor
–Cablingmethod
–Materialandcross-sectionalareaofthecable
•Selectcableswithaproperdiameteraccordingtothemaximumload,andthecables
shouldbelongenough.
•AllDCinputcablesmustbeofthesamespecificationsandmaterials.
•ACoutputcablesofthreephasesmustbeofthesamespecificationsandmaterials.
•Onlyflame-retardantcablescanbeused.
Cablesusedshallcomplywiththerequirementsoflocallawsandregulations.
Thecablecolorsinfiguresinthismanualareforreferenceonly.Pleaseselect
cablesaccordingtolocalcablestandards.
6.3.4PositionofCableInlet
Foreasywiring,cablesbetweenexternaldevicesandtheproductareroutedintothepro-
ductthroughthebottomcableinlet.
*Thefigureisforreferenceonly.Theproductreceivedmaydiffer.
SystemManual 6ElectricalConnection
32
No. Description
A DCinputcableinlet
B Powerdistributionandcommunicationcableinlet
C ACoutputcableinlet
D Pressurereliefarea
6.3.4.1CableInletPreparation
Step1Identifythepositioningmarksonthebottom.
Step2Drillholesatthepositioningmarks.
Step3Leadcablesthroughholesintothecabinet.
Whenthewiringiscompleted,sealthegapbetweencablesandholeswithfire-
proof/waterproofmaterialssuchasfireproofmudtopreventforeignmatteror
moisturefromenteringandaffectingthelong-termnormaloperationofthe
product!
--End
6.4GroundConnection
Productsmustbereliablygrounded!
•Thegroundingcablemustbereliablygrounded,otherwise,itmaycauseafatal
electricshocktotheoperator.
•Thegroundingcablemustbereliablygrounded,otherwise,equipmentmaybe
damagedifstruckbylightning.
•Thegroundingcablemustbereliablygrounded,otherwise,equipmentmaynot
operatenormally.
6ElectricalConnection SystemManual
No. Description
A DCinputcableinlet
B Powerdistributionandcommunicationcableinlet
C ACoutputcableinlet
D Pressurereliefarea
6.3.4.1CableInletPreparation
Step1Identifythepositioningmarksonthebottom.
Step2Drillholesatthepositioningmarks.
Step3Leadcablesthroughholesintothecabinet.
Whenthewiringiscompleted,sealthegapbetweencablesandholeswithfire-
proof/waterproofmaterialssuchasfireproofmudtopreventforeignmatteror
moisturefromenteringandaffectingthelong-termnormaloperationofthe
product!
--End
6.4GroundConnection
Productsmustbereliablygrounded!
•Thegroundingcablemustbereliablygrounded,otherwise,itmaycauseafatal
electricshocktotheoperator.
•Thegroundingcablemustbereliablygrounded,otherwise,equipmentmaybe
damagedifstruckbylightning.
•Thegroundingcablemustbereliablygrounded,otherwise,equipmentmaynot
operatenormally.
6ElectricalConnection SystemManual
33
•Connectthegroundingterminaltotheprotectivegroundingpointbeforecon-
nectingACcables,DCcables,andcommunicationcables.
•Bothgroundingterminalsonthesideoftheproductmustbeconnectedtothe
protectivegroundingpointsreliably.SUNGROW shallnotbeheldliableforany
damagecausedbytheviolation.
Notethefollowingduringgroundconnection:
•Observespecificcodesandregulationsofthecountry/regionwheretheproject
islocatedtoperformgroundconnections.
•AllgroundingconnectionsinsidethePVsystemmustbesecureandreliable.
•Measuretoensurethegroundresistanceisnomorethan4Ωafterground
connection.
6.4.1Overview
Therearetwogroundingmethods:fixingbyweldingwithgroundingflatsteelandfixingwith
groundingcable.
6.4.2GroundingFlatSteel
Weld60mmx100mmhot-dipgalvanizedflatsteeltothegroundingpoint.
6.4.3GroundingCable
Use50mm
2
~95mm
2
groundingcablestoreliablyconnectthetwogroundingterminalsto
thegroundingpointsofthesystem.
SystemManual 6ElectricalConnection
•Connectthegroundingterminaltotheprotectivegroundingpointbeforecon-
nectingACcables,DCcables,andcommunicationcables.
•Bothgroundingterminalsonthesideoftheproductmustbeconnectedtothe
protectivegroundingpointsreliably.SUNGROW shallnotbeheldliableforany
damagecausedbytheviolation.
Notethefollowingduringgroundconnection:
•Observespecificcodesandregulationsofthecountry/regionwheretheproject
islocatedtoperformgroundconnections.
•AllgroundingconnectionsinsidethePVsystemmustbesecureandreliable.
•Measuretoensurethegroundresistanceisnomorethan4Ωafterground
connection.
6.4.1Overview
Therearetwogroundingmethods:fixingbyweldingwithgroundingflatsteelandfixingwith
groundingcable.
6.4.2GroundingFlatSteel
Weld60mmx100mmhot-dipgalvanizedflatsteeltothegroundingpoint.
6.4.3GroundingCable
Use50mm
2
~95mm
2
groundingcablestoreliablyconnectthetwogroundingterminalsto
thegroundingpointsofthesystem.
SystemManual 6ElectricalConnection
34
1:Heatshrinktubing 2:OT/DTterminal
6.5DCInputConnection
ThePVstringwillgeneratelethalhighvoltagewhenexposedtosunlight.
RespectallsafetyinstructionslistedinrelevantdocumentsaboutPVstrings.
•MakesurethePVarrayiswellinsulatedtothegroundbeforeconnectingitto
theinverter.
•MakesurethemaximumDCvoltageandthemaximumshortcircuitcurrentof
anystringneverexceedinverterpermittedvaluesspecifiedin"Technical
Parameters".
•CheckandconfirmthepolaritycorrectnessofthePVstring,andthenconnectit
tothecorrespondingpositionofthisproduct.
•Wheninstallingandoperatingtheproduct,makesurethatthepositiveornega-
tivepolaritiesofPVstringsdonotshort-circuittotheground.Otherwise,anAC
orDCshort-circuitmayoccur,resultinginproductdamage.Thedamage
causedbythisisnotcoveredbythewarranty.
6.5.1Overview
DCwiringarea
6ElectricalConnection SystemManual
1:Heatshrinktubing 2:OT/DTterminal
6.5DCInputConnection
ThePVstringwillgeneratelethalhighvoltagewhenexposedtosunlight.
RespectallsafetyinstructionslistedinrelevantdocumentsaboutPVstrings.
•MakesurethePVarrayiswellinsulatedtothegroundbeforeconnectingitto
theinverter.
•MakesurethemaximumDCvoltageandthemaximumshortcircuitcurrentof
anystringneverexceedinverterpermittedvaluesspecifiedin"Technical
Parameters".
•CheckandconfirmthepolaritycorrectnessofthePVstring,andthenconnectit
tothecorrespondingpositionofthisproduct.
•Wheninstallingandoperatingtheproduct,makesurethatthepositiveornega-
tivepolaritiesofPVstringsdonotshort-circuittotheground.Otherwise,anAC
orDCshort-circuitmayoccur,resultinginproductdamage.Thedamage
causedbythisisnotcoveredbythewarranty.
6.5.1Overview
DCwiringarea
6ElectricalConnection SystemManual
35
NegativeGrounding
figure6-17–wayDCInput
figure6-27–wayDCInputWithMPLC
SystemManual 6ElectricalConnection
NegativeGrounding
figure6-17–wayDCInput
figure6-27–wayDCInputWithMPLC
SystemManual 6ElectricalConnection
36
FloatingGrounding
figure6-37–wayDCInput
figure6-47–wayDCinputWithMPLC
*Thewiringareaissubjecttotheactualproduct
Mark Description
DC+ DCsidepositivecableconnectionarea
DC- DCsidenegativecableconnectionarea
φ17 Copperbardiameter
Wiringhole Bolt Torque(N.m)
φ17 M16 119–140N.m
Allshowninthefiguresare7-wayDCinput.WhenDCInputis6-way,removethe
rightmostDCfuseandDCwiringcopperbar;WhentheDCinputis5-way,remove
oneDCfuseandDCwiringcopperbarfromeachendontheleftandright.
6.5.2InstallingInsulationBoardbeforeConnection
Installinginsulationboardbeforecableconnections.
Step1Removethetwofixingscrewsontheinsulationboardwithascrewdrive.
6ElectricalConnection SystemManual
FloatingGrounding
figure6-37–wayDCInput
figure6-47–wayDCinputWithMPLC
*Thewiringareaissubjecttotheactualproduct
Mark Description
DC+ DCsidepositivecableconnectionarea
DC- DCsidenegativecableconnectionarea
φ17 Copperbardiameter
Wiringhole Bolt Torque(N.m)
φ17 M16 119–140N.m
Allshowninthefiguresare7-wayDCinput.WhenDCInputis6-way,removethe
rightmostDCfuseandDCwiringcopperbar;WhentheDCinputis5-way,remove
oneDCfuseandDCwiringcopperbarfromeachendontheleftandright.
6.5.2InstallingInsulationBoardbeforeConnection
Installinginsulationboardbeforecableconnections.
Step1Removethetwofixingscrewsontheinsulationboardwithascrewdrive.
6ElectricalConnection SystemManual
37
Step2Moveinsulationboarddownontothebottomplate,andmakesureitisplacedbetweenthe
positiveandnegativecables.
Step3InstallthenegativeandpositiveDCcables.
Step4Movetheinsulationboardupwardtoitsoriginalpositionandinstallthetwofixingscrews.
--End
*Thefigureisforreferenceonly.Theproductreceivedmaydiffer.
6.5.3Procedure
Step1Leadthecableintothewiringareathroughtheinlethole,andmarkthecablepolarity.
Step2Striptheprotectivelayerofthecabletoexposethecoppercoreofthewirewithstrippers.
Step3InstalltheOT/DTterminaltothewireandcrimpthemwithacrimpingtool.Installaheat
shrinktubingtotheterminalandheatitwithaheatgun.
SystemManual 6ElectricalConnection
Step2Moveinsulationboarddownontothebottomplate,andmakesureitisplacedbetweenthe
positiveandnegativecables.
Step3InstallthenegativeandpositiveDCcables.
Step4Movetheinsulationboardupwardtoitsoriginalpositionandinstallthetwofixingscrews.
--End
*Thefigureisforreferenceonly.Theproductreceivedmaydiffer.
6.5.3Procedure
Step1Leadthecableintothewiringareathroughtheinlethole,andmarkthecablepolarity.
Step2Striptheprotectivelayerofthecabletoexposethecoppercoreofthewirewithstrippers.
Step3InstalltheOT/DTterminaltothewireandcrimpthemwithacrimpingtool.Installaheat
shrinktubingtotheterminalandheatitwithaheatgun.
SystemManual 6ElectricalConnection
38
Step4SecuretheOT/DTterminaltothecopperbarbyM16x45boltswithatighteningtorqueof
119-140N.m.
•Ifcopperwiresareused,fastentheboltassemblyasshownbelow.
figure6-5CopperWireConnection
•Ifaluminumwiresareused,fastentheboltassemblyasshownbelow.
figure6-6AluminumWireConnection
Step5Pullthecablebackslightlyafterwiringtoensurethatthecableislongenough.
•Ensurethattheselectedterminalcandirectlycontactthecopperbar.Ifthere
areanyproblems,contacttheterminalmanufacturer.
•Ensurethatthecopperbarisnotindirectcontactwiththealuminumwire.
Otherwise,electrochemicalcorrosionmayoccur,impairingthereliabilityofthe
electricalconnections.
•Pleaseensuretheupperandlowercopperbarsarekeptinthesameplane
withadeviationoflessthan10mmwhileperformingDCwiring.
•Fixthecableafterwiring,andreserveacertainlengthtoavoiddamagecaused
byexcessiveforceonthewiringcopperbarduetofoundationsinkingand
otherproblems.
6ElectricalConnection SystemManual
Step4SecuretheOT/DTterminaltothecopperbarbyM16x45boltswithatighteningtorqueof
119-140N.m.
•Ifcopperwiresareused,fastentheboltassemblyasshownbelow.
figure6-5CopperWireConnection
•Ifaluminumwiresareused,fastentheboltassemblyasshownbelow.
figure6-6AluminumWireConnection
Step5Pullthecablebackslightlyafterwiringtoensurethatthecableislongenough.
•Ensurethattheselectedterminalcandirectlycontactthecopperbar.Ifthere
areanyproblems,contacttheterminalmanufacturer.
•Ensurethatthecopperbarisnotindirectcontactwiththealuminumwire.
Otherwise,electrochemicalcorrosionmayoccur,impairingthereliabilityofthe
electricalconnections.
•Pleaseensuretheupperandlowercopperbarsarekeptinthesameplane
withadeviationoflessthan10mmwhileperformingDCwiring.
•Fixthecableafterwiring,andreserveacertainlengthtoavoiddamagecaused
byexcessiveforceonthewiringcopperbarduetofoundationsinkingand
otherproblems.
6ElectricalConnection SystemManual
39
--End
6.6ACSideConnection
6.6.1InspectionBeforeWiring
•CheckandensurethattheACsideoftheinverterunitisdisconnected.
Refertothetransformermanualandusethespeciallevertodisconnecttheloadswitch
ofthetransformer.
•OpentheouterandinnerdoorsoftheHVcompartmentofthetransformer.Checkand
ensurethattheindicatorontheinnerdoorisoff.
•CheckandensurethatthesleevesandcopperbarsinthewiringareaintheHVcompart-
mentarefreefromdamage,deformation,andfracture.
6.6.2Procedure
Step1Leadthecablefromexternaldevicethroughthecableentryonthebottomofthecable
compartment.
SystemManual 6ElectricalConnection
--End
6.6ACSideConnection
6.6.1InspectionBeforeWiring
•CheckandensurethattheACsideoftheinverterunitisdisconnected.
Refertothetransformermanualandusethespeciallevertodisconnecttheloadswitch
ofthetransformer.
•OpentheouterandinnerdoorsoftheHVcompartmentofthetransformer.Checkand
ensurethattheindicatorontheinnerdoorisoff.
•CheckandensurethatthesleevesandcopperbarsinthewiringareaintheHVcompart-
mentarefreefromdamage,deformation,andfracture.
6.6.2Procedure
Step1Leadthecablefromexternaldevicethroughthecableentryonthebottomofthecable
compartment.
SystemManual 6ElectricalConnection
40
Step2Preparetheterminalsandinstallthemtightly,wherereferencecanbemadetothecable
connectorinstallationmanual.
Thewiringterminalcanbeconnectedwitheithercoppercableoraluminiumcable.
•Incaseofcoppercable,usecopperwiringterminals.
•Incaseofaluminiumcable,usecopper-to-aluminiumadapterterminals.
TheHVwiringterminalcanbeconnectedtoamaximumoftwocables.Selecttheterminal
asneeded.
figure6-7OneCable
figure6-8TwoCables
--End
FurtherOperations
Sealthebottomcableentrieswithfire-proofmud,clearsundriesinsidethecabinet,and
reassemblethesealingplateofthecabinet.
Shouldtherebeanyunusedwiringterminals,blockthemwithinsulatingcaps.
6ElectricalConnection SystemManual
Step2Preparetheterminalsandinstallthemtightly,wherereferencecanbemadetothecable
connectorinstallationmanual.
Thewiringterminalcanbeconnectedwitheithercoppercableoraluminiumcable.
•Incaseofcoppercable,usecopperwiringterminals.
•Incaseofaluminiumcable,usecopper-to-aluminiumadapterterminals.
TheHVwiringterminalcanbeconnectedtoamaximumoftwocables.Selecttheterminal
asneeded.
figure6-7OneCable
figure6-8TwoCables
--End
FurtherOperations
Sealthebottomcableentrieswithfire-proofmud,clearsundriesinsidethecabinet,and
reassemblethesealingplateofthecabinet.
Shouldtherebeanyunusedwiringterminals,blockthemwithinsulatingcaps.
6ElectricalConnection SystemManual
41
6.7CommunicationConnection
6.7.1Overview
ThereisanRS485communicationterminalblockinsidethepowerdistributioncabinet.
table6-2PortMarkandDefinition(Example)
Marks Plug-compatibleDevices
ReservedRS485 PVS,meteostation,electricitymeter,transformer,etc.
6.7.2Procedure
Takeonecableasanexample.
Step1UseawirestrippertostripofftheRS485shieldedtwistedpair.
Step2Pressthemetalplateabovetheterminalwithascrewdriver.
Step3Insertthecableintothecorrespondingwiringhole.
Step4Loosenthescrewdriver,themetalplatereturnsandcompressesthecable.
*Thefigureisforreferenceonly.Theproductreceivedmaydiffer.
--End
6.8Switch/EthernetCommunication
Overview
TheswitchorEthernetportissetinsidethepowerdistributioncabinet,markedrespectively
asAandBinthefigurebelow.PleaseadoptswitchorEthernetcommunicationaccordingto
theactualsituationonsite.
SystemManual 6ElectricalConnection
6.7CommunicationConnection
6.7.1Overview
ThereisanRS485communicationterminalblockinsidethepowerdistributioncabinet.
table6-2PortMarkandDefinition(Example)
Marks Plug-compatibleDevices
ReservedRS485 PVS,meteostation,electricitymeter,transformer,etc.
6.7.2Procedure
Takeonecableasanexample.
Step1UseawirestrippertostripofftheRS485shieldedtwistedpair.
Step2Pressthemetalplateabovetheterminalwithascrewdriver.
Step3Insertthecableintothecorrespondingwiringhole.
Step4Loosenthescrewdriver,themetalplatereturnsandcompressesthecable.
*Thefigureisforreferenceonly.Theproductreceivedmaydiffer.
--End
6.8Switch/EthernetCommunication
Overview
TheswitchorEthernetportissetinsidethepowerdistributioncabinet,markedrespectively
asAandBinthefigurebelow.PleaseadoptswitchorEthernetcommunicationaccordingto
theactualsituationonsite.
SystemManual 6ElectricalConnection
42
figure6-95KPowerDistributionCabinet
figure6-1015KPowerDistributionCabinet
ConnectexternalmonitoringdevicestotheswitchportorEthernetportbyaCAT-5ecable.
6.9CheckAfterWiring
6.9.1Inspection
Checkthewiringthoroughlyandcarefullywhenallelectricalconnectionshavebeen
completed.
•Sealthegapbetweencablesandthewiringholeswithfireproofandwaterproofmaterials.
•Putallprotectivecoversbackinplacefirmly.
Whenthewiringiscompleted,checkforthewiringcorrectnessandthensealthe
gapbetweencablesandinletandoutletholeswithfireproof/waterproofmaterials
suchasfireproofmudtopreventforeignmatterormoisturefromenteringandaf-
fectingthelong-termnormaloperationoftheinverter.
6.9.2LockingCabinetDoor
Step1Releasethefixingdoorsoftheinverterunitcabinetandthepowerdistributioncabinet.Unfix
inreverseofthefixingmethod，refer to"6.3.2OpentheProductDoor".
Itisforbiddentoclosethedoorforciblywhenthedoorisfixed.
6ElectricalConnection SystemManual
figure6-95KPowerDistributionCabinet
figure6-1015KPowerDistributionCabinet
ConnectexternalmonitoringdevicestotheswitchportorEthernetportbyaCAT-5ecable.
6.9CheckAfterWiring
6.9.1Inspection
Checkthewiringthoroughlyandcarefullywhenallelectricalconnectionshavebeen
completed.
•Sealthegapbetweencablesandthewiringholeswithfireproofandwaterproofmaterials.
•Putallprotectivecoversbackinplacefirmly.
Whenthewiringiscompleted,checkforthewiringcorrectnessandthensealthe
gapbetweencablesandinletandoutletholeswithfireproof/waterproofmaterials
suchasfireproofmudtopreventforeignmatterormoisturefromenteringandaf-
fectingthelong-termnormaloperationoftheinverter.
6.9.2LockingCabinetDoor
Step1Releasethefixingdoorsoftheinverterunitcabinetandthepowerdistributioncabinet.Unfix
inreverseofthefixingmethod，refer to"6.3.2OpentheProductDoor".
Itisforbiddentoclosethedoorforciblywhenthedoorisfixed.
6ElectricalConnection SystemManual
43
Step2Lockthecabinetdoorandpulloutthekey.
Electricshockhazard!
Besuretolockthecabinetdoor.Otherwise,non-professionalsmaybeexposedto
therunningmachine,anditmaycausecasualties.
--End
SystemManual 6ElectricalConnection
Step2Lockthecabinetdoorandpulloutthekey.
Electricshockhazard!
Besuretolockthecabinetdoor.Otherwise,non-professionalsmaybeexposedto
therunningmachine,anditmaycausecasualties.
--End
SystemManual 6ElectricalConnection
44
7PoweringupandPoweringdown
7.1SafetyInstructions
Whentheproductisworking:
•Itisstrictlyforbiddentotouchthelivepartsoftheproduct.Otherwise,anelec-
tricshockmayoccur.
•Itisstrictlyprohibitedtodisassembleanypartsoftheproduct.Otherwise,an
electricshockmayoccur.
•Itisstrictlyprohibitedtotouchanyhotpartsoftheproduct(suchastheheat
sink).Otherwise,itmaycauseburns.
Eveniftheinverterisshutdown,itmaystillbehotandcauseburns.Operatingthe
inverterwithprotectiveglovesafteritcoolsdown.
Presstheemergencystopbuttononlywhentheproductfailsoranemergencyoc-
curstoensurethattheproductrespondsquickly.
Theproductcanonlybeputintooperationafterconfirmedbyaprofessionaland
approvedbythelocalpowerdepartment.
Fortheproductwithalongshutdowntime,itmustbecheckedthoroughlyand
carefullytoensureallindexesareacceptablebeforebeingpoweredon.
7.2PoweringUpOperations
7.2.1RemovingFilmonProduct
Thehighlightedpartsoftheproductinthefiguresbelowarecoveredwithfilms.Besureto
removethefilmsbeforetheproductisofficiallyputintooperation.
FilmsDistributionAreaofProduct
7PoweringupandPoweringdown
7.1SafetyInstructions
Whentheproductisworking:
•Itisstrictlyforbiddentotouchthelivepartsoftheproduct.Otherwise,anelec-
tricshockmayoccur.
•Itisstrictlyprohibitedtodisassembleanypartsoftheproduct.Otherwise,an
electricshockmayoccur.
•Itisstrictlyprohibitedtotouchanyhotpartsoftheproduct(suchastheheat
sink).Otherwise,itmaycauseburns.
Eveniftheinverterisshutdown,itmaystillbehotandcauseburns.Operatingthe
inverterwithprotectiveglovesafteritcoolsdown.
Presstheemergencystopbuttononlywhentheproductfailsoranemergencyoc-
curstoensurethattheproductrespondsquickly.
Theproductcanonlybeputintooperationafterconfirmedbyaprofessionaland
approvedbythelocalpowerdepartment.
Fortheproductwithalongshutdowntime,itmustbecheckedthoroughlyand
carefullytoensureallindexesareacceptablebeforebeingpoweredon.
7.2PoweringUpOperations
7.2.1RemovingFilmonProduct
Thehighlightedpartsoftheproductinthefiguresbelowarecoveredwithfilms.Besureto
removethefilmsbeforetheproductisofficiallyputintooperation.
FilmsDistributionAreaofProduct
45
figure7-1RemoveFilmfromtheProduct
FilmsDistributionAreaofPowerDistributionCabinet
figure7-2RemoveFilmatAirInlet/OutletofPowerDistributionCabinet
*Thefigureisforreferenceonly.Andtheactualproductreceivedshallprevail.
7.2.2RemovingPressureReliefScrew
Besuretoremovethepressurereliefscrewsatthebottomoftheinverterunit(markedasA
inthefigurebelow)beforetheproductisofficiallyputintooperation.
SystemManual 7PoweringupandPoweringdown
figure7-1RemoveFilmfromtheProduct
FilmsDistributionAreaofPowerDistributionCabinet
figure7-2RemoveFilmatAirInlet/OutletofPowerDistributionCabinet
*Thefigureisforreferenceonly.Andtheactualproductreceivedshallprevail.
7.2.2RemovingPressureReliefScrew
Besuretoremovethepressurereliefscrewsatthebottomoftheinverterunit(markedasA
inthefigurebelow)beforetheproductisofficiallyputintooperation.
SystemManual 7PoweringupandPoweringdown
46
7.2.3InstallingFuseinACSPD
Step1OpenthefuseholderintheACside.(SPDfuseposition,see"3.3.2InternalStructureofIn-
verterUnit")
Step2Insertfuses.
Step3ClosethefuseholderintheACsideSPD.
--End
7.2.4AdjustingDe-energizedTapChanger
Adjusttheoutputvoltageofthetransformer.Whenoperatingthede-energizedtapchanger,
ensurethatthetransformerisinanon-excitationstate,thatis,thehighandlowvoltage
sidesofthetransformerareuncharged.
WhenthevoltageontheLVsideremainsunchanged,theoutputvoltageontheHVsideun-
derdifferentgearsis:
Gear OutputVoltage
1(A) Standardvoltagex1.05
2(B) Standardvoltagex1.025
3(C) Standardvoltagex1.0
4(D) Standardvoltagex0.975
5(E) Standardvoltagex0.95
Takeadjustingtogear1asanexample,operatethede-energizedtapchangerasfollows.
7PoweringupandPoweringdown SystemManual
7.2.3InstallingFuseinACSPD
Step1OpenthefuseholderintheACside.(SPDfuseposition,see"3.3.2InternalStructureofIn-
verterUnit")
Step2Insertfuses.
Step3ClosethefuseholderintheACsideSPD.
--End
7.2.4AdjustingDe-energizedTapChanger
Adjusttheoutputvoltageofthetransformer.Whenoperatingthede-energizedtapchanger,
ensurethatthetransformerisinanon-excitationstate,thatis,thehighandlowvoltage
sidesofthetransformerareuncharged.
WhenthevoltageontheLVsideremainsunchanged,theoutputvoltageontheHVsideun-
derdifferentgearsis:
Gear OutputVoltage
1(A) Standardvoltagex1.05
2(B) Standardvoltagex1.025
3(C) Standardvoltagex1.0
4(D) Standardvoltagex0.975
5(E) Standardvoltagex0.95
Takeadjustingtogear1asanexample,operatethede-energizedtapchangerasfollows.
7PoweringupandPoweringdown SystemManual
47
7.2.5OpeningPressureReliefValve
Openthecaponthepressurereliefvalve(markedasAbelow).
7.2.6RemovingFoamPartfromOilThermometer
Removetheprotectivecoverontheoilthermometerandremovethefoampartsinthepro-
tectivecoverbeforetheinverterisofficiallyputintooperation.
Afterremoval,re-installtheprotectivecover.
7.2.7DrainingOilfromTransformer
Ifthetransformeristransportedwithafulloiltank,drainsomeoilfromthetransformerafter
theproductistransportedtothesite.
No. Device Source
1 Cleanhosesandoiltank Notincludedinthescopeofsupply
SystemManual 7PoweringupandPoweringdown
7.2.5OpeningPressureReliefValve
Openthecaponthepressurereliefvalve(markedasAbelow).
7.2.6RemovingFoamPartfromOilThermometer
Removetheprotectivecoverontheoilthermometerandremovethefoampartsinthepro-
tectivecoverbeforetheinverterisofficiallyputintooperation.
Afterremoval,re-installtheprotectivecover.
7.2.7DrainingOilfromTransformer
Ifthetransformeristransportedwithafulloiltank,drainsomeoilfromthetransformerafter
theproductistransportedtothesite.
No. Device Source
1 Cleanhosesandoiltank Notincludedinthescopeofsupply
SystemManual 7PoweringupandPoweringdown
48
No. Device Source
2 Cleaningcloth
3 Wrench
4 Adjustablewrench
5 Hoseconnector
6 Pipeclamp
Step1Ensurethatthedrainvalveisclosed.
Step2Removethecoverplateofthedrainvalve.
Step3Removethecoverplateofthedrainvalve.
Step4Openthedrainvalveandtheoilinthetransformerslowlyflowsfromthetransformerintothe
tank.
Step5Checkthepositionoftheoillevelgaugeaccordingtothetemperature-levelcurveaccording
tothelocalambienttemperature.Stopdrainingwhentheoilinthetransformerisreducedto
therequiredlevel.
Step6Closethedrainvalveandremovethedrainhoseconnectorandthehose.
Step7Re-installthecoverplateofthedrainvalve.
--End
7.3InspectionBeforePoweringUp
7.3.1Inverter
•EnsurethattheACandDCswitchesandallinternalminiaturecircuitbreakersare
disconnected.
7PoweringupandPoweringdown SystemManual
No. Device Source
2 Cleaningcloth
3 Wrench
4 Adjustablewrench
5 Hoseconnector
6 Pipeclamp
Step1Ensurethatthedrainvalveisclosed.
Step2Removethecoverplateofthedrainvalve.
Step3Removethecoverplateofthedrainvalve.
Step4Openthedrainvalveandtheoilinthetransformerslowlyflowsfromthetransformerintothe
tank.
Step5Checkthepositionoftheoillevelgaugeaccordingtothetemperature-levelcurveaccording
tothelocalambienttemperature.Stopdrainingwhentheoilinthetransformerisreducedto
therequiredlevel.
Step6Closethedrainvalveandremovethedrainhoseconnectorandthehose.
Step7Re-installthecoverplateofthedrainvalve.
--End
7.3InspectionBeforePoweringUp
7.3.1Inverter
•EnsurethattheACandDCswitchesandallinternalminiaturecircuitbreakersare
disconnected.
7PoweringupandPoweringdown SystemManual
49
•Checkandensurethattheemergencystopbuttonisreleased.
•Checkvariousupstreamanddownstreamelectricalswitchesandbuttons,aswellas
thoseontheinverter,tomakesurethattheycanbeoperatedflexiblyandmeetthe
requirements.
•Checkwhetherthefilmattheairinletandoutletareremoved.
•Checkwhetherthepressurereliefscrewhasbeenremoved.
•CheckwhetherthefuseisinstalledintheACSPD.
7.3.2PVArray
TheDCsidevoltageshallnotexceedthemaximumDCvoltageallowedfortheinverter.
Otherwise,theinvertermaybedamagedandevencausesafetyaccidents.
Toensurethestableandefficientoperationofthewholesystem,itisrecommendedthatbat-
teriesconnectedtoaninvertershouldbeofthesametypeandfromthesamemanufacturer,
andthenumberofbatteriesconnectedinseriesshouldbethesame.
7.3.3CheckingGridVoltage
•Measureaccuratelythegrid3-phaseline-to-linevoltages:L1-L2,L1-L3,andL2-L3.The
voltagesshouldnotexceedthegridpermissiblevoltageandthethreephasesarein
balance.
Adjustthetransferratioofthetransformerbyqualifiedpersonnelifthegridvoltage
deviationislarge.
•Measureandrecordthegridfrequency.Measureddatashouldnotexceedthegridper-
missiblefrequency.
•MeasuretheTHDandcheckthecurveifpossible.Theinverterwillstoprunningifthe
THDisserious.
•Recordaccuratelyallthemeasureddata.
7.3.4Transformer
•Ensurethattherearenooilleaksonthetransformersurface.
•Checkandensurethatthepointeroftheoillevelgaugeisinthenormalrange.
•Checkwhetherthesafetytabofthepressurereliefvalvehasbeenremoved.
•Checkandensurethatthetemperaturemeasurementcircuitiscomplete.
•CheckandensurethattheSPDisfirmlyandreliablyinstalled.
•Checkandensurethatthefoamintheoiltemperaturedialisremoved.
•Checkandensurethattheoilleakageportofthetransformerroomisnotclogged.
•Checktheexternalair-insulatedgapdistance,andwhethertheair-insulateddistancebe-
tweenthebushingsofdifferentvoltagelevelsandthegroundmeetstherelevant
standards.
SystemManual 7PoweringupandPoweringdown
•Checkandensurethattheemergencystopbuttonisreleased.
•Checkvariousupstreamanddownstreamelectricalswitchesandbuttons,aswellas
thoseontheinverter,tomakesurethattheycanbeoperatedflexiblyandmeetthe
requirements.
•Checkwhetherthefilmattheairinletandoutletareremoved.
•Checkwhetherthepressurereliefscrewhasbeenremoved.
•CheckwhetherthefuseisinstalledintheACSPD.
7.3.2PVArray
TheDCsidevoltageshallnotexceedthemaximumDCvoltageallowedfortheinverter.
Otherwise,theinvertermaybedamagedandevencausesafetyaccidents.
Toensurethestableandefficientoperationofthewholesystem,itisrecommendedthatbat-
teriesconnectedtoaninvertershouldbeofthesametypeandfromthesamemanufacturer,
andthenumberofbatteriesconnectedinseriesshouldbethesame.
7.3.3CheckingGridVoltage
•Measureaccuratelythegrid3-phaseline-to-linevoltages:L1-L2,L1-L3,andL2-L3.The
voltagesshouldnotexceedthegridpermissiblevoltageandthethreephasesarein
balance.
Adjustthetransferratioofthetransformerbyqualifiedpersonnelifthegridvoltage
deviationislarge.
•Measureandrecordthegridfrequency.Measureddatashouldnotexceedthegridper-
missiblefrequency.
•MeasuretheTHDandcheckthecurveifpossible.Theinverterwillstoprunningifthe
THDisserious.
•Recordaccuratelyallthemeasureddata.
7.3.4Transformer
•Ensurethattherearenooilleaksonthetransformersurface.
•Checkandensurethatthepointeroftheoillevelgaugeisinthenormalrange.
•Checkwhetherthesafetytabofthepressurereliefvalvehasbeenremoved.
•Checkandensurethatthetemperaturemeasurementcircuitiscomplete.
•CheckandensurethattheSPDisfirmlyandreliablyinstalled.
•Checkandensurethatthefoamintheoiltemperaturedialisremoved.
•Checkandensurethattheoilleakageportofthetransformerroomisnotclogged.
•Checktheexternalair-insulatedgapdistance,andwhethertheair-insulateddistancebe-
tweenthebushingsofdifferentvoltagelevelsandthegroundmeetstherelevant
standards.
SystemManual 7PoweringupandPoweringdown
50
7.4PoweringUpSteps
Step1ClosethemaintenanceswitchQS2ofallinvertersandclosetheinternalswitchQS4inside
thepowerdistributioncabinet.
Step2Closetheloadswitchofthetransformer.
Step3Click“Overview”→“GeneralInformation”andclick“Shutdown”inthe“Shortcut
Menu”ontheWebpagetoshutdowntheinverter.
Step4Checkandensurethatthe“AccessProtectionEnabling”switchisoffontheWebpage.
Step5ClosetheoutputswitchoftheupstreamPVS.
Step6ClosetheDCloadswitchQS1insideallinverters.
Step7Rotatethe“START/STOP”knobtothe“START”position.
Step8StarttheinverterontheWebpage,andtheinverterbeginstoenterthegrid-connectedop-
erationstate.
Forthepositionoftheaboveswitches,pleasesee"3.3.2InternalStructureofIn-
verterUnit"and"3.3.4MainPartsofPowerDistributionCabinet".
--End
7.5PoweringDownOperations
7.5.1PlannedPoweringDown
Step1Click“Overview”→“GeneralInformation”andclick“Shutdown”inthe“Shortcut
Menu”ontheWebpagetoshutdowntheinverter.
Step2DisconnecttheoutputswitchoftheupstreamPVS.
Step3Rotatethe“START/STOP”knobtothe“STOP”position.
Step4OpentheACcabinetdoor,checkandensurethattheACcircuitbreakerQF1ofallinverters
isdisconnected.
Step5DisconnectthemaintenanceswitchQS2ofallinverters.
Step6OpentheDCcabinetdoor,disconnecttheDCloadswitchQS1insideallinverters.
Step7DisconnecttheinternalswitchofthepowerdistributioncabinetQS4.
Step8Disconnecttheloadswitchofthetransformer.
Forthepositionoftheaboveswitches,pleasesee"3.3.2InternalStructureofIn-
verterUnit"and"3.3.4MainPartsofPowerDistributionCabinet".
--End
7PoweringupandPoweringdown SystemManual
7.4PoweringUpSteps
Step1ClosethemaintenanceswitchQS2ofallinvertersandclosetheinternalswitchQS4inside
thepowerdistributioncabinet.
Step2Closetheloadswitchofthetransformer.
Step3Click“Overview”→“GeneralInformation”andclick“Shutdown”inthe“Shortcut
Menu”ontheWebpagetoshutdowntheinverter.
Step4Checkandensurethatthe“AccessProtectionEnabling”switchisoffontheWebpage.
Step5ClosetheoutputswitchoftheupstreamPVS.
Step6ClosetheDCloadswitchQS1insideallinverters.
Step7Rotatethe“START/STOP”knobtothe“START”position.
Step8StarttheinverterontheWebpage,andtheinverterbeginstoenterthegrid-connectedop-
erationstate.
Forthepositionoftheaboveswitches,pleasesee"3.3.2InternalStructureofIn-
verterUnit"and"3.3.4MainPartsofPowerDistributionCabinet".
--End
7.5PoweringDownOperations
7.5.1PlannedPoweringDown
Step1Click“Overview”→“GeneralInformation”andclick“Shutdown”inthe“Shortcut
Menu”ontheWebpagetoshutdowntheinverter.
Step2DisconnecttheoutputswitchoftheupstreamPVS.
Step3Rotatethe“START/STOP”knobtothe“STOP”position.
Step4OpentheACcabinetdoor,checkandensurethattheACcircuitbreakerQF1ofallinverters
isdisconnected.
Step5DisconnectthemaintenanceswitchQS2ofallinverters.
Step6OpentheDCcabinetdoor,disconnecttheDCloadswitchQS1insideallinverters.
Step7DisconnecttheinternalswitchofthepowerdistributioncabinetQS4.
Step8Disconnecttheloadswitchofthetransformer.
Forthepositionoftheaboveswitches,pleasesee"3.3.2InternalStructureofIn-
verterUnit"and"3.3.4MainPartsofPowerDistributionCabinet".
--End
7PoweringupandPoweringdown SystemManual
51
7.5.2Unplanned(Emergency)PoweringDown
Step1Presstheemergencybutton.turn“START/STOP”knobtothe“STOP”position.
Step2DisconnecttheoutputswitchoftheupstreamPVS.
Step3OpentheACcabinetdoor,checkandensurethattheACcircuitbreakerQF1ofallinverters
isdisconnected.
Step4DisconnectthemaintenanceswitchQS2ofallinverters.
Step5CheckandensurethattheDCsideloadswitchQS1ofallinvertersisdisconnected.
Step6TurnthemainswitchQS4insidethepowerdistributioncabinettoOFF
Step7Disconnecttheloadswitchoftheinverterandthetransformer.
Forthepositionoftheaboveswitches,pleasesee"3.3.2InternalStructureofIn-
verterUnit"and"3.3.4MainPartsofPowerDistributionCabinet".
--End
SystemManual 7PoweringupandPoweringdown
7.5.2Unplanned(Emergency)PoweringDown
Step1Presstheemergencybutton.turn“START/STOP”knobtothe“STOP”position.
Step2DisconnecttheoutputswitchoftheupstreamPVS.
Step3OpentheACcabinetdoor,checkandensurethattheACcircuitbreakerQF1ofallinverters
isdisconnected.
Step4DisconnectthemaintenanceswitchQS2ofallinverters.
Step5CheckandensurethattheDCsideloadswitchQS1ofallinvertersisdisconnected.
Step6TurnthemainswitchQS4insidethepowerdistributioncabinettoOFF
Step7Disconnecttheloadswitchoftheinverterandthetransformer.
Forthepositionoftheaboveswitches,pleasesee"3.3.2InternalStructureofIn-
verterUnit"and"3.3.4MainPartsofPowerDistributionCabinet".
--End
SystemManual 7PoweringupandPoweringdown
52
8O&MonWEB
ItisrecommendedtoperformO&MontheWEBinterfaceafterthedeviceispoweredon.
8.1CommunicationsDiagram
ThewiringbetweentheinternaldevicesoftheMVgrid-connectedinverterhasbeencom-
pletedbeforedelivery.ConnectthePCwiththeswitchinsidethepowerdistributioncabinet
withtheCAT-5ecableonsite.Afterthat,theWEBinterfacecanbeaccessedonaPC.
figure8-1WiredCommunicationDiagram
Awirelesscommunicationmoduleisembeddedinsidetheinverter,andtheWEBinterface
canalsobeaccessedthroughmobiledevicessuchasmobilephones.
Note:Ensurethatthedistancedbetweenthefrontofthe#1inverterandthemobiledevice
meetstherequirements:
8O&MonWEB
ItisrecommendedtoperformO&MontheWEBinterfaceafterthedeviceispoweredon.
8.1CommunicationsDiagram
ThewiringbetweentheinternaldevicesoftheMVgrid-connectedinverterhasbeencom-
pletedbeforedelivery.ConnectthePCwiththeswitchinsidethepowerdistributioncabinet
withtheCAT-5ecableonsite.Afterthat,theWEBinterfacecanbeaccessedonaPC.
figure8-1WiredCommunicationDiagram
Awirelesscommunicationmoduleisembeddedinsidetheinverter,andtheWEBinterface
canalsobeaccessedthroughmobiledevicessuchasmobilephones.
Note:Ensurethatthedistancedbetweenthefrontofthe#1inverterandthemobiledevice
meetstherequirements:
53
figure8-2WirelessCommunicationDiagram
8.2PreparationBeforeLogin
8.2.1Login(PC)
Step1ToconnectthePCtotheproduct,connectthenetworkcabletothenetworkportofthePMD
switch.
Step2ConfiguretheIPaddressofthePC.SettheIPaddressofthePCtothesamenetworkseg-
mentastheNET1addressofthesmartunitboard.
DefaultIPaddressoftheNET1port:12.12.12.12.
DefaultIPaddressoftheNET2port:14.14.14.14.
--End
8.2.2Login(MobileDevice)
Step1EnableWiFionthemobiledevice(suchasamobilephone),searchforthehotspot,suchas
SG-xxx(xxxrepresentsthedeviceSN),andenterthepassword.
Step2Openabrowseronthemobilephoneandentertheaddress(11.11.11.1)ordomain(sungrow.
net)toaccesstheWEBinterface.
--End
SystemManual 8O&MonWEB
figure8-2WirelessCommunicationDiagram
8.2PreparationBeforeLogin
8.2.1Login(PC)
Step1ToconnectthePCtotheproduct,connectthenetworkcabletothenetworkportofthePMD
switch.
Step2ConfiguretheIPaddressofthePC.SettheIPaddressofthePCtothesamenetworkseg-
mentastheNET1addressofthesmartunitboard.
DefaultIPaddressoftheNET1port:12.12.12.12.
DefaultIPaddressoftheNET2port:14.14.14.14.
--End
8.2.2Login(MobileDevice)
Step1EnableWiFionthemobiledevice(suchasamobilephone),searchforthehotspot,suchas
SG-xxx(xxxrepresentsthedeviceSN),andenterthepassword.
Step2Openabrowseronthemobilephoneandentertheaddress(11.11.11.1)ordomain(sungrow.
net)toaccesstheWEBinterface.
--End
SystemManual 8O&MonWEB
54
8.3LoginSteps
Step1Entertheserveraddresstoenterthehomepageasavisitorbydefault.
PC:
•NET1port,URL:12.12.12.12.
•NET2port,URL:14.14.14.14.
Mobiledevice:
URL:11.11.11.1.
Step2Click
andselectthedesiredlanguageintheupperrightcorneroftheinterface.
Step3Click
toenterthelogininterface.
Step4EnterthepasswordandclickLogintoentertheinterfaceasageneraluser.
PCpassword:pw8888.
Mobiledevicepassword:ESPWifi@123.
Aftertheinitiallogin,pleasechangethepasswordinatimelymannertoavoid
pop-upmodifypasswordprompts.
--End
8.4InterfaceIntroduction
8.4.1Homepage
No. Description
A Navigationbar
B Functiondisplayarea
C Faultnumber
D Alarmnumber
8O&MonWEB SystemManual
8.3LoginSteps
Step1Entertheserveraddresstoenterthehomepageasavisitorbydefault.
PC:
•NET1port,URL:12.12.12.12.
•NET2port,URL:14.14.14.14.
Mobiledevice:
URL:11.11.11.1.
Step2Click
andselectthedesiredlanguageintheupperrightcorneroftheinterface.
Step3Click
toenterthelogininterface.
Step4EnterthepasswordandclickLogintoentertheinterfaceasageneraluser.
PCpassword:pw8888.
Mobiledevicepassword:ESPWifi@123.
Aftertheinitiallogin,pleasechangethepasswordinatimelymannertoavoid
pop-upmodifypasswordprompts.
--End
8.4InterfaceIntroduction
8.4.1Homepage
No. Description
A Navigationbar
B Functiondisplayarea
C Faultnumber
D Alarmnumber
8O&MonWEB SystemManual
55
No. Description
E Languageswitchingoptions
F Usercenter
8.4.2ViewingFaultInformation
Step1Click“Overview”→“GeneralInformation”ontheleftnavigationbartoenterthe
homepage.
Step2Click
intheupper-rightcorneroftheinterfacetoviewinformationsuchasthenameand
timeofthefaultevent.
--End
8.4.3ViewingAlarmInformation
Step1Click“Overview”→“GeneralInformation”ontheleftnavigationbartoenterthe
homepage.
Step2Click
intheupper-rightcorneroftheinterfacetoviewinformationsuchasthenameand
timeofthefaultevent.
--End
8.4.4Boot/Shutdown
Step1Click“Overview”→“GeneralInformation”ontheleftnavigationbartoenterthe
homepage.
Step2ClickBootorShutdownintheShortcutMenu. TakingSG4400UDasanexample.
•Ifaninverterunitneedstobestarted,e.g.,Unit1,checkSG4400UD_Unit1andclick
Savetoturnontheunit.Ifthewholeinverterneedstobestarted,checktheinvertermod-
el,e.g.,SG4400UDandclickSavetoturnontheinverter.
•Ifaninverterunitneedstobeshutdown,e.g.,Unit1,checkSG4400UD_Unit1andclick
Savetoshutdowntheunit.Ifthewholeinverterneedstobeshutdown,checktheinver-
termodel,e.g.,SG4400UDandclickSavetoshutdowntheinverter.
--End
8.4.5SettingInitialParameters
Step1Click“DeviceMonitoring”intheleftnavigationbar.
Step2Pulldown“Country/Region”tosetaccordingtotheproductlocation,andpulldown
“MachineChoose”tosetaccordingtotheactualproductmodel.Click“Settings”to
completetheinitialparametersetting.
Theaboveparametershavebeenconfiguredbeforetheproductleavesthe
factory.
--End
SystemManual 8O&MonWEB
No. Description
E Languageswitchingoptions
F Usercenter
8.4.2ViewingFaultInformation
Step1Click“Overview”→“GeneralInformation”ontheleftnavigationbartoenterthe
homepage.
Step2Click
intheupper-rightcorneroftheinterfacetoviewinformationsuchasthenameand
timeofthefaultevent.
--End
8.4.3ViewingAlarmInformation
Step1Click“Overview”→“GeneralInformation”ontheleftnavigationbartoenterthe
homepage.
Step2Click
intheupper-rightcorneroftheinterfacetoviewinformationsuchasthenameand
timeofthefaultevent.
--End
8.4.4Boot/Shutdown
Step1Click“Overview”→“GeneralInformation”ontheleftnavigationbartoenterthe
homepage.
Step2ClickBootorShutdownintheShortcutMenu. TakingSG4400UDasanexample.
•Ifaninverterunitneedstobestarted,e.g.,Unit1,checkSG4400UD_Unit1andclick
Savetoturnontheunit.Ifthewholeinverterneedstobestarted,checktheinvertermod-
el,e.g.,SG4400UDandclickSavetoturnontheinverter.
•Ifaninverterunitneedstobeshutdown,e.g.,Unit1,checkSG4400UD_Unit1andclick
Savetoshutdowntheunit.Ifthewholeinverterneedstobeshutdown,checktheinver-
termodel,e.g.,SG4400UDandclickSavetoshutdowntheinverter.
--End
8.4.5SettingInitialParameters
Step1Click“DeviceMonitoring”intheleftnavigationbar.
Step2Pulldown“Country/Region”tosetaccordingtotheproductlocation,andpulldown
“MachineChoose”tosetaccordingtotheactualproductmodel.Click“Settings”to
completetheinitialparametersetting.
Theaboveparametershavebeenconfiguredbeforetheproductleavesthe
factory.
--End
SystemManual 8O&MonWEB
56
8.4.6SettingOperationParameters
Step1Click“DeviceMonitoring”intheleftnavigationbar.
Step2Selectadeviceintheleftdevicelistinthefunctiondisplayarea.Click“OperationPara-
meters”ontheright.enteravaluein“CurrentValue”, andthenclick“Settings”
Click“ConfigureSynchronization”to synchronizethesettingstootherdevices
ofthesametype.
--End
8.4.7SettingSystemParameters
Step1Click“DeviceMonitoring”intheleftnavigationbar.
Step2Selectadeviceintheleftdevicelistinthefunctiondisplayarea.Click“System
Parameters”ontheright.enteravaluein“CurrentValue”, andthenclick“Settings”
Click“ConfigureSynchronization”to synchronizethesettingstootherdevices
ofthesametype.
--End
8.4.8SettingProtectionParameters
Step1Click“Monitoring”intheleftnavigationbar.
Step2Selectadeviceintheleftdevicelistinthefunctiondisplayarea.Click“ProtectionPara-
meters”ontheright.enteravaluein“CurrentValue”, andthenclick“Settings”
Click“ConfigureSynchronization”to synchronizethesettingstootherdevices
ofthesametype
--End
8.5ModifyingPassword
PC
Click
intheupper-rightcorneroftheinterface,selectModifyPassword, entertheorigi-
nalpasswordandnewpassword,andclickSave.
MobileDevice
ThroughthePCinterface,selectSystem→WLAN→Password, deletetheoriginalpass-
word,andenterthenewpassword,clickSavetocompletethepasswordmodification.
Thepasswordshouldbeacombinationof6to32lettersanddigits.
Reconnectandloginafterpasswordchange.
8O&MonWEB SystemManual
8.4.6SettingOperationParameters
Step1Click“DeviceMonitoring”intheleftnavigationbar.
Step2Selectadeviceintheleftdevicelistinthefunctiondisplayarea.Click“OperationPara-
meters”ontheright.enteravaluein“CurrentValue”, andthenclick“Settings”
Click“ConfigureSynchronization”to synchronizethesettingstootherdevices
ofthesametype.
--End
8.4.7SettingSystemParameters
Step1Click“DeviceMonitoring”intheleftnavigationbar.
Step2Selectadeviceintheleftdevicelistinthefunctiondisplayarea.Click“System
Parameters”ontheright.enteravaluein“CurrentValue”, andthenclick“Settings”
Click“ConfigureSynchronization”to synchronizethesettingstootherdevices
ofthesametype.
--End
8.4.8SettingProtectionParameters
Step1Click“Monitoring”intheleftnavigationbar.
Step2Selectadeviceintheleftdevicelistinthefunctiondisplayarea.Click“ProtectionPara-
meters”ontheright.enteravaluein“CurrentValue”, andthenclick“Settings”
Click“ConfigureSynchronization”to synchronizethesettingstootherdevices
ofthesametype
--End
8.5ModifyingPassword
PC
Click
intheupper-rightcorneroftheinterface,selectModifyPassword, entertheorigi-
nalpasswordandnewpassword,andclickSave.
MobileDevice
ThroughthePCinterface,selectSystem→WLAN→Password, deletetheoriginalpass-
word,andenterthenewpassword,clickSavetocompletethepasswordmodification.
Thepasswordshouldbeacombinationof6to32lettersanddigits.
Reconnectandloginafterpasswordchange.
8O&MonWEB SystemManual
57
8.6Logout
Toprotecttheaccountsecurity,itisrecommendedtologoutintimeaftertheoperationis
completed.
ExitMethod
Click
andselectLogoutintheupperrightcornerofanyinterface.
SystemManual 8O&MonWEB
8.6Logout
Toprotecttheaccountsecurity,itisrecommendedtologoutintimeaftertheoperationis
completed.
ExitMethod
Click
andselectLogoutintheupperrightcornerofanyinterface.
SystemManual 8O&MonWEB
58
9Troubleshooting
Iftheinverterfailstooutputasexpectedorthepoweryieldchangesabnormally,checkthe
followingitemsbeforeconsultingSUNGROW:
•Theopen-circuitvoltageofPVarrays
•Whethertheemergencystopbuttonispressed
•Whethertheinverterlimitstheoutputofactivepower
Iftheproblemstillpersistsorthereareanyotherquestions,pleasecontactSUNGROW.It
wouldbehelpfulifthefollowinginformationisprovidedduringacall:
•ModelandS/Noftheinverterandinternalequipment
•ManufacturerandmodeloftheupstreamPVSandPVmodulesthatconnectedtothe
inverter
•Communicationandconnectionschemeoftheinverter
•Faultinformationandabriefdescriptionofthefault
•Picturesofthefaultoccurrencesite(ifon-siteconditionspermit)
9.1InverterTroubleshooting
9.1.1ViewingFault/AlarmInformation
Viewthefaultandalarminformationreferringto"8.4.2ViewingFaultInformation" and"8.4.3
ViewingAlarmInformation".
9.1.2CheckMethod
Therearethreelevelsofanomalies:
•Importantfault:Theinverterfails,shutsdown,andstopsgrid-connectedpower
generation.
•Secondaryfault:Somepartsoftheinverterfail,buttheinvertercanstillgeneratepower
inagrid-connectedstate.
•Promptforfault:Theinverterworksnormally,butitsoutputpowerdecreasesduetoex-
ternalfactors.
9Troubleshooting
Iftheinverterfailstooutputasexpectedorthepoweryieldchangesabnormally,checkthe
followingitemsbeforeconsultingSUNGROW:
•Theopen-circuitvoltageofPVarrays
•Whethertheemergencystopbuttonispressed
•Whethertheinverterlimitstheoutputofactivepower
Iftheproblemstillpersistsorthereareanyotherquestions,pleasecontactSUNGROW.It
wouldbehelpfulifthefollowinginformationisprovidedduringacall:
•ModelandS/Noftheinverterandinternalequipment
•ManufacturerandmodeloftheupstreamPVSandPVmodulesthatconnectedtothe
inverter
•Communicationandconnectionschemeoftheinverter
•Faultinformationandabriefdescriptionofthefault
•Picturesofthefaultoccurrencesite(ifon-siteconditionspermit)
9.1InverterTroubleshooting
9.1.1ViewingFault/AlarmInformation
Viewthefaultandalarminformationreferringto"8.4.2ViewingFaultInformation" and"8.4.3
ViewingAlarmInformation".
9.1.2CheckMethod
Therearethreelevelsofanomalies:
•Importantfault:Theinverterfails,shutsdown,andstopsgrid-connectedpower
generation.
•Secondaryfault:Somepartsoftheinverterfail,buttheinvertercanstillgeneratepower
inagrid-connectedstate.
•Promptforfault:Theinverterworksnormally,butitsoutputpowerdecreasesduetoex-
ternalfactors.
59
FaultName FaultCause FaultLevel CorrectiveMethod
Modulefault
Thedriveboard
generatesafault
signalorahard-
wareover-current
occurs.
Important
1.Checkwhetherashortcircuit
occursontheACorDCsidesof
theinverter.
2.Checkthegridforany
exceptions.
3.Checkwhethertheappear-
anceoftheinternalmoduleis
normal.
Contactorfault
Thecontactoris
faulty.
Important
DisconnecttheACandDCside
switchesoftheinverter,and
checkwhethertheappearance
oftheACcontactorisobviously
abnormalaftertheinverteris
completelydischarged.
ACcurrentim-
balancefault
ACcurrentis
unbalanced.
Important
Checkthegridforanomalies.
Checkifthereisaphaseloss.
Reactorover-
temperature
Thetemperature
ofthereactoris
excessivelyhigh.
Important
1.Useathermometertocheck
whetherthecurrentambient
temperatureiswithinthetem-
peraturerangeadvertisedbythe
inverter.
2.Checkwhethertheairinletof
theinverterandtheinverterunit
isnormal.Makesurethattheair
inletisnotblocked,andreplace
thefilterscreenifnecessary.
3.Intheshutdownstate,check
whethertheinternalcoolingfan
oftheinverterisstoppedbyfor-
eignobjects.
SystemManual 9Troubleshooting
FaultName FaultCause FaultLevel CorrectiveMethod
Modulefault
Thedriveboard
generatesafault
signalorahard-
wareover-current
occurs.
Important
1.Checkwhetherashortcircuit
occursontheACorDCsidesof
theinverter.
2.Checkthegridforany
exceptions.
3.Checkwhethertheappear-
anceoftheinternalmoduleis
normal.
Contactorfault
Thecontactoris
faulty.
Important
DisconnecttheACandDCside
switchesoftheinverter,and
checkwhethertheappearance
oftheACcontactorisobviously
abnormalaftertheinverteris
completelydischarged.
ACcurrentim-
balancefault
ACcurrentis
unbalanced.
Important
Checkthegridforanomalies.
Checkifthereisaphaseloss.
Reactorover-
temperature
Thetemperature
ofthereactoris
excessivelyhigh.
Important
1.Useathermometertocheck
whetherthecurrentambient
temperatureiswithinthetem-
peraturerangeadvertisedbythe
inverter.
2.Checkwhethertheairinletof
theinverterandtheinverterunit
isnormal.Makesurethattheair
inletisnotblocked,andreplace
thefilterscreenifnecessary.
3.Intheshutdownstate,check
whethertheinternalcoolingfan
oftheinverterisstoppedbyfor-
eignobjects.
SystemManual 9Troubleshooting
60
FaultName FaultCause FaultLevel CorrectiveMethod
Controlcabinet
temperature
fault
Thetemperature
insidethecontrol
cabinetisexces-
sivelyhigh
Important
1.Checkwhetherthegridvol-
tageisnormal.
2.Checkwhetherthecontrolfan
isnormal.
3.ChecktheACfiltersystem.
Checkwhetherthereareab-
normalitiesonthesurfaceofthe
ACfiltercapacitor,suchas
cracking.Ifnecessary,check
whetherthethree-phasecurrent
ofthecapacitorisbalanced.
DCunder-
voltage
DCinputvoltage
isexcessivelylow.
Important
1.Intheshutdownstate,check
whethertheDCvoltagedis-
playedontheinverterisconsis-
tentwiththemeasuredvalue.
2.Ifnot,checkwhethertheDC
sidecablesareshortedor
wronglyconnected.
DC(Bus)un-
der-voltage
DCbusvoltageis
excessivelylow.
Important
Pleaserefertothetroubleshoot-
ingmethodof“DCunder-
voltage”.
Neutralpoint
shift
Voltageexistsbe-
tweenthepositive
andnegative
polesoftheDC
sideoftheinverter
andtheneutral
pointpotential.
Important
1.CheckwhethertheDCside
voltageoftheinverterisshort-
circuited,whethertheinputvol-
tageexceedstheallowable
range,andwhetherthegridvol-
tageisabnormal.
2.CheckwhetherDCover-vol-
tage,DCunder-voltage,module
fault,ACover-current,andother
faultsexistatthesametimein
thehistoricalfaultinterface.Ifso,
refertothetroubleshooting
methodsofrelatedfaults.
9Troubleshooting SystemManual
FaultName FaultCause FaultLevel CorrectiveMethod
Controlcabinet
temperature
fault
Thetemperature
insidethecontrol
cabinetisexces-
sivelyhigh
Important
1.Checkwhetherthegridvol-
tageisnormal.
2.Checkwhetherthecontrolfan
isnormal.
3.ChecktheACfiltersystem.
Checkwhetherthereareab-
normalitiesonthesurfaceofthe
ACfiltercapacitor,suchas
cracking.Ifnecessary,check
whetherthethree-phasecurrent
ofthecapacitorisbalanced.
DCunder-
voltage
DCinputvoltage
isexcessivelylow.
Important
1.Intheshutdownstate,check
whethertheDCvoltagedis-
playedontheinverterisconsis-
tentwiththemeasuredvalue.
2.Ifnot,checkwhethertheDC
sidecablesareshortedor
wronglyconnected.
DC(Bus)un-
der-voltage
DCbusvoltageis
excessivelylow.
Important
Pleaserefertothetroubleshoot-
ingmethodof“DCunder-
voltage”.
Neutralpoint
shift
Voltageexistsbe-
tweenthepositive
andnegative
polesoftheDC
sideoftheinverter
andtheneutral
pointpotential.
Important
1.CheckwhethertheDCside
voltageoftheinverterisshort-
circuited,whethertheinputvol-
tageexceedstheallowable
range,andwhetherthegridvol-
tageisabnormal.
2.CheckwhetherDCover-vol-
tage,DCunder-voltage,module
fault,ACover-current,andother
faultsexistatthesametimein
thehistoricalfaultinterface.Ifso,
refertothetroubleshooting
methodsofrelatedfaults.
9Troubleshooting SystemManual
61
FaultName FaultCause FaultLevel CorrectiveMethod
Abnormal
temperature
Ifthetemperature
attheinverterinlet
exceedsthepro-
tectionthreshold,
thisfaultis
triggered.
Important
1.Checkwhethertheambient
temperatureisnormal;
Useathermometertocheck
whetherthecurrentambient
temperatureiswithinthetem-
peraturerangeadvertisedbythe
inverter.
2.Checkwhethertheairinletof
theinverterandtheinverterunit
isnormal;Makesurethattheair
inletisnotblocked,andreplace
thefilterscreenifnecessary.
3.Intheshutdownstate,check
whetherthecoolingfaninside
theinverter/inverterunitis
stoppedbyforeignobjects.
DCcabinet
over-
temperature
Thetemperature
insidetheDCca-
binetisexces-
sivelyhigh
Important
Refertothetroubleshooting
methodof“Abnormal
Temperature”.
Gridover-
voltage
Thegridvoltageis
higherthantheset
protectionvalue.
Important
1Checkwhethertheprotection
parametersinParameterSet-
tings->ProtectionParameters
meetthegridstandardsofthelo-
cationwheretheinverteris
installed.
2DisconnecttheACswitchand
measurewhethertheactualgrid
voltageiswithinthenormal
range.
3Intheshutdownstate,check
whetherthegridvoltagedis-
playedontheinverterisconsis-
tentwiththemeasuredvalue.
Gridunder-
voltage
Thegridvoltageis
lowerthantheset
protectionvalue.
Important
Refertothetroubleshooting
methodof"Gridover-voltage”.
SystemManual 9Troubleshooting
FaultName FaultCause FaultLevel CorrectiveMethod
Abnormal
temperature
Ifthetemperature
attheinverterinlet
exceedsthepro-
tectionthreshold,
thisfaultis
triggered.
Important
1.Checkwhethertheambient
temperatureisnormal;
Useathermometertocheck
whetherthecurrentambient
temperatureiswithinthetem-
peraturerangeadvertisedbythe
inverter.
2.Checkwhethertheairinletof
theinverterandtheinverterunit
isnormal;Makesurethattheair
inletisnotblocked,andreplace
thefilterscreenifnecessary.
3.Intheshutdownstate,check
whetherthecoolingfaninside
theinverter/inverterunitis
stoppedbyforeignobjects.
DCcabinet
over-
temperature
Thetemperature
insidetheDCca-
binetisexces-
sivelyhigh
Important
Refertothetroubleshooting
methodof“Abnormal
Temperature”.
Gridover-
voltage
Thegridvoltageis
higherthantheset
protectionvalue.
Important
1Checkwhethertheprotection
parametersinParameterSet-
tings->ProtectionParameters
meetthegridstandardsofthelo-
cationwheretheinverteris
installed.
2DisconnecttheACswitchand
measurewhethertheactualgrid
voltageiswithinthenormal
range.
3Intheshutdownstate,check
whetherthegridvoltagedis-
playedontheinverterisconsis-
tentwiththemeasuredvalue.
Gridunder-
voltage
Thegridvoltageis
lowerthantheset
protectionvalue.
Important
Refertothetroubleshooting
methodof"Gridover-voltage”.
SystemManual 9Troubleshooting
62
FaultName FaultCause FaultLevel CorrectiveMethod
Frequencyfault
Thegridfre-
quencyis
abnormal.
Important
1Checkwhethertheprotection
parametersontheinterface
meetthegridstandardsofthelo-
cationwheretheinverteris
installed.
2Intheshutdownstate,check
whetherthegridfrequencydis-
playedontheinverterisconsis-
tentwiththeactualvalue.
Islanding
protection
Thepowergrid
failsortheACin-
stantaneousvol-
tageexceedsthe
protection
threshold.
Important
1.Checkthegridforany
exceptions.
2.Checkwhetherashortcircuit
occursontheACsideofthe
inverter.
3.CheckwhethertheACcircuit
breakeroftheinvertersis
disconnected.
Controlpower
exception
Thecontrolpower
isabnormal.
Important
1Checkwhethertheinternal
andexternalpowersupplycon-
trolswitchesoftheinverterare
closedordisconnectedatthe
sametime.
Iftheyareclosedatthesame
time,pleasedisconnectoneof
theswitches.
Iftheyaredisconnectedatthe
sametime,pleasecloseoneof
theswitches.
2Checkwhethertheinternal
andexternalpowersupplyterm-
inalsarelooseorpoorlycon-
tacted.Tightenthemif
necessary.
DCvoltage
samplingfault
TheDCvoltage
samplingis
abnormal.
Important
Intheshutdownstate,check
whethertheDCvoltagedis-
playedontheinverterisconsis-
tentwiththemeasuredvalue.
9Troubleshooting SystemManual
FaultName FaultCause FaultLevel CorrectiveMethod
Frequencyfault
Thegridfre-
quencyis
abnormal.
Important
1Checkwhethertheprotection
parametersontheinterface
meetthegridstandardsofthelo-
cationwheretheinverteris
installed.
2Intheshutdownstate,check
whetherthegridfrequencydis-
playedontheinverterisconsis-
tentwiththeactualvalue.
Islanding
protection
Thepowergrid
failsortheACin-
stantaneousvol-
tageexceedsthe
protection
threshold.
Important
1.Checkthegridforany
exceptions.
2.Checkwhetherashortcircuit
occursontheACsideofthe
inverter.
3.CheckwhethertheACcircuit
breakeroftheinvertersis
disconnected.
Controlpower
exception
Thecontrolpower
isabnormal.
Important
1Checkwhethertheinternal
andexternalpowersupplycon-
trolswitchesoftheinverterare
closedordisconnectedatthe
sametime.
Iftheyareclosedatthesame
time,pleasedisconnectoneof
theswitches.
Iftheyaredisconnectedatthe
sametime,pleasecloseoneof
theswitches.
2Checkwhethertheinternal
andexternalpowersupplyterm-
inalsarelooseorpoorlycon-
tacted.Tightenthemif
necessary.
DCvoltage
samplingfault
TheDCvoltage
samplingis
abnormal.
Important
Intheshutdownstate,check
whethertheDCvoltagedis-
playedontheinverterisconsis-
tentwiththemeasuredvalue.
9Troubleshooting SystemManual
63
FaultName FaultCause FaultLevel CorrectiveMethod
Softstartfault
Theinverterfails
tostart.
Important
Checkwhetherthepowergridis
abnormal,suchasharmonics
andvoltagebalance.
DCSPDfault
TheDCsideSPD
oftheinverterfails.
Important
Checkthestatusindicatorofthe
SPD.
1.Iftheindicatorchangesfrom
greentored,theSPDisda-
maged.Itmaybecausedbylo-
calthunderstorms.Measurethe
ACandDCvoltageandcurrent.
Ifvoltagesbetweenthepositive
andnegativepolestotheground
arenormal,replacetheSPD.
2.Iftheindicatorisnormal,the
SPDmaybeinpoorcontactwith
itsholder.ReplugtheSPDand
tightenit.
ACSPDfault
TheACsideSPD
oftheinverterfails.
Important
1.Refertothetroubleshooting
methodof"DCSPDfault"tocon-
ductpreliminarytroubleshooting.
2.Checkwhethertheminiature
circuitbreakerisconnectedin
serieswiththeSPDtrips.
3.Ifnot,measuretheACand
DCvoltageandcurrent.Ensure
thatthereisnoexception,and
closetheminiaturecircuitbreak-
eragain.
SystemManual 9Troubleshooting
FaultName FaultCause FaultLevel CorrectiveMethod
Softstartfault
Theinverterfails
tostart.
Important
Checkwhetherthepowergridis
abnormal,suchasharmonics
andvoltagebalance.
DCSPDfault
TheDCsideSPD
oftheinverterfails.
Important
Checkthestatusindicatorofthe
SPD.
1.Iftheindicatorchangesfrom
greentored,theSPDisda-
maged.Itmaybecausedbylo-
calthunderstorms.Measurethe
ACandDCvoltageandcurrent.
Ifvoltagesbetweenthepositive
andnegativepolestotheground
arenormal,replacetheSPD.
2.Iftheindicatorisnormal,the
SPDmaybeinpoorcontactwith
itsholder.ReplugtheSPDand
tightenit.
ACSPDfault
TheACsideSPD
oftheinverterfails.
Important
1.Refertothetroubleshooting
methodof"DCSPDfault"tocon-
ductpreliminarytroubleshooting.
2.Checkwhethertheminiature
circuitbreakerisconnectedin
serieswiththeSPDtrips.
3.Ifnot,measuretheACand
DCvoltageandcurrent.Ensure
thatthereisnoexception,and
closetheminiaturecircuitbreak-
eragain.
SystemManual 9Troubleshooting
64
FaultName FaultCause FaultLevel CorrectiveMethod
DCover-
voltage
TheDCsidevol-
tageoftheinverter
exceedsthepro-
tectionthreshold.
Important
DisconnecttheDCswitchofthe
inverterandcheckwhetherthe
open-circuitvoltageofthePVar-
raysisnormal;Ifnot,thePVar-
rayconfigurationmaybefaulty.
2.CheckandensurethattheAC
sidetransformerisconnectedin
a“Y”shape,andthattheneutral
pointisnotgrounded.
3.Intheshutdownstate,check
whethertheDCvoltagedis-
playedontheinverterisconsis-
tentwiththemeasuredvalue.
PVpolarity
reversal
Thepolarityofthe
positiveandnega-
tivepolesofthe
PVstringsis
reversed.
Important
CheckwhethertheDCside
cablesoftheinverterarecon-
nectedreversely.
Hardwarefault
Inverterinternal
hardwarefault
Important
MeasuretheDCvoltageofthe
inverterandcheckwhethera
shortcircuitoccursintheinverter.
ACover-current
ACsidecurrentof
theinverterisex-
cessivelyhigh.
Important
1.Checkwhethercablesonthe
ACandDCsidesoftheinverter
areloose.
2.Checkwhethertheinsulation
layerofcablesisdamaged.
3.Checkwhetherterminalsare
short-circuitedandgrounded.
Overload
protection
Theoutputofthe
inverterexceeds
theloadlimit.
Important
Refertothetroubleshooting
methodof"ACover-current”.
ACleakage
current
protection
Theleakagecur-
rentsamplingva-
lueontheACside
oftheinverterex-
ceedstheprotec-
tionthreshold.
Important
1.CheckwhethertheACcable
isdamaged.
2.IftheLVsideofthetransfor-
merisconnectedina“Y”shape,
ensurethattheneutralpointis
notconnected.
9Troubleshooting SystemManual
FaultName FaultCause FaultLevel CorrectiveMethod
DCover-
voltage
TheDCsidevol-
tageoftheinverter
exceedsthepro-
tectionthreshold.
Important
DisconnecttheDCswitchofthe
inverterandcheckwhetherthe
open-circuitvoltageofthePVar-
raysisnormal;Ifnot,thePVar-
rayconfigurationmaybefaulty.
2.CheckandensurethattheAC
sidetransformerisconnectedin
a“Y”shape,andthattheneutral
pointisnotgrounded.
3.Intheshutdownstate,check
whethertheDCvoltagedis-
playedontheinverterisconsis-
tentwiththemeasuredvalue.
PVpolarity
reversal
Thepolarityofthe
positiveandnega-
tivepolesofthe
PVstringsis
reversed.
Important
CheckwhethertheDCside
cablesoftheinverterarecon-
nectedreversely.
Hardwarefault
Inverterinternal
hardwarefault
Important
MeasuretheDCvoltageofthe
inverterandcheckwhethera
shortcircuitoccursintheinverter.
ACover-current
ACsidecurrentof
theinverterisex-
cessivelyhigh.
Important
1.Checkwhethercablesonthe
ACandDCsidesoftheinverter
areloose.
2.Checkwhethertheinsulation
layerofcablesisdamaged.
3.Checkwhetherterminalsare
short-circuitedandgrounded.
Overload
protection
Theoutputofthe
inverterexceeds
theloadlimit.
Important
Refertothetroubleshooting
methodof"ACover-current”.
ACleakage
current
protection
Theleakagecur-
rentsamplingva-
lueontheACside
oftheinverterex-
ceedstheprotec-
tionthreshold.
Important
1.CheckwhethertheACcable
isdamaged.
2.IftheLVsideofthetransfor-
merisconnectedina“Y”shape,
ensurethattheneutralpointis
notconnected.
9Troubleshooting SystemManual
65
FaultName FaultCause FaultLevel CorrectiveMethod
Moduleover-
temperature
Thetemperature
ofmodulesinside
theinverterisex-
cessivelyhigh.
Important
1.Checktheairinlet.
2.Checkwhethertheairoutlet
oftheinverterisblocked.Re-
placetheairfilterscreenif
necessary.
3.Checkwhetherthecoolingfan
isrunningduringtheoperationof
theinverter.
Fan/
Fan2
exception
Fan/fan2inside
theinverterfails.
Important
1.Checkwhetherthegridvol-
tageisnormal.Useamultimeter
tomeasurethegridvoltageand
checkforphaseloss.
2.Checkwhetherthepowersup-
plyofthecoolingfanisnormal.
Useamultimetertomeasurethe
three-phasepowersupplytoen-
surethattheratedinputvoltage
is400Vac.
Groundingfault
Agroundingfault
occurs.
Important
1ChecktheDCcables.
Checkwhetherthepositive
groundingcableofeachDC
branchisdamaged.
CheckwhethertheDCcablere-
sistancetothegroundisnormal.
2CheckACcables.
Measurethethree-phasevol-
tagetogroundandobserve
whetherthevoltagevalueisthe
same.Checktheinverterand
thebox-typesubstationside
SPDfordamage.
SystemManual 9Troubleshooting
FaultName FaultCause FaultLevel CorrectiveMethod
Moduleover-
temperature
Thetemperature
ofmodulesinside
theinverterisex-
cessivelyhigh.
Important
1.Checktheairinlet.
2.Checkwhethertheairoutlet
oftheinverterisblocked.Re-
placetheairfilterscreenif
necessary.
3.Checkwhetherthecoolingfan
isrunningduringtheoperationof
theinverter.
Fan/
Fan2
exception
Fan/fan2inside
theinverterfails.
Important
1.Checkwhetherthegridvol-
tageisnormal.Useamultimeter
tomeasurethegridvoltageand
checkforphaseloss.
2.Checkwhetherthepowersup-
plyofthecoolingfanisnormal.
Useamultimetertomeasurethe
three-phasepowersupplytoen-
surethattheratedinputvoltage
is400Vac.
Groundingfault
Agroundingfault
occurs.
Important
1ChecktheDCcables.
Checkwhetherthepositive
groundingcableofeachDC
branchisdamaged.
CheckwhethertheDCcablere-
sistancetothegroundisnormal.
2CheckACcables.
Measurethethree-phasevol-
tagetogroundandobserve
whetherthevoltagevalueisthe
same.Checktheinverterand
thebox-typesubstationside
SPDfordamage.
SystemManual 9Troubleshooting
66
FaultName FaultCause FaultLevel CorrectiveMethod
ACswitchfaultACswitchfails.Important
1.CheckwhethertheACswitch
trips.
2.Checkwhethertheappear-
anceoftheswitchisnormal.
3.CheckwhethertheACswitch
canbenormallyclosed/
disconnected.
4.Useamultimetertomeasure
whethertheACswitchnormally
controlstheon/offofthecircuit.
Heatsinkover-
temperature
Thetemperature
oftheheatsinkin-
sidetheinverteris
excessivelyhigh.
Important
Checkwhetherthecoolingfanis
normal.Ifso,checktheairduct
forblockage.
GFDI-pro
TheDCgrounding
protectionfails.
Important
1.Thenegativeterminalofthe
inverterisnotreliablygrounded.
2.Checkwhetherthenegative
groundingfuseisblown.
ACfusefault
Thefuseonthe
ACsideofthein-
verterfails.
Important
CheckwhethertheACfuseis
normal.
Gridvoltage
imbalance
Gridvoltageis
unbalanced.
Important
Measurethegridvoltageand
checkforanyimbalance.
CurrentImbal-
ance2/Current
Imbalance3
Thealternating
currentis
unbalanced.
Important
Measurethegridvoltageand
checkforphaseloss.
ACcabinet
over-
temperature
Thetemperature
oftheACcabinet
exceedsthepro-
tectionthreshold.
Important
1.Checkwhetherthefansinside
theACcabinetworknormally.
2.Checkwhethertheairinletof
theACcabinetisblocked.
3.Checkwhetherthereisdustin
theairinletoftheACcabinet.
Cleanitifnecessary.
DCfuse
anomaly
Thefuseonthe
DCsideofthein-
verterfails.
Secondary
CheckwhethertheDCfuseis
blown.
Ifso,pleasecontactSUNGROW
toreplacethefuse.
9Troubleshooting SystemManual
FaultName FaultCause FaultLevel CorrectiveMethod
ACswitchfaultACswitchfails.Important
1.CheckwhethertheACswitch
trips.
2.Checkwhethertheappear-
anceoftheswitchisnormal.
3.CheckwhethertheACswitch
canbenormallyclosed/
disconnected.
4.Useamultimetertomeasure
whethertheACswitchnormally
controlstheon/offofthecircuit.
Heatsinkover-
temperature
Thetemperature
oftheheatsinkin-
sidetheinverteris
excessivelyhigh.
Important
Checkwhetherthecoolingfanis
normal.Ifso,checktheairduct
forblockage.
GFDI-pro
TheDCgrounding
protectionfails.
Important
1.Thenegativeterminalofthe
inverterisnotreliablygrounded.
2.Checkwhetherthenegative
groundingfuseisblown.
ACfusefault
Thefuseonthe
ACsideofthein-
verterfails.
Important
CheckwhethertheACfuseis
normal.
Gridvoltage
imbalance
Gridvoltageis
unbalanced.
Important
Measurethegridvoltageand
checkforanyimbalance.
CurrentImbal-
ance2/Current
Imbalance3
Thealternating
currentis
unbalanced.
Important
Measurethegridvoltageand
checkforphaseloss.
ACcabinet
over-
temperature
Thetemperature
oftheACcabinet
exceedsthepro-
tectionthreshold.
Important
1.Checkwhetherthefansinside
theACcabinetworknormally.
2.Checkwhethertheairinletof
theACcabinetisblocked.
3.Checkwhetherthereisdustin
theairinletoftheACcabinet.
Cleanitifnecessary.
DCfuse
anomaly
Thefuseonthe
DCsideofthein-
verterfails.
Secondary
CheckwhethertheDCfuseis
blown.
Ifso,pleasecontactSUNGROW
toreplacethefuse.
9Troubleshooting SystemManual
67
FaultName FaultCause FaultLevel CorrectiveMethod
Anti-PIDpower
abnormality
Theanti-PID
powerisabnormal.
Secondary
1.ChecktheinsulationofAC
cables.
2.ChecktheACSPD.
3.Checkandmakesurethatthe
neutralpointontheLVsideof
thebox-typesubstationisnot
grounded.
Externalpower
supply
abnormal
Theexternal
powersupplyis
abnormal.
Secondary
Useamultimetertomeasure
andcheckwhetherthevoltage
oftheexternalpowersupplyis
abnormal.
Branchair
switch
abnormal
Theairswitchof
theDCbranchof
theinverteris
abnormal.
Secondary
Checkwhetherthebranchair
switchesareallclosed,and
checkwhetherthestateofthem
isClosedontheinterface.
CTimbalance
Thethree-phase
gridcurrentisout
ofbalance.
Secondary
Checkwhetherthethree-phase
ACcurrentisbalancedonthe
interface.
Groundingfuse
anomaly
Thegrounding
fuseisabnormal.
Secondary
Removethenegativegrounding
fuseaftertheinverterisfullydis-
charged.Checkwhetherthis
fuseisblown.
Ifso,checkwhethertheneutral
pointofthetransformerisnot
connectedandwhethertheneu-
tralpointofPT/CTontheLVside
ofthebox-typesubstationis
grounded.
Metercommu-
nicationabnor-
malalarm
Themetercom-
municationis
abnormal.
Secondary
1.Checkwhetherthecommuni-
cationcableofthemeteris
damaged.
2.Checkthecommunication
terminalofthemeterisloose.
DCfusefault
Thefuseonthe
DCsideofthein-
verterfails.
Secondary
CheckwhethertheDCfuseis
blown.
Ifso,pleasecontactSUNGROW
toreplacethefuse.
SystemManual 9Troubleshooting
FaultName FaultCause FaultLevel CorrectiveMethod
Anti-PIDpower
abnormality
Theanti-PID
powerisabnormal.
Secondary
1.ChecktheinsulationofAC
cables.
2.ChecktheACSPD.
3.Checkandmakesurethatthe
neutralpointontheLVsideof
thebox-typesubstationisnot
grounded.
Externalpower
supply
abnormal
Theexternal
powersupplyis
abnormal.
Secondary
Useamultimetertomeasure
andcheckwhetherthevoltage
oftheexternalpowersupplyis
abnormal.
Branchair
switch
abnormal
Theairswitchof
theDCbranchof
theinverteris
abnormal.
Secondary
Checkwhetherthebranchair
switchesareallclosed,and
checkwhetherthestateofthem
isClosedontheinterface.
CTimbalance
Thethree-phase
gridcurrentisout
ofbalance.
Secondary
Checkwhetherthethree-phase
ACcurrentisbalancedonthe
interface.
Groundingfuse
anomaly
Thegrounding
fuseisabnormal.
Secondary
Removethenegativegrounding
fuseaftertheinverterisfullydis-
charged.Checkwhetherthis
fuseisblown.
Ifso,checkwhethertheneutral
pointofthetransformerisnot
connectedandwhethertheneu-
tralpointofPT/CTontheLVside
ofthebox-typesubstationis
grounded.
Metercommu-
nicationabnor-
malalarm
Themetercom-
municationis
abnormal.
Secondary
1.Checkwhetherthecommuni-
cationcableofthemeteris
damaged.
2.Checkthecommunication
terminalofthemeterisloose.
DCfusefault
Thefuseonthe
DCsideofthein-
verterfails.
Secondary
CheckwhethertheDCfuseis
blown.
Ifso,pleasecontactSUNGROW
toreplacethefuse.
SystemManual 9Troubleshooting
68
FaultName FaultCause FaultLevel CorrectiveMethod
Branchfuse
abnormal
Thebranchfuse
oftheinverteris
abnormal.
Secondary
Pleaserefertothetroubleshoot-
ingmethodof“DCfusefault”.
Lowinsulation
resistance
Theinsulationre-
sistanceislow.
Secondary
Pleaserefertothetroubleshoot-
ingmethodof“Insulation
resistance”.
DCswitch
anomaly
TheDCswitchof
theinverteris
abnormal.
Secondary
Checkwhetherthebranchair
switchesareallclosed,and
checkwhetherthestateofthem
isClosedontheinterface.
Frequencyde-
viationactive
power
regulation
Theactivepower
oftheinverteris
regulatedaccord-
ingtothechange
ofthegrid
frequency.
Prompt
Checkwhetherthepowerreduc-
tionatover-frequencyisenabled
ontheinterface.
Ifso,itindicatesthatover-fre-
quencyoccursduringoperation.
Voltagedevia-
tionreactive
power
regulation
Thereactive
poweroftheinver-
terisregulatedac-
cordingtothe
changeofthegrid
voltage.
Prompt
Checkwhetherthereactive
powerregulationissettoQU
Modeontheinterface.
GFRToperation
Theinverterruns
throughhighvol-
tageandlow
voltage.
Prompt
Checkwhetherthegridvoltage
exceedsthesetthresholdof
HVRTorLVRT.
Ifthefault/alarmcannotbeclearedfollowingtheabovecorrectivemethodsandstillpersists,
pleasecontactSUNGROW directly.
FaultName FaultCause FaultLevelCorrectiveMethod
ACswitchoff
TheACswitchis
disconnected.
Important
Pleasecontact
SUNGROW.
Carriersyncflt
Thecarriersignaltransmis-
sionisabnormal.
Important
Pleasecontact
SUNGROW.
Driveboardfault
Thedriveboardinsidethe
inverterfails.
Important
Pleasecontact
SUNGROW.
Parallelmachine
communication
failure
Thecommunicationinside
theinverterisabnormal.
Important
Pleasecontact
SUNGROW.
9Troubleshooting SystemManual
FaultName FaultCause FaultLevel CorrectiveMethod
Branchfuse
abnormal
Thebranchfuse
oftheinverteris
abnormal.
Secondary
Pleaserefertothetroubleshoot-
ingmethodof“DCfusefault”.
Lowinsulation
resistance
Theinsulationre-
sistanceislow.
Secondary
Pleaserefertothetroubleshoot-
ingmethodof“Insulation
resistance”.
DCswitch
anomaly
TheDCswitchof
theinverteris
abnormal.
Secondary
Checkwhetherthebranchair
switchesareallclosed,and
checkwhetherthestateofthem
isClosedontheinterface.
Frequencyde-
viationactive
power
regulation
Theactivepower
oftheinverteris
regulatedaccord-
ingtothechange
ofthegrid
frequency.
Prompt
Checkwhetherthepowerreduc-
tionatover-frequencyisenabled
ontheinterface.
Ifso,itindicatesthatover-fre-
quencyoccursduringoperation.
Voltagedevia-
tionreactive
power
regulation
Thereactive
poweroftheinver-
terisregulatedac-
cordingtothe
changeofthegrid
voltage.
Prompt
Checkwhetherthereactive
powerregulationissettoQU
Modeontheinterface.
GFRToperation
Theinverterruns
throughhighvol-
tageandlow
voltage.
Prompt
Checkwhetherthegridvoltage
exceedsthesetthresholdof
HVRTorLVRT.
Ifthefault/alarmcannotbeclearedfollowingtheabovecorrectivemethodsandstillpersists,
pleasecontactSUNGROW directly.
FaultName FaultCause FaultLevelCorrectiveMethod
ACswitchoff
TheACswitchis
disconnected.
Important
Pleasecontact
SUNGROW.
Carriersyncflt
Thecarriersignaltransmis-
sionisabnormal.
Important
Pleasecontact
SUNGROW.
Driveboardfault
Thedriveboardinsidethe
inverterfails.
Important
Pleasecontact
SUNGROW.
Parallelmachine
communication
failure
Thecommunicationinside
theinverterisabnormal.
Important
Pleasecontact
SUNGROW.
9Troubleshooting SystemManual
69
FaultName FaultCause FaultLevelCorrectiveMethod
Machinecodere-
petitionfault
Theaddressesoftheinver-
terunitsinsidetheinverter
arethesame.
Important
Pleasecontact
SUNGROW.
Temperatureand
humidityboard
communication
abnormal
Thecommunicationofthe
temperatureandhumidity
boardisabnormal.
Secondary
Pleasecontact
SUNGROW.
Branchreverse
over-current
Thebranchreversecurrent
isexcessivelylarge.
Secondary
Pleasecontact
SUNGROW.
DSPcommunica-
tionexception
Thecommunicationbe-
tweeninverterinternalcon-
trolboardandsmartunit
boardisabnormal.
Secondary
Pleasecontact
SUNGROW.
SystemManual 9Troubleshooting
FaultName FaultCause FaultLevelCorrectiveMethod
Machinecodere-
petitionfault
Theaddressesoftheinver-
terunitsinsidetheinverter
arethesame.
Important
Pleasecontact
SUNGROW.
Temperatureand
humidityboard
communication
abnormal
Thecommunicationofthe
temperatureandhumidity
boardisabnormal.
Secondary
Pleasecontact
SUNGROW.
Branchreverse
over-current
Thebranchreversecurrent
isexcessivelylarge.
Secondary
Pleasecontact
SUNGROW.
DSPcommunica-
tionexception
Thecommunicationbe-
tweeninverterinternalcon-
trolboardandsmartunit
boardisabnormal.
Secondary
Pleasecontact
SUNGROW.
SystemManual 9Troubleshooting
70
9.2OtherFaults
FaultDetail PossibleCause CorrectiveMethod
Theinvertershuts
downshortlyafter
startup
TheDCinputvoltageis
justenoughtostartthe
inverter.Iftheinverteris
connectedtoloads,and
thevoltagecannotmeet
therequirements,caus-
ingtheinvertertoshut
down.
Designandconnectthebatterypa-
nelseriesbasedontherecom-
mendedopen-circuitvoltage,
increasetheDCvoltageinput,and
avoidapplyingthecriticalvoltage
value.
Uppercomputercom-
municationfailure
Therearemanypossible
reasons,pleasecheck
onebyoneaccordingto
thedescriptionof"Cor-
rectiveMethod”.
Checkwhetherthelocaladdress,
baudrate,andotherparameterson
theinterfaceareconsistentwith
thoseonthehostcomputer.
Checkwhetherallwiringisgood.If
RS485communicationisadopted,
checkwhethertheAandBterminals
areconnectedreversely.
Replacethecommunicationadapter
andtryagainifthecommunication
adapterdoesnotmatch.
Ifthefaultisnotcausedbythefore-
goingreasonsandstillpersists,
pleasecontactSUNGROW assoon
aspossible.
WiFiconnectionunre-
sponsive/failed
Equipmentisnot
compatible.
1.RefreshtheWebpagemanually.
2.Restartorreplacethemobilede-
viceandtryconnectingagain.
3.Poweroffandrestarttheinverter
toconnectagain.
9Troubleshooting SystemManual
9.2OtherFaults
FaultDetail PossibleCause CorrectiveMethod
Theinvertershuts
downshortlyafter
startup
TheDCinputvoltageis
justenoughtostartthe
inverter.Iftheinverteris
connectedtoloads,and
thevoltagecannotmeet
therequirements,caus-
ingtheinvertertoshut
down.
Designandconnectthebatterypa-
nelseriesbasedontherecom-
mendedopen-circuitvoltage,
increasetheDCvoltageinput,and
avoidapplyingthecriticalvoltage
value.
Uppercomputercom-
municationfailure
Therearemanypossible
reasons,pleasecheck
onebyoneaccordingto
thedescriptionof"Cor-
rectiveMethod”.
Checkwhetherthelocaladdress,
baudrate,andotherparameterson
theinterfaceareconsistentwith
thoseonthehostcomputer.
Checkwhetherallwiringisgood.If
RS485communicationisadopted,
checkwhethertheAandBterminals
areconnectedreversely.
Replacethecommunicationadapter
andtryagainifthecommunication
adapterdoesnotmatch.
Ifthefaultisnotcausedbythefore-
goingreasonsandstillpersists,
pleasecontactSUNGROW assoon
aspossible.
WiFiconnectionunre-
sponsive/failed
Equipmentisnot
compatible.
1.RefreshtheWebpagemanually.
2.Restartorreplacethemobilede-
viceandtryconnectingagain.
3.Poweroffandrestarttheinverter
toconnectagain.
9Troubleshooting SystemManual
71
FaultDetail PossibleCause CorrectiveMethod
Failedisdisplayedon
theoperationorpro-
tectionparameterset-
tinginterfaces
Therearemanypossible
reasons,pleasecheck
onebyoneaccordingto
thedescriptionof"Cor-
rectiveMethod”.
1.Checkwhetheraninverterunit
cannotworknormally.
2.Checkwhethertheinverterunit
thatworksnormallycannormallyac-
ceptinstructions.
3.Pleaserefertothetroubleshooting
methodof“DSPcommunication
fault”.
Ifthefaultisnotcausedbythefore-
goingreasonsandstillpersists,
pleasecontactSUNGROW assoon
aspossible.
Failtoexportmeasur-
ingpointlogsin
batches
Theamountofdataex-
portedatasingletimeis
toolarge.
1.Exportdatainbatchesmultiple
times.
2.Thetimeintervalforexporting
datashallnotexceed7days.
SystemManual 9Troubleshooting
FaultDetail PossibleCause CorrectiveMethod
Failedisdisplayedon
theoperationorpro-
tectionparameterset-
tinginterfaces
Therearemanypossible
reasons,pleasecheck
onebyoneaccordingto
thedescriptionof"Cor-
rectiveMethod”.
1.Checkwhetheraninverterunit
cannotworknormally.
2.Checkwhethertheinverterunit
thatworksnormallycannormallyac-
ceptinstructions.
3.Pleaserefertothetroubleshooting
methodof“DSPcommunication
fault”.
Ifthefaultisnotcausedbythefore-
goingreasonsandstillpersists,
pleasecontactSUNGROW assoon
aspossible.
Failtoexportmeasur-
ingpointlogsin
batches
Theamountofdataex-
portedatasingletimeis
toolarge.
1.Exportdatainbatchesmultiple
times.
2.Thetimeintervalforexporting
datashallnotexceed7days.
SystemManual 9Troubleshooting
72
10RoutineMaintenance
10.1SafetyInstructions
Riskofinverterdamageorpersonalinjuryduetoincorrectservice!
•Disconnecttheswitchesbetweentheproductandallpowersuppliesbefore
maintenance.
•Aftertheinverterispoweredofffor20minutes,measurethevoltageandcur-
rentwithmeasuringequipment.Onlywhenthereisnovoltagenorcurrentcan
operatorswhowearprotectiveequipmentoperateandmaintaintheinverter.
Thedevicesinsidetheinvertercarryhighvoltage.Touchingthesedevicesmay
leadtofatalelectricshock.
Therefore,
•Livelinemeasurementcanonlybeperformedbyprofessionalpersonnelwho
knowthePVsystemwell.Beforemeasurement,besuretotakeproperprotec-
tionmethods(e.g.,wearinsulatinggloves,etc.).
•Duringlivelinemeasurement,theoperatormustbeaccompaniedbyothersto
ensurepersonalsafety.
Electricshockorfiremayoccurduetodevicedamageorsystemfault.
•Visuallyinspectfordevicedamagesorotherhazardsbeforetheoperation
•Checkwhetherotherexternaldevicesorcircuitconnectionsareinasafestate.
•Makesurethedeviceisinasafestatebeforeoperating.
10RoutineMaintenance
10.1SafetyInstructions
Riskofinverterdamageorpersonalinjuryduetoincorrectservice!
•Disconnecttheswitchesbetweentheproductandallpowersuppliesbefore
maintenance.
•Aftertheinverterispoweredofffor20minutes,measurethevoltageandcur-
rentwithmeasuringequipment.Onlywhenthereisnovoltagenorcurrentcan
operatorswhowearprotectiveequipmentoperateandmaintaintheinverter.
Thedevicesinsidetheinvertercarryhighvoltage.Touchingthesedevicesmay
leadtofatalelectricshock.
Therefore,
•Livelinemeasurementcanonlybeperformedbyprofessionalpersonnelwho
knowthePVsystemwell.Beforemeasurement,besuretotakeproperprotec-
tionmethods(e.g.,wearinsulatinggloves,etc.).
•Duringlivelinemeasurement,theoperatormustbeaccompaniedbyothersto
ensurepersonalsafety.
Electricshockorfiremayoccurduetodevicedamageorsystemfault.
•Visuallyinspectfordevicedamagesorotherhazardsbeforetheoperation
•Checkwhetherotherexternaldevicesorcircuitconnectionsareinasafestate.
•Makesurethedeviceisinasafestatebeforeoperating.
73
Ifsomedevicesneedtobereplacedduringoperationandmaintenance,please
contactSUNGROW.
Donotopenthedoortomaintaintheproductonrainy,humid,orwindydays.SUN-
GROWshallnotbeheldliableforanydamagecausedbyaviolationofthenotice.
Forproductswithlongdowntime,acomprehensiveanddetailedinspectionofthe
productsmustbecarriedoutbeforepoweringuptheproduct.First,theproduct
andinternalequipmentaswellasthefilmattheairinletandoutletneedtobe
checkedforintactness.Thentheproductshouldbecheckedandtestedbyprofes-
sionalsbeforecommissioning.
Donotopenthedoortomaintaintheproductonrainy,humid,orwindydays.SUN-
GROWshallnotbeheldliableforanydamagecausedbyaviolationofthenotice.
Waitforatleast20minutesaftershutdownandthenopenthecabinetdoor.Make
surethattheinsideoftheproductiscompletelyunchargedbeforemaintainingthe
product.
Donotleavescrews,washers,orothermetalpartsintheinverterafterthemainte-
nancework.Otherwise,damagemaybecausedtotheproduct!
Toavoidtheriskofelectricshock,donotperformanyothermaintenanceopera-
tionsbeyondthosedescribedinthismanual.Ifnecessary,contactSUNGROW for
maintenance.Otherwise,thelossescausedarenotcoveredbythewarranty.
Topreventmisuseoraccidentscausedbyunrelatedpersonnel,postprominent
warningsignsordemarcatesafetywarningareasaroundthedevicetopreventac-
cidentscausedbymisuse.
SystemManual 10RoutineMaintenance
Ifsomedevicesneedtobereplacedduringoperationandmaintenance,please
contactSUNGROW.
Donotopenthedoortomaintaintheproductonrainy,humid,orwindydays.SUN-
GROWshallnotbeheldliableforanydamagecausedbyaviolationofthenotice.
Forproductswithlongdowntime,acomprehensiveanddetailedinspectionofthe
productsmustbecarriedoutbeforepoweringuptheproduct.First,theproduct
andinternalequipmentaswellasthefilmattheairinletandoutletneedtobe
checkedforintactness.Thentheproductshouldbecheckedandtestedbyprofes-
sionalsbeforecommissioning.
Donotopenthedoortomaintaintheproductonrainy,humid,orwindydays.SUN-
GROWshallnotbeheldliableforanydamagecausedbyaviolationofthenotice.
Waitforatleast20minutesaftershutdownandthenopenthecabinetdoor.Make
surethattheinsideoftheproductiscompletelyunchargedbeforemaintainingthe
product.
Donotleavescrews,washers,orothermetalpartsintheinverterafterthemainte-
nancework.Otherwise,damagemaybecausedtotheproduct!
Toavoidtheriskofelectricshock,donotperformanyothermaintenanceopera-
tionsbeyondthosedescribedinthismanual.Ifnecessary,contactSUNGROW for
maintenance.Otherwise,thelossescausedarenotcoveredbythewarranty.
Topreventmisuseoraccidentscausedbyunrelatedpersonnel,postprominent
warningsignsordemarcatesafetywarningareasaroundthedevicetopreventac-
cidentscausedbymisuse.
SystemManual 10RoutineMaintenance
74
10.2MaintenancePeriod
10.2.1Maintenance(OnceEveryThreeYears)
Item Checkmethod
Monitoringandprotective
equipmentofthetransformer
•Oilthermometer:Alarmtemperatureandtripping
temperature.
•Pressurereliefvalve:Checkwhetherthepressurere-
liefvalveisingoodcontact.
•Oillevel:Checkwhethertheoillevelisatanormal
range.
•Pressuregauge:Checkifthepressuregaugeis
normal.
Transformeroilleakage
Checkthesecomponentsforoilleakage:
•De-energizedtap-changer
•Pressuregauge
•Oillevelgauge
•Oiltemperaturegauge
•Sleeve
•Pressurereliefvalveandsampleoil
•Sealingpart
10RoutineMaintenance SystemManual
10.2MaintenancePeriod
10.2.1Maintenance(OnceEveryThreeYears)
Item Checkmethod
Monitoringandprotective
equipmentofthetransformer
•Oilthermometer:Alarmtemperatureandtripping
temperature.
•Pressurereliefvalve:Checkwhetherthepressurere-
liefvalveisingoodcontact.
•Oillevel:Checkwhethertheoillevelisatanormal
range.
•Pressuregauge:Checkifthepressuregaugeis
normal.
Transformeroilleakage
Checkthesecomponentsforoilleakage:
•De-energizedtap-changer
•Pressuregauge
•Oillevelgauge
•Oiltemperaturegauge
•Sleeve
•Pressurereliefvalveandsampleoil
•Sealingpart
10RoutineMaintenance SystemManual
75
10.2.2Maintenance(Everytwoyears)
Item Checkmethod
Systemstatusandcleaning
Checkthefollowingitems,andcorrectimmedi-
atelythosefailingtomeettherelevant
requirements:
•Checkwhetherthereisanydamageordeforma-
tionoftheinverterandinternalequipment.
•Checkifthereisabnormalnoiseduringtheop-
erationofinternalequipment.
•Checkwhetherthetemperatureinsidetheinver-
terisexcessivelyhigh.
•Checkwhetherthehumidityandtheamountof
dustinsidetheinverterarewithinthenormal
range.Cleanitifnecessary.
•Checkwhethertheairinletandoutletofthein-
verterareblocked.
Warningmarks
Checkwhetherthewarninglabelsandmarksare
clearlyvisibleandfreeofstainsanddamage.Re-
placethemifnecessary.
Groundoftheshieldedlayerof
cables
Checkwhetherthecableshieldinglayerisingood
contactwiththeinsulationsleeveandwhetherthe
copperbusbarisfirmlyfixed.
Wiringbetweentheterminalboxand
switch*
Checkwhethertheterminalboxandtheswitch
areconnectedcorrectly.
SPDandfuse
CheckwhethertheSPDandfuseareproperly
fastened.
Corrosion
Checkwhetherthereisoxidationorrustinside
theinverter.
Note:*meansoptional.
SystemManual 10RoutineMaintenance
10.2.2Maintenance(Everytwoyears)
Item Checkmethod
Systemstatusandcleaning
Checkthefollowingitems,andcorrectimmedi-
atelythosefailingtomeettherelevant
requirements:
•Checkwhetherthereisanydamageordeforma-
tionoftheinverterandinternalequipment.
•Checkifthereisabnormalnoiseduringtheop-
erationofinternalequipment.
•Checkwhetherthetemperatureinsidetheinver-
terisexcessivelyhigh.
•Checkwhetherthehumidityandtheamountof
dustinsidetheinverterarewithinthenormal
range.Cleanitifnecessary.
•Checkwhethertheairinletandoutletofthein-
verterareblocked.
Warningmarks
Checkwhetherthewarninglabelsandmarksare
clearlyvisibleandfreeofstainsanddamage.Re-
placethemifnecessary.
Groundoftheshieldedlayerof
cables
Checkwhetherthecableshieldinglayerisingood
contactwiththeinsulationsleeveandwhetherthe
copperbusbarisfirmlyfixed.
Wiringbetweentheterminalboxand
switch*
Checkwhethertheterminalboxandtheswitch
areconnectedcorrectly.
SPDandfuse
CheckwhethertheSPDandfuseareproperly
fastened.
Corrosion
Checkwhetherthereisoxidationorrustinside
theinverter.
Note:*meansoptional.
SystemManual 10RoutineMaintenance
76
10.2.3Maintenance(OnceAYear)
Item Checkmethod
Exterioroftheinverter
Checkthefollowingitems,andcorrectimmediatelythosefail-
ingtomeetrelevantrequirements:
•Checkwhetherthereareflammableobjectsonthetopofthe
inverter.
•Checkwhethertheweldingpointsbetweentheinverterand
foundationsteelplatearefirmandifthereiscorrosion.
•Checkwhethertheenclosureoftheinverterisdamaged,
painted,oroxidized.
•Checkwhetherthemonitoringwindowandcabinetdoorcan
beopenedflexibly.
•Checkwhetherthesealingstripisfixedproperly.
Interioroftheinverter
Checkwhetherthereareforeignobjects,dust,dirt,andcon-
densedwaterinsidetheinverter.
Wiringandcablelayout
Starttoinspectaftercompletelypoweringdowntheinternal
devicesoftheinverter.Foranynon-conformancesfounddur-
ingtheinspection,correctthemimmediately.
•Checkwhetherthecablelayoutisnormalandwhetherthere
isashortcircuit.Foranynon-conformancesfoundduringthe
inspection,correctthemimmediately.
•Checkwhetherallinletandoutletholesoftheinverterare
wellsealed.
•Checkwhetherwaterleaksintotheinverter.
•Checkwhetherthepowercablesareloose,andfastenthem
againbythetorquespecifiedpreviously.
•Checkwhetherthepowercablesandcontrolcablesareda-
maged,especiallythepartincontactwiththemetalenclosure.
•Checkwhethertheinsulationtapesonthepowercableterm-
inalsfelloff.
Groundconnectionand
equipotentialconnection
•Checkwhetherthegroundconnectioniscorrectandthe
groundingresistanceshallbenomorethan4Ω.
•Checkwhethertheinternalequipotentialconnectionis
correct.
Fan
•Checktherunningstatusoffans.
•Checkwhetherthefanbladerotatessmoothly.
•Checkwhetherthereisabnormalnoiseduringtheoperation
ofthefans.
Screw Checkwhetherinternalscrewsfelloff.
10RoutineMaintenance SystemManual
10.2.3Maintenance(OnceAYear)
Item Checkmethod
Exterioroftheinverter
Checkthefollowingitems,andcorrectimmediatelythosefail-
ingtomeetrelevantrequirements:
•Checkwhetherthereareflammableobjectsonthetopofthe
inverter.
•Checkwhethertheweldingpointsbetweentheinverterand
foundationsteelplatearefirmandifthereiscorrosion.
•Checkwhethertheenclosureoftheinverterisdamaged,
painted,oroxidized.
•Checkwhetherthemonitoringwindowandcabinetdoorcan
beopenedflexibly.
•Checkwhetherthesealingstripisfixedproperly.
Interioroftheinverter
Checkwhetherthereareforeignobjects,dust,dirt,andcon-
densedwaterinsidetheinverter.
Wiringandcablelayout
Starttoinspectaftercompletelypoweringdowntheinternal
devicesoftheinverter.Foranynon-conformancesfounddur-
ingtheinspection,correctthemimmediately.
•Checkwhetherthecablelayoutisnormalandwhetherthere
isashortcircuit.Foranynon-conformancesfoundduringthe
inspection,correctthemimmediately.
•Checkwhetherallinletandoutletholesoftheinverterare
wellsealed.
•Checkwhetherwaterleaksintotheinverter.
•Checkwhetherthepowercablesareloose,andfastenthem
againbythetorquespecifiedpreviously.
•Checkwhetherthepowercablesandcontrolcablesareda-
maged,especiallythepartincontactwiththemetalenclosure.
•Checkwhethertheinsulationtapesonthepowercableterm-
inalsfelloff.
Groundconnectionand
equipotentialconnection
•Checkwhetherthegroundconnectioniscorrectandthe
groundingresistanceshallbenomorethan4Ω.
•Checkwhethertheinternalequipotentialconnectionis
correct.
Fan
•Checktherunningstatusoffans.
•Checkwhetherthefanbladerotatessmoothly.
•Checkwhetherthereisabnormalnoiseduringtheoperation
ofthefans.
Screw Checkwhetherinternalscrewsfelloff.
10RoutineMaintenance SystemManual
77
Item Checkmethod
Exterioroftheinverter
Checkthefollowingitems,andcorrectimmediatelythosefail-
ingtomeetrelevantrequirements:
•Checkwhetherthereareflammableobjectsonthetopofthe
inverter.
•Checkwhethertheweldingpointsbetweentheinverterand
foundationsteelplatearefirmandifthereiscorrosion.
•Checkwhethertheenclosureoftheinverterisdamaged,
painted,oroxidized.
•Checkwhetherthemonitoringwindowandcabinetdoorcan
beopenedflexibly.
•Checkwhetherthesealingstripisfixedproperly.
Interiorofthe
transformer
Sampletheinternaloilattheoilleakageporttoanalyzethe
operationstatusofthetransformer.
10.2.4Maintenance(Everyhalfayeartoonceayear)
Item Checkmethod
Safetyfunction
•Checkwhethertheshutdownkeyonthetouchscreenand
thee-stopbuttonworknormally.
•Simulateshutdown.
•Checkthewarningmarksandotherdevicemarks,andre-
placethemtimelyiftheyarefuzzyordamaged.
Softwaremaintenance Checkthesettableparametersonthetouchscreen.
Internalcomponents
inspection
•Checkwhetherthecircuitboardandothercomponentsare
clean.
•Checkthetemperatureoftheheatsinkandtheamountof
dustaccumulated.Cleanheat-dissipationmoduleswithava-
cuumcleanerifnecessary.
•Replacetheairfilterscreenifnecessary.
Note!Besuretochecktheventilationoftheairinlet.Other-
wise,thefaultmaybecausedduetooverheatingifthemodule
cannotbecooledeffectively.
SystemManual 10RoutineMaintenance
Item Checkmethod
Exterioroftheinverter
Checkthefollowingitems,andcorrectimmediatelythosefail-
ingtomeetrelevantrequirements:
•Checkwhetherthereareflammableobjectsonthetopofthe
inverter.
•Checkwhethertheweldingpointsbetweentheinverterand
foundationsteelplatearefirmandifthereiscorrosion.
•Checkwhethertheenclosureoftheinverterisdamaged,
painted,oroxidized.
•Checkwhetherthemonitoringwindowandcabinetdoorcan
beopenedflexibly.
•Checkwhetherthesealingstripisfixedproperly.
Interiorofthe
transformer
Sampletheinternaloilattheoilleakageporttoanalyzethe
operationstatusofthetransformer.
10.2.4Maintenance(Everyhalfayeartoonceayear)
Item Checkmethod
Safetyfunction
•Checkwhethertheshutdownkeyonthetouchscreenand
thee-stopbuttonworknormally.
•Simulateshutdown.
•Checkthewarningmarksandotherdevicemarks,andre-
placethemtimelyiftheyarefuzzyordamaged.
Softwaremaintenance Checkthesettableparametersonthetouchscreen.
Internalcomponents
inspection
•Checkwhetherthecircuitboardandothercomponentsare
clean.
•Checkthetemperatureoftheheatsinkandtheamountof
dustaccumulated.Cleanheat-dissipationmoduleswithava-
cuumcleanerifnecessary.
•Replacetheairfilterscreenifnecessary.
Note!Besuretochecktheventilationoftheairinlet.Other-
wise,thefaultmaybecausedduetooverheatingifthemodule
cannotbecooledeffectively.
SystemManual 10RoutineMaintenance
78
Item Checkmethod
Airinletandoutlet
Checkthetemperatureoftheheatsinkandtheamountofdust
accumulated.Cleanheat-dissipationmoduleswithavacuum
cleanerifnecessary.
Devicemaintenance
•Carryoutregularinspectionforcorrosionofallmetal
components.
•Checkthecontactortoensureanormalmechanical
operation.
•Checktheoperationparameters(especiallyvoltageand
insulation).
Therecommendedroutinemaintenanceperiodsinthetableareonlyforreference.
Theactualmaintenanceperiodshallbedeterminedreasonablyinconsideration
ofthespecificinstallationenvironmentoftheproduct.
Powerplantscale,location,siteenvironment,andotherfactorsalsoaffectthe
maintenanceperiodoftheproduct.Itisnecessarytoshortenthemaintenance
periodandincreasethemaintenancefrequencyintheeventofaheavysandstorm
ordustintheoperatingenvironment.
10.3CommonMaintenanceItems
Itisrecommendedtocleantheinverteronceeverysixmonths.Iftheinverterworksinharsh
environments,suchasdesertareas,themaintenancecycleshouldbeshortened.
10.3.1CleaningAirInletofInverter
Overview
Thefollowingfigureshowstheheatdissipationmodeoftheinverter.Theairinletislocated
atthehigherpartsoftheDCcabinetwhiletheairoutletislocatedatthelowerpartsofthe
ACcabinet.
10RoutineMaintenance SystemManual
Item Checkmethod
Airinletandoutlet
Checkthetemperatureoftheheatsinkandtheamountofdust
accumulated.Cleanheat-dissipationmoduleswithavacuum
cleanerifnecessary.
Devicemaintenance
•Carryoutregularinspectionforcorrosionofallmetal
components.
•Checkthecontactortoensureanormalmechanical
operation.
•Checktheoperationparameters(especiallyvoltageand
insulation).
Therecommendedroutinemaintenanceperiodsinthetableareonlyforreference.
Theactualmaintenanceperiodshallbedeterminedreasonablyinconsideration
ofthespecificinstallationenvironmentoftheproduct.
Powerplantscale,location,siteenvironment,andotherfactorsalsoaffectthe
maintenanceperiodoftheproduct.Itisnecessarytoshortenthemaintenance
periodandincreasethemaintenancefrequencyintheeventofaheavysandstorm
ordustintheoperatingenvironment.
10.3CommonMaintenanceItems
Itisrecommendedtocleantheinverteronceeverysixmonths.Iftheinverterworksinharsh
environments,suchasdesertareas,themaintenancecycleshouldbeshortened.
10.3.1CleaningAirInletofInverter
Overview
Thefollowingfigureshowstheheatdissipationmodeoftheinverter.Theairinletislocated
atthehigherpartsoftheDCcabinetwhiletheairoutletislocatedatthelowerpartsofthe
ACcabinet.
10RoutineMaintenance SystemManual
79
Procedure
Step1UseascrewdrivertoremovetheM5fixingscrewsforthefirstmaintenance.
Step2Pullthespringplungeratbothendsofthefilterattheairinletoutwardandtiltthefilterdown-
wardtoremoveit.
Step3Cleanandinstallthefilter.
--End
10.3.2CleaningAirOutletofInverter
Overview
Therearemultipleairoutletsinthisproduct,whicharelocatedbetweentheinverterandthe
transformerandatthebottomoftheACsideofeachinverter,asshowninthefollowing
figures.
Step1Cleantheairoutletbetweentheinverterandtransformer.
SystemManual 10RoutineMaintenance
Procedure
Step1UseascrewdrivertoremovetheM5fixingscrewsforthefirstmaintenance.
Step2Pullthespringplungeratbothendsofthefilterattheairinletoutwardandtiltthefilterdown-
wardtoremoveit.
Step3Cleanandinstallthefilter.
--End
10.3.2CleaningAirOutletofInverter
Overview
Therearemultipleairoutletsinthisproduct,whicharelocatedbetweentheinverterandthe
transformerandatthebottomoftheACsideofeachinverter,asshowninthefollowing
figures.
Step1Cleantheairoutletbetweentheinverterandtransformer.
SystemManual 10RoutineMaintenance
80
Step2CleantheairoutletsatthebottomoftheACsideoftheinverters.
--End
10.3.3CleaningAirInletofPowerDistributionCabinet
Step1Removethescrewsfromtheupperairinletofthepowerdistributioncabinetusinga
screwdriver.
Step2Movethefiltercottonattheairinletdownward,takeoutthefiltercottonandcleanit.
Step3Reinstallthefiltercottoninreversesteps.
*Thefigureisforreferenceonly.Andtheactualproductreceivedshallprevail.
--End
10.3.4CleaningAirOutletofPowerDistributionCabinet
Step1Pulldownwardthespringplungerontheairoutletatthebottomofthepowerdistribution
cabinet.
Step2Pulloutthefilterattheairoutletandcleanit.
Step3Reinstallthefilterinreversesteps.
*Thefigureisforreferenceonly.Andtheactualproductreceivedshallprevail.
--End
10RoutineMaintenance SystemManual
Step2CleantheairoutletsatthebottomoftheACsideoftheinverters.
--End
10.3.3CleaningAirInletofPowerDistributionCabinet
Step1Removethescrewsfromtheupperairinletofthepowerdistributioncabinetusinga
screwdriver.
Step2Movethefiltercottonattheairinletdownward,takeoutthefiltercottonandcleanit.
Step3Reinstallthefiltercottoninreversesteps.
*Thefigureisforreferenceonly.Andtheactualproductreceivedshallprevail.
--End
10.3.4CleaningAirOutletofPowerDistributionCabinet
Step1Pulldownwardthespringplungerontheairoutletatthebottomofthepowerdistribution
cabinet.
Step2Pulloutthefilterattheairoutletandcleanit.
Step3Reinstallthefilterinreversesteps.
*Thefigureisforreferenceonly.Andtheactualproductreceivedshallprevail.
--End
10RoutineMaintenance SystemManual
81
10.3.5AppearanceRepair
Checktheappearanceoftheproduct:
Case1:Erasabletraces
Case2:Indelibletraces
Case3:Brokenprimer
Checkwhethertheprotectivepaintsprayedonthecasingoftheproductfelloffor
peeledoff.Ifso,repairittimely.
Sprayaspecialprotectivepainttotheexterioroftheproductevery5years.
10.3.5.1ErasableTraces
Tools
No. Name Source
1 Cleaningcloth
Beyondthescopeofsupply2 Water
3 Alcoholorothernon-corrosivedetergents
Step1Wetthecleaningcloth(orotherscrubbingtools)withwater,andscrubthedirtypartsonthe
surface.
Step2Ifthedirtcannotbecleanedwithwater,scrubwith97%alcoholtillthesurfaceisacceptable.
(Ortrytousenon-corrosivedetergentsthataregenerallyusedlocally)
--End
10.3.5.2IndelibleTraces
Tools
No. Name Source
1 Abrasivepaper
Beyondthescopeofsupply
2 Cleaningcloth
3 Water
4 Alcohol
5 Brush
6 RAL7035oilpaint
Step1Polishthepaintsurfacewithblisteringorscratcheswithabrasivepaperforasmoothsurface.
Step2Wetthecleaningclothwithwateror97%alcohol,andscrubthedamagedpartstoremove
surfacestains.
SystemManual 10RoutineMaintenance
10.3.5AppearanceRepair
Checktheappearanceoftheproduct:
Case1:Erasabletraces
Case2:Indelibletraces
Case3:Brokenprimer
Checkwhethertheprotectivepaintsprayedonthecasingoftheproductfelloffor
peeledoff.Ifso,repairittimely.
Sprayaspecialprotectivepainttotheexterioroftheproductevery5years.
10.3.5.1ErasableTraces
Tools
No. Name Source
1 Cleaningcloth
Beyondthescopeofsupply2 Water
3 Alcoholorothernon-corrosivedetergents
Step1Wetthecleaningcloth(orotherscrubbingtools)withwater,andscrubthedirtypartsonthe
surface.
Step2Ifthedirtcannotbecleanedwithwater,scrubwith97%alcoholtillthesurfaceisacceptable.
(Ortrytousenon-corrosivedetergentsthataregenerallyusedlocally)
--End
10.3.5.2IndelibleTraces
Tools
No. Name Source
1 Abrasivepaper
Beyondthescopeofsupply
2 Cleaningcloth
3 Water
4 Alcohol
5 Brush
6 RAL7035oilpaint
Step1Polishthepaintsurfacewithblisteringorscratcheswithabrasivepaperforasmoothsurface.
Step2Wetthecleaningclothwithwateror97%alcohol,andscrubthedamagedpartstoremove
surfacestains.
SystemManual 10RoutineMaintenance
82
Step3Performpaintrepairforthescratchedpartswithasoftbrushafterthesurfaceisdried;brush
thepaintasuniformaspossible.
--End
10.3.5.3BrokenPrimer
Tools
No. Name Source
1 Abrasivepaper
Beyondthescopeofsupply
2 Cleaningcloth
3 Water
4 Alcohol
5 Zincprimer
6 Brush
7 RAL7035oilpaint
Step1Polishthedamagedpartswithabrasivepapertoremoverustandotherburrsforasmooth
surface.
Step2Wetthecleaningclothwithwateror97%alcohol,andscrubthedamagedpartstoremove
surfacestainsanddust.
Step3Spraythepartswithbasematerialexposedwithzincprimerforprotectionafterdryingthe
surface.Ensuretospraytocoverthebarebasematerialcompletely.
10RoutineMaintenance SystemManual
Step3Performpaintrepairforthescratchedpartswithasoftbrushafterthesurfaceisdried;brush
thepaintasuniformaspossible.
--End
10.3.5.3BrokenPrimer
Tools
No. Name Source
1 Abrasivepaper
Beyondthescopeofsupply
2 Cleaningcloth
3 Water
4 Alcohol
5 Zincprimer
6 Brush
7 RAL7035oilpaint
Step1Polishthedamagedpartswithabrasivepapertoremoverustandotherburrsforasmooth
surface.
Step2Wetthecleaningclothwithwateror97%alcohol,andscrubthedamagedpartstoremove
surfacestainsanddust.
Step3Spraythepartswithbasematerialexposedwithzincprimerforprotectionafterdryingthe
surface.Ensuretospraytocoverthebarebasematerialcompletely.
10RoutineMaintenance SystemManual
83
Step4Performpaintrepairforthedamagedpartswithasoftbrushaftertheprimerisdried,and
brushthepaintuniformly.
--End
10.3.6CheckingDoorLocksandHinges
Checkifthedoorlocksandhingesoftheinvertercanbeusednormallyaftercleaning.Lubri-
catethedoorlockholesandhingesproperlyifnecessary.
10.3.7CheckingSealingStrips
Ifthesealingstripisingoodcondition,itcaneffectivelypreventwaterseepageinsidethe
product.Therefore,carefullycheckthesealingstripandreplaceitimmediatelyifthereisany
damage.
10.4ReplacingFuse
Beforereplacingthefuse,ensurethattheproductisde-energized.
10.4.1ReplacingDCSideFuse
Step1Powerofftheinverteraccordingtothenormalshutdownsteps.
Step2Waitfor20minutesfortheinternalcapacitorstobecompletelydischarged.
Step3Useamultimeterwitharangeof1500VdctomeasuretheDCsidevoltageoftheinverter.
Checkandensurethatthepositivevoltage,negativevoltage,positivetogroundvoltage,
andnegativetogroundvoltageareallzero.
Step4UnlocktheDCcabinetdoorandremovetheprotectivecoverontheDCfuse.
Step5UseamultimetertomeasureeachDCinputvoltageandensurethattheterminalsare
unchargedbeforeperformingthenextoperation.
Step6Identifythefaultyfuse,useasocketwrenchtounscrewthefasteningboltofthefusetobe
replaced,andremovethefaultyfuse.
SystemManual 10RoutineMaintenance
Step4Performpaintrepairforthedamagedpartswithasoftbrushaftertheprimerisdried,and
brushthepaintuniformly.
--End
10.3.6CheckingDoorLocksandHinges
Checkifthedoorlocksandhingesoftheinvertercanbeusednormallyaftercleaning.Lubri-
catethedoorlockholesandhingesproperlyifnecessary.
10.3.7CheckingSealingStrips
Ifthesealingstripisingoodcondition,itcaneffectivelypreventwaterseepageinsidethe
product.Therefore,carefullycheckthesealingstripandreplaceitimmediatelyifthereisany
damage.
10.4ReplacingFuse
Beforereplacingthefuse,ensurethattheproductisde-energized.
10.4.1ReplacingDCSideFuse
Step1Powerofftheinverteraccordingtothenormalshutdownsteps.
Step2Waitfor20minutesfortheinternalcapacitorstobecompletelydischarged.
Step3Useamultimeterwitharangeof1500VdctomeasuretheDCsidevoltageoftheinverter.
Checkandensurethatthepositivevoltage,negativevoltage,positivetogroundvoltage,
andnegativetogroundvoltageareallzero.
Step4UnlocktheDCcabinetdoorandremovetheprotectivecoverontheDCfuse.
Step5UseamultimetertomeasureeachDCinputvoltageandensurethattheterminalsare
unchargedbeforeperformingthenextoperation.
Step6Identifythefaultyfuse,useasocketwrenchtounscrewthefasteningboltofthefusetobe
replaced,andremovethefaultyfuse.
SystemManual 10RoutineMaintenance
84
Step7SecurethenewfusewithM10×30*boltswithatighteningtorqueof34-40N.m.
--End
*WhentheDCinputoftheinverterisequippedwithMPLC,theboltsspecificationsusedare
M8×30andM10×30.
10.4.2ReplacingFuseInsidePowerDistributionCabinet
Asforthereplacementofthefuseinsidethedistributioncabinet,pleaserefertothe"3.3.4
MainPartsofPowerDistributionCabinet" and"7.2.3InstallingFuseinACSPD" .
10.5ReplacingFans
Overview
Thissectiondescribeshowtoreplacefanswithanexampleofreplacingthefanatthetop
rightendoftheACsideoftheinverterasanexample.
Procedure
Step1RemovetheboltsfromthetopdoorontheACcabinetandopenthecabinetdoor.
Step2RemovetheM5boltsbetweenthefanfixingplateandthebottomplatformandtakedown
thefan.
Step3RemovethefourM5boltsconnectingthefanandthefixingplate,andremovethefan.
Step4Installanewfaninreversesteps.
--End
10RoutineMaintenance SystemManual
Step7SecurethenewfusewithM10×30*boltswithatighteningtorqueof34-40N.m.
--End
*WhentheDCinputoftheinverterisequippedwithMPLC,theboltsspecificationsusedare
M8×30andM10×30.
10.4.2ReplacingFuseInsidePowerDistributionCabinet
Asforthereplacementofthefuseinsidethedistributioncabinet,pleaserefertothe"3.3.4
MainPartsofPowerDistributionCabinet" and"7.2.3InstallingFuseinACSPD" .
10.5ReplacingFans
Overview
Thissectiondescribeshowtoreplacefanswithanexampleofreplacingthefanatthetop
rightendoftheACsideoftheinverterasanexample.
Procedure
Step1RemovetheboltsfromthetopdoorontheACcabinetandopenthecabinetdoor.
Step2RemovetheM5boltsbetweenthefanfixingplateandthebottomplatformandtakedown
thefan.
Step3RemovethefourM5boltsconnectingthefanandthefixingplate,andremovethefan.
Step4Installanewfaninreversesteps.
--End
10RoutineMaintenance SystemManual
85
11Appendix
11.1TechnicalParameters
SG3300UD-MV/SG4400UD-MV -20
Model SG3300UD-MV SG4400UD-MV
Input(DC)
Max.PVinputvoltage 1500V
Min.PVinputvoltage/Start-
upinputvoltage
895V/905V
MPPvoltagerange 895–1500V
No.ofindependentMPP
inputs
3 4
No.ofDCinputs
15(optional:18/21inputs
negativegrounding)
20(optional:24/28inputs
negativegrounding)
Max.PVinputcurrent 3x1435A 4x1435A
Max.DCshort-circuitcurrent 3x3528A 4x3528A
PVArrayConfiguration Negativegroundingorfloating
Output(AC)
ACoutputpower
3300kVA@45℃,3795
[email protected]℃
4400kVA@45℃,5060
[email protected]℃
Max.inverteroutputcurrent 3x1160A 4x1160A
Max.ACoutputcurrent 110A 146A
ACvoltagerange 10kV–35kV
Nominalgridfrequency/Grid
frequencyrange
50Hz/45–55Hz,60Hz/54–66Hz
Harmonic(THD) <3%(atnominalpower)
PowerFactoratNominal
Power/AjustablePower
Factor
>0.99/0.8leading-0.8lagging
Feed-inphases/AC
connection
3/3–PE
Efficiency
Invertermax.efficiency/Inver-
terEuropeanefficiency
99.0%/98.7%
Transformer
Transformerratedpower 3300kVA 4400kVA
11Appendix
11.1TechnicalParameters
SG3300UD-MV/SG4400UD-MV -20
Model SG3300UD-MV SG4400UD-MV
Input(DC)
Max.PVinputvoltage 1500V
Min.PVinputvoltage/Start-
upinputvoltage
895V/905V
MPPvoltagerange 895–1500V
No.ofindependentMPP
inputs
3 4
No.ofDCinputs
15(optional:18/21inputs
negativegrounding)
20(optional:24/28inputs
negativegrounding)
Max.PVinputcurrent 3x1435A 4x1435A
Max.DCshort-circuitcurrent 3x3528A 4x3528A
PVArrayConfiguration Negativegroundingorfloating
Output(AC)
ACoutputpower
3300kVA@45℃,3795
[email protected]℃
4400kVA@45℃,5060
[email protected]℃
Max.inverteroutputcurrent 3x1160A 4x1160A
Max.ACoutputcurrent 110A 146A
ACvoltagerange 10kV–35kV
Nominalgridfrequency/Grid
frequencyrange
50Hz/45–55Hz,60Hz/54–66Hz
Harmonic(THD) <3%(atnominalpower)
PowerFactoratNominal
Power/AjustablePower
Factor
>0.99/0.8leading-0.8lagging
Feed-inphases/AC
connection
3/3–PE
Efficiency
Invertermax.efficiency/Inver-
terEuropeanefficiency
99.0%/98.7%
Transformer
Transformerratedpower 3300kVA 4400kVA
86
Model SG3300UD-MV SG4400UD-MV
Transformermax.power 3795kVA 5060kVA
LV/MVvoltage 0.63kV/(10–35)kV 0.63kV/(10–35)kV
Impedance 7%(0~±10%)@3300kVA 8%(0~±10%)@4400kVA
Transformervector Dy11
Transformercoolingtype ONAN/Optional：ONAF
Oiltype Mineraloil(PCBfree)ordegradableoilonrequest
Protection&Function
DCInputProtection Loadbreakswitch+fuse
InverterOutputProtection Circuitbreaker
ACMVOutputProtection Circuitbreaker
OvervoltageProtection DCTypeII/ACTypeII
GridMonitoring/GroundFault
Monitoring
Yes/Yes
InsulationMonitoring Yes
OverheatProtection Yes
Qatnightfunction Optional
GeneralData
Dimensions(WxHxD)* 6058*2896*2438mm
Weight* 16T 18T
DegreeofProtection Inverter:IP65/Others:IP54
AuxiliaryPowerSupply 5kVA(optional:max.40kVA)
OperatingAmbientTempera-
tureRange
-35to60℃(>45℃
derating)
-35to60℃(>45℃
derating)
AllowableRelativeHumidity
Range
0-100%
CoolingMethod Temperaturecontrolledforcedaircooling
Max.OperatingAltitude 1000m(standard)/>1000m(optional)
Display LEDIndicators,WLAN+WebHMI
Communication
Standard:RS485,Ethernet;Optional:opticalfiber;
MPLC
GridSupport
Qatnight(Optional),L/HVRT,active&reactivepower
controlandpowerrampratecontrol
11.2TighteningTorques
Tightenthecablewithpropertorqueshownbelowtopreventthepoorcontact,highcontact
resistance,orfirecausedbytheloosenessofcablelugs:
11Appendix SystemManual
Model SG3300UD-MV SG4400UD-MV
Transformermax.power 3795kVA 5060kVA
LV/MVvoltage 0.63kV/(10–35)kV 0.63kV/(10–35)kV
Impedance 7%(0~±10%)@3300kVA 8%(0~±10%)@4400kVA
Transformervector Dy11
Transformercoolingtype ONAN/Optional：ONAF
Oiltype Mineraloil(PCBfree)ordegradableoilonrequest
Protection&Function
DCInputProtection Loadbreakswitch+fuse
InverterOutputProtection Circuitbreaker
ACMVOutputProtection Circuitbreaker
OvervoltageProtection DCTypeII/ACTypeII
GridMonitoring/GroundFault
Monitoring
Yes/Yes
InsulationMonitoring Yes
OverheatProtection Yes
Qatnightfunction Optional
GeneralData
Dimensions(WxHxD)* 6058*2896*2438mm
Weight* 16T 18T
DegreeofProtection Inverter:IP65/Others:IP54
AuxiliaryPowerSupply 5kVA(optional:max.40kVA)
OperatingAmbientTempera-
tureRange
-35to60℃(>45℃
derating)
-35to60℃(>45℃
derating)
AllowableRelativeHumidity
Range
0-100%
CoolingMethod Temperaturecontrolledforcedaircooling
Max.OperatingAltitude 1000m(standard)/>1000m(optional)
Display LEDIndicators,WLAN+WebHMI
Communication
Standard:RS485,Ethernet;Optional:opticalfiber;
MPLC
GridSupport
Qatnight(Optional),L/HVRT,active&reactivepower
controlandpowerrampratecontrol
11.2TighteningTorques
Tightenthecablewithpropertorqueshownbelowtopreventthepoorcontact,highcontact
resistance,orfirecausedbytheloosenessofcablelugs:
11Appendix SystemManual
87
Bolt Torque(N·m) Bolt Torque(N·m)
M3 0.7~1 M8 18~23
M4 1.8~2.4 M10 34~40
M5 4~4.8 M12 60~70
M6 7~8 M16 119~140
*Thetorquevalueslistedinthetableareforthecombinationofboltandnut,anddonotap-
plytorivetednutsorrivetedscrews,etc.Pleaserefertotheactualsituation!
**Securethecableinproperplacetoreducepressureofcablelug.
11.3QualityAssurance
Whenproductfaultsoccurduringthewarrantyperiod,SUNGROW willprovidefreeservice
orreplacetheproductwithanewone.
Evidence
Duringthewarrantyperiod,thecustomershallprovidetheproductpurchaseinvoiceand
date.Inaddition,thetrademarkontheproductshallbeundamagedandlegible.Otherwise,
SUNGROW hastherighttorefusetohonorthequalityguarantee.
Conditions
•Afterreplacement,unqualifiedproductsshallbeprocessedbySUNGROW.
•ThecustomershallgiveSUNGROW areasonableperiodtorepairthefaultydevice.
ExclusionofLiability
Inthefollowingcircumstances,SUNGROW hastherighttorefusetohonorthequality
guarantee:
•Thefreewarrantyperiodforthewholemachine/componentshasexpired.
•Thedeviceisdamagedduringtransport.
•Thedeviceisincorrectlyinstalled,refitted,orused.
•Thedeviceoperatesinharshconditionsbeyondthosedescribedinthismanual.
•Thefaultordamageiscausedbyinstallation,repairs,modification,ordisassemblyper-
formedbyaserviceproviderorpersonnelnotfromSUNGROW.
•Thefaultordamageiscausedbytheuseofnon-standardornon-SUNGROW compo-
nentsorsoftware.
•Theinstallationanduserangearebeyondstipulationsofrelevantinternational
standards.
•Thedamageiscausedbyunexpectednaturalfactors.
Forfaultyproductsinanyofabovecases,ifthecustomerrequestsmaintenance,paidmain-
tenanceservicemaybeprovidedbasedonthejudgmentofSUNGROW.
SystemManual 11Appendix
Bolt Torque(N·m) Bolt Torque(N·m)
M3 0.7~1 M8 18~23
M4 1.8~2.4 M10 34~40
M5 4~4.8 M12 60~70
M6 7~8 M16 119~140
*Thetorquevalueslistedinthetableareforthecombinationofboltandnut,anddonotap-
plytorivetednutsorrivetedscrews,etc.Pleaserefertotheactualsituation!
**Securethecableinproperplacetoreducepressureofcablelug.
11.3QualityAssurance
Whenproductfaultsoccurduringthewarrantyperiod,SUNGROW willprovidefreeservice
orreplacetheproductwithanewone.
Evidence
Duringthewarrantyperiod,thecustomershallprovidetheproductpurchaseinvoiceand
date.Inaddition,thetrademarkontheproductshallbeundamagedandlegible.Otherwise,
SUNGROW hastherighttorefusetohonorthequalityguarantee.
Conditions
•Afterreplacement,unqualifiedproductsshallbeprocessedbySUNGROW.
•ThecustomershallgiveSUNGROW areasonableperiodtorepairthefaultydevice.
ExclusionofLiability
Inthefollowingcircumstances,SUNGROW hastherighttorefusetohonorthequality
guarantee:
•Thefreewarrantyperiodforthewholemachine/componentshasexpired.
•Thedeviceisdamagedduringtransport.
•Thedeviceisincorrectlyinstalled,refitted,orused.
•Thedeviceoperatesinharshconditionsbeyondthosedescribedinthismanual.
•Thefaultordamageiscausedbyinstallation,repairs,modification,ordisassemblyper-
formedbyaserviceproviderorpersonnelnotfromSUNGROW.
•Thefaultordamageiscausedbytheuseofnon-standardornon-SUNGROW compo-
nentsorsoftware.
•Theinstallationanduserangearebeyondstipulationsofrelevantinternational
standards.
•Thedamageiscausedbyunexpectednaturalfactors.
Forfaultyproductsinanyofabovecases,ifthecustomerrequestsmaintenance,paidmain-
tenanceservicemaybeprovidedbasedonthejudgmentofSUNGROW.
SystemManual 11Appendix
88
11.4ContactInformation
Incaseofquestionsaboutthisproduct,pleasecontactus.
Weneedthefollowinginformationtoprovideyouthebestassistance:
•Modelofthedevice
•Serialnumberofthedevice
•Faultcode/name
•Briefdescriptionoftheproblem
Fordetailedcontactinformation,pleasevisit:https://en.sungrowpower.com/contactUS
11Appendix SystemManual
11.4ContactInformation
Incaseofquestionsaboutthisproduct,pleasecontactus.
Weneedthefollowinginformationtoprovideyouthebestassistance:
•Modelofthedevice
•Serialnumberofthedevice
•Faultcode/name
•Briefdescriptionoftheproblem
Fordetailedcontactinformation,pleasevisit:https://en.sungrowpower.com/contactUS
11Appendix SystemManual
M-D-000582
www.sungrowpower.com
Sungrow Power Supply Co., Ltd.
www.sungrowpower.com
Sungrow Power Supply Co., Ltd.
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