Danfoss EKE 1A User Manual page 80

Superheat controller, Type EKE 1A, 1B, 1C, 1D
ID Symptom
22 Valve does not move
23 Valve rotates in opposite di-
rection
24 Valve is overdriven to Zero
position
25 Fluctuating pressure signal
26 Compressor thermal cut out
(Mop is not working or go-
ing higher than set value)
27 LOP protection doesn't work
at low pressure
28 Controller is in safe state
(check LED or display)
29 Controller freeze. nothing
happens
30 No communication (Indica-
ted by LEDs)
© Danfoss | Climate Solutions | 2022.06
Possible cause/Reaction
Valve neutral zone has been defined.
Loose or incorrect M12 cable connection.
Change in valve setting or other configurations.
Incorrect voltage supplies to the controller.
Valve got stuck.
Valve motor is damaged; resistance of the motor varies a
lot than specified for a valve.
Valve M12 cable wire is wrongly connected to the control-
ler.
Wrong connection of wires at cable joint, if there is exten-
sion cable to the main Valve cable.
EKE performs valve calibration in the following situation as
a normal procedure
Wrong defining of valve type.
Valve overdrive feature is enabled, and OD is dosed to fully
closed position or the overdriving timer is ON.
Alarm or Error condition will bring the valve to Zero posi-
tion and stop regulation
On setting DI = Off when DI is set as ON/OFF regulation
Change in load of the system.
Faulty pressure sensor.
Flash gas in the system.
MOP is not enabled, or wrongly defined.
Change in operating condition.
if low superheat and low suction pressure exist same time
for some time, LOP function is disabled.
Fast change in operating condition.
Internal error i.e., EEPROM error in controller software ex-
ceptions.
loose connections.
Incorrect voltage supplies to the controller.
Wrong Modbus settings.
Loose connection or no termination.
Check power supply to EKE controller
Solution
• Check Valve parameter in chapter Stepper motor valve.
• Check proper and firm connection of valve cable wires
to ENE terminals.
• Also check section Valve rotates in opposite direction' .
• Check for the correct valve parameters.
• Check for the correct state of R12 ON/OFF regulation or
Dl connection.
• If Al or Modbus signal is used, make sure that the cor-
rect signal is connected to the controller.
• Check the power supply and measure input voltage to
the controller.
• Check the valve installation.
• Check for the dirt inside the valve.
• Check the resistance in the motor between each coil.
• Make sure you consider some tolerances for cable or
temperature deviation.
• Replace the valve.
• Check the connection of wire color codes as stated in
Installation guide.
• For other valves than Danfoss, check with valve suppli-
er for the right connection.
• Check for the right color configuration at the joint.
• Normal operation
• Observe the change in the load of the system.
• Replace faulty pressure transmitter.
• Check the section flash gas.
• Check mop settings.
• Observe the operating condition.
• Controller need time to adjust to the stable condition.
• Check operating condition and settings.
• Controller need time to adapt to the change condition.
• Power cycle the controller, if continue to get the same
error then replace controller.
• Check the connection in the EKE.
• Check the power supply and measure input voltage to
the controller.
• Power cycle controller and observe the LEDs, IF no LEDs
are lighting during power cycle, replace controller.
• Check Modbus address, baud rate, and protocol.
• EKE only supports Modbus RS 485 RTU, it does not sup-
port Modicon conventions.
• Check the Modbus terminals and use terminations.
• If off, power on the controller
BC398828796060en-000101 | 80