Danfoss EKE 1A User Manual page 78

Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D
Label Alarm name
E117 Valve emergency speed too fast
E118 Valve emergency speed too slow
E119 Valve start speed too slow
A999 DI1 unstable input
A998 DI2 unstable input
A983 DI3 unstable input
E125 AI5 cant operate with AKS sensor
E126 Valve short circuit or driver too hot
A982 Thermostatic signal missing
A981 SH control signal missing
E123 Low supply voltage
E132 No sensor con gured for S2
E133 No transmitter con gured for Pe
E134 Ext. ref con guration error
DI H/C cant operate with the ther-
E135
mostat
A984 PWR Backup module failure
A985 Replace PWR Backup module
8.2 Troubleshooting
Table 71: Troubleshooting
ID Symptom
1 Regulation does not start on
using control modes i.e.,
MSS
2 Suction pressure too low
3 Low pressure cut out due to
compressor cut in and cut
out
© Danfoss | Climate Solutions | 2024.08
Modbus PNU
1903
1903
1903
1903
1903
1903
1903
1903
1903
1903
1904
1904
1904
1904
1904
1904
1904
Possible cause/Reaction
DI is not connected, if de ned as ON/OFF hardware switch.
Sensor / transmitter error.
Alarm con guration con ict i.e. S2 sensor not de ned or
no refrigerant selected.
Alarm: standby mode active i.e. Parameter R012 is OFF.
Pressure drops across evaporator too high.
Lack of sub cooling ahead of expansion valve.
Evaporator superheat too high.
Pressure drop across the expansion valve less than valve is
sized for.
Expansion valve too small.
Expansion valve block with foreign material.
Wrong selection of Refrigerant in the controller settings.
Lack of Charge in the system.
Pressure transmitter ranges or type is wrongly de ned.
MOP set point is de ned very low.
Evaporator wholly or partly iced up.
Low chilled water ow
chilled water temp too low
Missing start signal.
Startup problem.
Bit number Can Index
13 5507
14 5507
15 5507
0 5507
1 5507
2 5507
4 5507
5 5507
6 5507
7 5507
8 5507
9 5507
10 5507
11 5507
12 5507
13 5507
14 5507
Solution
• Turn on DI switch.
• Check and clear alarm.
• Clear and clear Alarm.
• Set R012 main switch to 1.
• Check refrigerant ahead of expansion valve, If valve is
placed much higher than condenser outlet.
• Check pressure di erence.
• Limit max opening degree of the valve setting in con-
troller.
• Check refrigeration system capacity and compare with
expansion valve capacity.
• Use proper valve size, Suitable for the system.
• Check the section " High Superheat".
• Check pressure drop across expansion valve. Replace
with larger valve.
• Check refrigeration system capacity and compare with
expansion valve capacity. Replace with larger valve if
necessary.
• Check selected valve type in the controller valve list.
• Remove valve and examine the ori ce /piston.
• Choose the correct Refrigerant from the pre-de ned
list.
• Charge the system with appropriate refrigerant capaci-
ty.
• Check for leakage in the system.
• De ne the correct pressure range.
• Check the MOP setting, if Modbus is used, check if the
values have been scaled as indicated in the parameter
list
• De-ice evaporator.
• Check ow as per design
• Check temp set points as per Design
• Check for digital input DI signal or its settings.
• Check section start- up problem and its solution.
Can Subindex Bit number
6E 5
6E 6
6E 7
6E 8
6E 9
6E 10
6E 12
6E 13
6E 14
6E 15
6E 16
6E 17
6E 18
6E 19
6E 20
6E 21
6E 22
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