Air and Water cooled inverter chillers and heat pump
EWAD TZ - EWAD TZ B - EWWD VZ
Air and Water cooled inverter chillers
and heat pump
D-EOMZC00105-17EN
Operation Manual
69/84
6.5.3
High Compressor Vfd Temperature fault (A/C units only)
This alarm is generated to indicate that the Vfd temperature is too high to allow the compressor to run.
Symptom
Cause
Solution
Circuit status is Off.
The circuit is switched off with the normal
shutdown procedure.
Bell icon is moving on controller’s display.
String in the alarm list:
CxCmp1 VfdOverTemp
String in the alarm log:
CxCmp1 VfdOverTemp
String in the alarm snapshot
CxCmp1 VfdOverTemp
Cooling solenoid valve is not operating
properly.
Check electrical connection of the solenoid
valve.
Check refrigerant charge. Low refrigerant
charge can cause overheating of the Vfd
electronic.
Check for obstructions in the pipe.
Vfd Heater not properly connected.
Check if Vfd heater is switched off when
the Vfd temperature increases.
Check if the contactor that commands the
Vfd heater can switch propertly.
Reset
Notes
Local HMI
Network
Auto
6.5.4
Liquid Temperature Sensor fault (W/C units only)
This alarm is generated to indicate that the sensor is not reading properly.
Symptom
Cause
Solution
Circuit status is Off.
The circuit is switched off with the normal
shutdown procedure.
Bell icon is moving on controller’s display.
String in the alarm list:
CxCmp1 OffLiquidTempSen
String in the alarm log:
CxCmp1 OffLiquidTempSen
String in the alarm snapshot
CxCmp1 OffLiquidTempSen
Sensor is shorted.
Check for sensor integrity.
Check
correct
sensors
operation
according information about kOhm (k
)
range related to temperature values.
Sensor is broken.
Check if sensor is shorted with a
resistance measurement.
Sensor is not properly connected (open).
Check for correct installation of the sensor
on refrigerant circuit pipe.
Check for absence of water or humidity on
sensor electrical contacts.
Check for correct plug-in of the electrical
connectors.
Check for correct sensors wiring also
according with electrical scheme.
Reset
Notes
Local HMI
Network
Auto
6.5.5
Low Compressor Vfd Temperature fault (A/C units only)
This alarm is generated to indicate that the Vfd temperature is too low to allow the compressor to run safely.
Symptom
Cause
Solution
Circuit status is Off.
The circuit is switched off with the normal
shutdown procedure.
Bell icon is moving on controller’s display.
String in the alarm list:
CxCmp1 VfdLowTemp
String in the alarm log:
CxCmp1 VfdLowTemp
String in the alarm snapshot
CxCmp1 VfdLowTemp
Cooling solenoid valve is not operating
properly.
It’s
always
open
when
compressor runs.
Check electrical connection of the solenoid
valve.
Check operation of the valve to see if it can
close properly.
Check operating cycles of the valve. It has
a limited number of cycles.
Vfd heater is not working.
Check if the Vfd heater is powered.
Check if the Vfd heater is commanded on
when Vfd temperature is low.
Reset
Notes
Local HMI
Network
Auto