Stop State Alarm; Manual Mode Alarm; Troubleshooting - Danfoss EKE 1A User Manual

Superheat controller, Type EKE 1A, 1B, 1C, 1D

8.1.7 Stop state alarm

Table 61: Stop state alarm
Label Alarm Actions during ac‐
descrip‐ tive
tion
W002 Standby
mode

8.1.8 Manual mode alarm

Table 62: Manual mode alarm
Label Alarm description Actions during ac‐
tive
W003 Manual control

8.2 Troubleshooting

Table 63: 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 | 2022.06
Trigger (how the alarm IS
raised)
Controller is in stop state
Trigger (how the alarm IS
raised)
Controller is in manual state
Possible cause/Reaction
DI is not connected, if defined as ON/OFF hardware switch.
Sensor / transmitter error.
Alarm configuration conflict i.e. S2 sensor not defined 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 defined.
MOP set point is defined very low.
Evaporator wholly or partly iced up.
Low chilled water flow
chilled water temp too low
Missing start signal.
Startup problem.
How to clear the alarm Remark
Controller not in stop state The controller is standby due R012 Main
switch and/or DI main switch is off
How to clear the alarm Remark
Controller not in manual state The controller is manual control, no auto-
matic control is active, and many alarms
are disabled
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 difference.
• 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 orifice /piston.
• Choose the correct Refrigerant from the pre-defined
list.
• Charge the system with appropriate refrigerant capaci-
ty.
• Check for leakage in the system.
• Define 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 flow 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.
BC398828796060en-000101 | 76