EXV Module - Troubleshooting For Engineers

EXV

1. Electronic
Expansion Valves
Troubleshooting

2. Contents
•Error/Alarm Handling
•Troubleshooting Guide Chart
•Exercises
T r o u b l e s h o o t i n g

3. Error/Alarm Handling

4. Error/Alarm Handling
E C 3 - X 3 2
Alarm Code Description
Related
Parameter
Alarm RelayValve What To Do?
Requires Manual Reset
After Resolving Alarm
E0
Pressure Transmitter
Error
- SignalingFully Close
Check Wiring Connection & Measure
The Signal 4 To 20mA.
No
E1
Temperature Sensor
Error
- SignalingFully Close
Check Wiring Connection & Measure
The Resistance Of Sensor.
No
AΠ
EX4…EX8 Electrical
Connection Error
- Signaling -
Check Wiring Connection & Measure
The Resistance Of Winding.
No
Ab
Battery Error
b1: 1 - Regulating
Battery Potentially Does Not Have
Enough Charge To Close Valve In Case
Of Main Power Supply Interruption.
May Occur Temporarily With New
Controllers Or After Long Storage But
Should Disappear When Battery Is
Charged Sufficiently. If Ab Remains
Active Even When Battery Is Charged,
Battery May Be Defective And Should
Be Replaced.
(Replacement Kit: 807 790).
-
Ab b1: 2 SignalingFully Close -
Ab
blinking
b1: 3 SignalingFully Close Yes
AE blinking
Pump Down Action
Cannot Be
Accomplished
P6: 1 Signaling _
Allocate The Source, Which Does Not
Let Suction Pressure Drops Below
Desired Set-point.
Yes
AF
AF blinking
Freeze Protection
P4: 1
P4: 2
Signaling
Signaling
Fully Close
Fully Close
Check The System For Cause Of Low
Pressure Such As Insufficient Load On
Evaporator
No
Yes

5. Alarm Code Description
Related
Parameter
Alarm RelayValve What To Do?
Requires Manual Reset
After Resolving Alarm
AL
AL blinking
Low Superheat (<1
0
F)
uL: 1
uL: 2
Signaling
Signaling
Fully Close
Fully Close
Check Wiring Connection & Operation
Of Valve
No
Yes
AH High Superheat uH: 1 SignalingFully CloseCheck The System No
AP
AP blinking
Low Pressure
P9: 1
P9: 2
Signaling
Signaling
Fully Close
Fully Close
Check The System For Cause Of Low
Pressure Such As Refrigerant Loss
No
Yes
Er
Data Error Display - Out
of range
- - -
Data Send To The Display Is Out Of
Range. Check Temperature And
Pressure Sensor.
No
Error/Alarm Handling
E C 3 - X 3 2

6. Alarm Code Description
Related
Parameter
Alarm
Relay
Valve What To Do?
Requires Manual Reset
After Resolving Alarm
E0
Pressure Transmitter
Error
- Signaling
Fully
Close
Check Wiring Connection & Measure
The Signal 4 To 20mA.
No
E1
Temperature Sensor
Error
- Signaling
Fully
Close
Check Wiring Connection & Measure
The Resistance Of Sensor.
No
AΠ
EX4…EX8 Electrical
Connection Error
- Signaling-
Check Wiring Connection & Measure
The Resistance Of Winding.
No
AL
Low Superheat
(<0,5K)
uL: 1Signaling
Fully
CloseCheck Wiring Connection &
Operation Of Valve.
No
AL
blinking
uL: 2Signaling
Fully
Close
Yes
Ab
Battery Error
b1: 1 - Regulating
Battery Potentially Does Not Have
Enough Charge To Close Valve In
Case Of Main Power Supply
Interruption. May Occur Temporarily
With New Controllers Or After Long
Storage But Should Disappear When
Battery Is Charged Sufficiently. If Ab
Remains Active Even When Battery
Is Charged, Battery May Be Defective
And Should Be Replaced.
(Replacement Kit: 807 790).
-
Ab b1: 2Signaling
Fully
Close
-
Ab
blinking
b1: 3Signaling
Fully
Close
Yes
Er
Data Error Display -
Out of range
- - -
Data Send To The Display Is Out Of
Range. Check Temperature And
Pressure Sensor.
No
Error/Alarm Handling
E C 3 - X 3 3

7. Troubleshooting

Guide Chart

8. E X D - U 0 0
( D r i v e r W i t h A u x i l l a r y C o n t r o l l e r )
Symptom Cause Action Remark
Valve Is Not
Moving
Digital Input Has
Priority To
Analogue Signal Input
Digital Input Must Be
Activated And
Deactivated Along With
Compressor Start And
Stop
Wrong Setting Of
Dipswitches
Adjust The Dip Switches
Correctly. The Power
Supply Must Be Off
During This Action
Refer To Dip Switch Number
Setting
Supply Voltage Too Low Supply Voltage: 24VAC ± 10%
If External ECP-024 Is Used.
Supply Voltage: 24vac Or
VDC ± 10% If External
ECP-024 Is Not Connected
Wrong Wiring Between
Valve
And Driver
Correct The Wiring
Troubleshooting Guide Chart

9. D i p S w i t c h S e t t i n g
Troubleshooting Guide Chart
Function
Dip Switch Number
12345678
EX4/EX5/EX6 Operation 011010--
EX7 Operation 100101--
EX8 Operation 110111--
4-20mA Analogue Input Signal-------0
0-10V Analogue Input Signal-------1
With Start Mode ------1-
Without Start Mode ------0-

10. E X D - U 0 0
( D r i v e r W i t h A u x i l l a r y C o n t r o l l e r )
Symptom Cause Action Remark
Valve Operating In
Reverse Direction
Wrong Wiring Between
Driver And Valve
Correct The Wiring
The Valve Is Not At
The Position
Corresponding To
Input Signal
Digital Input Of Driver Has
Been Jumpered So There
Is No Synchronization At
All
Driver Does Not
Show Any Life
Wrong Supply Voltage
Applied
Change EXDU00 Temporary High Voltage Such
As 110V/230V May Damage
The Driver
Troubleshooting Guide Chart

11. E C 3 - X 3 2 & X 3 3
Symptom Cause Action
Superheat Is Several
Degrees Higher Or Lower
Than Set-point
Incorrect Signal From
Pressure Or Temperature
Sensors
1. Check The Sensors
2. Make Sure ECN-N60 Temperature Sensor
Is Used
3. For Optimum Accuracy, Please Use:
PT4-07S For R22/R134a/R507/R404A
/R407C/R124
PT4-18S For R410A Or For Economizer
Applications
PT4-30S For R744
4. Make Sure The Sensor Cables Are Not
Installed Along With Other High Voltage
Cables
Operating Superheat Is Too
Low I.E. Compressor Wet
Running
1. Incorrect Wiring Of ECV’s
2. Defective Sensors
1. Check The Wiring
2. Check The Sensor
Valve Is Not Fully Closed1. The Digital Input Is ON
(24V)
2. Wrong Setting Of
Parameter Ut.
1. Valve Is Shut Off Only When The Digital
Input Is Turned Off (0V)
2. Check The Setting Of Parameter Ut
Troubleshooting Guide Chart

12. E C 3 - X 3 2 & X 3 3
Symptom Cause Action
Instable Superheat
(Hunting)
Uneven Refrigerant
Distribution Or
Evaporator With Very Long
Length/
Time Constant
Evaporator Is Designed To
Operate At Higher
Superheat
Change Superheat Control Mode From
Standard To Slow
Increase The Superheat Set-point
Valve Opens When EC3
Commands To Close And
Vice Versa
Wrong Wiring Between
EC3-X32/X33 And Valve
Correct The Wiring
EX8 Is Not Able To Open At
High Differential Pressure
Wrong Setting Of
Parameter Ut
Check The Parameter Ut. (Larger Valve
Requires Higher Torque And Higher Current)
Troubleshooting Guide Chart

13. E C 3 - X 3 2 & X 3 3
Symptom Cause Action
Superheat Set-point Is
Shifting After Several
Months Of Uninterrupted
Operation Or Permanent
Jumper Of 24V Digital Input
Stepper Motor Driven
Valves Require
Synchronization
Do Not Apply Permanent 24V Digital Input.
Interrupt Digital Input Once Every Week For
5 Seconds If Compressor Never Stops.
EC3 Does Not Show Any
Life
Wrong Supply Voltage
Applied
Change EC3
EC3 Internal Stepper
Motor Chip Is Burn Out
Short Circuit Of Output
Terminals
(For Connection To ECV)
Or Short
Circuit Between Output
Terminal With Ground
Change EC3
Troubleshooting Guide Chart

14. E C 3 - X 3 2
( C o n t r o l l e r W i t h C o m p u t e r )
Symptom Cause Action
Not Able To Get Data On PC
Monitor
No Connection Or
Improper Connection
Between PC And EC3-X32
Wrong Electrical Plug
EC3-X32 And PC Are Not In
A Logical Network
Check The Network Wiring
Use RJ45 Only (RJ11 Is Not Suitable)
Check TCP/IP Configuration Of Windows
(2000, XP Or
Vista)
Troubleshooting Guide Chart

15. E C 3 - X 3 3
( C o n t r o l l e r W i t h K e y p a d )
Symptom Cause Action
ECD-002 Display Unit Does
Not Show Any Information
No Connection Or
Improper Connection
Between ECD-002 And
EC3-X33
Wrong Electrical Plug
EC3-X33 Is Defective
Use Only CAT 5 LAN Cable
Use Rj45 Only (Rj11 Is Not Suitable)
Change The EC3-X33
Troubleshooting Guide Chart

16. Exercises

17. Question 1:
For EC3-X32, “E0” Error Code Stands For ________?
a.) Pressure Transmitter Errorb.) EX4 To EX8 Electrical Connection Error
c.) Temperature Sensor Error d.) Battery Error
Question 2:
For EC3-X32, “E1” Error Code Stands For ________?
a.) Pressure Transmitter Errorb.) EX4 To EX8 Electrical Connection Error
c.) Temperature Sensor Error d.) Battery Error
EXERCISES
C h o o s e T h e L e t t e r O f T h e B e s t A n s w e r

18. Question 4:
For EC3-X32, “Ab” Error Code Stands For ________?
a.) Pressure Transmitter Errorb.) EX4 To EX8 Electrical Connection Error
c.) Temperature Sensor Error d.) Battery Error
Question 3:
For EC3-X32, “AΠ “ Error Code Stands For ________?
a.)Measure The Signal 4 To 20mA b.) EX4 To EX8 Electrical Connection Error
c.) Temperature Sensor Error d.) Battery Error
EXERCISES
C h o o s e T h e L e t t e r O f T h e B e s t A n s w e r

19. Question 5:
What Do You Need To Do If Error Code “E0” Shows?
a.) Check Wiring Connection & Measure The Signal 4 To 20mA.
b.) Check Wiring Connection & Measure The Resistance Of Sensor.
c.) Check Wiring Connection & Measure The Resistance Of Winding.
d.) It Is Normal No Corrective Action Needed.
EXERCISES
C h o o s e T h e L e t t e r O f T h e B e s t A n s w e r

20. Question 6:
What Do You Need To Do If Error Code “E1” Shows?
a.) Check Wiring Connection & Measure The Signal 4 To 20mA.
b.) Check Wiring Connection & Measure The Resistance Of Sensor.
c.) Check Wiring Connection & Measure The Resistance Of Winding.
d.) It Is Normal No Corrective Action Needed.
EXERCISES
C h o o s e T h e L e t t e r O f T h e B e s t A n s w e r

21. Question 7:
What Controller Features A Dip Switch Setting?
a.) EC3-X33
b.) EC3-X32
c.) EXD-U00
d.) Dixell ECD Unit
EXERCISES
C h o o s e T h e L e t t e r O f T h e B e s t A n s w e r

22. Question 9:
Which Dip Switch Setting Combination Will Allow An EX8 To Function?
EXERCISES
C h o o s e T h e L e t t e r O f T h e B e s t A n s w e r
Question 8:
Which Dip Switch Setting Combination Will Allow An EX7 To Function?

Function
Dip Switch Number
12345678
A 011010--
B 100101--
C 110111--
D -------0
E -------1
F ------1-
G ------0-

23. Question 11:
For EC3-X32, “AH blinking” Indicates An Error Code For ________?
a.) High Superheat b.) Low Superheat (<1
0
F)
c.) Freeze Protection d.) Pump Down Action Cannot
Be Accomplished
Question 10:
For EC3-X32, “AL blinking“ Indicates An Error Code For ________?
a.) High Superheat b.) Low Superheat (<1
0
F)
c.) Freeze Protection d.) Pump Down Action Cannot
Be Accomplished
EXERCISES
C h o o s e T h e L e t t e r O f T h e B e s t A n s w e r

24. Question 12:
For An EX3-X32, What Do You Need To Do If An Error Code “AE(Blinking)” Shows?
a.) Check The System.
b.) Check Wiring Connection & Operation Of Valve.
c.) Check The System For Cause Of Low Pressure Such As Insufficient Load On
Evaporator.
d.) Allocate The Source, Which Does Not Let Suction Pressure Drops Below Desired
Set-Point.
EXERCISES
C h o o s e T h e L e t t e r O f T h e B e s t A n s w e r

25. Question 13:
For An EX3-X32, What Do You Need To Do If An Error Code “AF(Blinking)” Shows?
a.) Check The System
b.) Check Wiring Connection & Operation Of Valve
c.) Check The System For Cause Of Low Pressure Such As Insufficient Load On
Evaporator.
d.) Allocate The Source, Which Does Not Let Suction Pressure Drops Below Desired
Set-Point.
EXERCISES
C h o o s e T h e L e t t e r O f T h e B e s t A n s w e r

26. Question 14:
For EX3-X32, What To Do If Error Code AL(Blinking) Shows?
a.) Check The System
b.) Check Wiring Connection & Operation Of Valve
c.) Check The System For Cause Of Low Pressure Such As Insufficient Load On
Evaporator.
d.) Allocate The Source, Which Does Not Let Suction Pressure Drops Below Desired
Set-Point.
EXERCISES
C h o o s e T h e L e t t e r O f T h e B e s t A n s w e r

27. Question 15:
What Do You Need To Do If Valve Opens When EC3 Commands To Close
And Vice Versa?
a.) Check The System.
b.) Correct The Wiring Connection Of The Valve.
c.) Check The System For Cause Of Low Pressure Such As Insufficient Load On Evaporator.
d.) Allocate The Source, Which Does Not Let Suction Pressure Drops Below Desired Set-
Point.
EXERCISES
C h o o s e T h e L e t t e r O f T h e B e s t A n s w e r

28. Question 16-17:
What Courses Of Action Should You Take When An EC3 Valve Is Hunting?
1._________________________________
2._________________________________
EXERCISES

29. Question 18:
For EX3-X32, What Do You Need To Do If Error Code “AP” Shows?
a.) Data Send To The Display Is Out Of Range. Check Temperature And
Pressure Sensor.
b.) Check Wiring Connection & Operation Of Valve.
c.) Check The System For Cause Of Low Pressure Such As Refrigerant Loss.
d.) Allocate The Source, Which Does Not Let Suction Pressure Drops Below Desired Set-
Point.
EXERCISES
C h o o s e T h e L e t t e r O f T h e B e s t A n s w e r

30. Question 19:
For EX3-X32, What Do You Need To Do If Error Code “Er” Shows?
a.) Data Send To The Display Is Out Of Range. Check Temperature And
Pressure Sensor.
b.) Check Wiring Connection & Operation Of Valve.
c.) Check The System For Cause Of Low Pressure Such As Refrigerant Loss.
d.) Allocate The Source, Which Does Not Let Suction Pressure Drops Below Desired Set-
Point.
EXERCISES
C h o o s e T h e L e t t e r O f T h e B e s t A n s w e r

31. Question 20:
For EC3-X33, “E0” Error Code Stands For ________?
a.) Pressure Transmitter Errorb.) EX4 To EX8 Electrical Connection Error
c.) Temperature Sensor Error d.) Battery Error
Question 21:
For EC3-X33, “E1” Error Code Stands For ________?
a.) Pressure Transmitter Errorb.) EX4 To EX8 Electrical Connection Error
c.) Temperature Sensor Error d.) Battery Error
EXERCISES
C h o o s e T h e L e t t e r O f T h e B e s t A n s w e r

32. Question 23:
Which Dip Switch Setting Combination Will Allow An EX5 To Function?
EXERCISES
C h o o s e T h e L e t t e r O f T h e B e s t A n s w e r
Question 22:
Which Dip Switch Setting Combination Will Allow An EXD-U00 To Function With
A Start Mode?

Function
Dip Switch Number
12345678
A 011010--
B 100101--
C 110111--
D -------0
E -------1
F ------1-
G ------0-

33. Question 24-25:
What Symptoms Will Require An EC3 Driver To Be Replaced?
1.____________________
2.____________________
EXERCISES

34. THANK YOU