Air and Water cooled inverter chillers and heat pump
D-EOMZC00105-17EN
Operation Manual
72/84
EWAD TZ - EWAD TZ B -EWWD VZ
Air and Water cooled inverter chillers and
heat pump
Check if power supply is ok but LEDs are
both off. In this case replace the module
Reset
Notes
Local HMI
Network
Auto
6.6.3
Compressor VFD Fault
This alarm indicates an abnormal condition that forced the inverter to stop.
Symptom
Cause
Solution
Circuit status is Off.
The compressor does not load anymore,
circuit is immediately stopped.
Bell icon is moving on
controller’s display.
String in the alarm list:
CxCmp1 OffVfdFault
String in the alarm log:
CxCmp1 OffVfdFault
String in the alarm snapshot
CxCmp1 OffVfdFault
Inverter is operating in an unsafe condition
and for this reason the inverter must be
stopped.
Check the alarm snapshot to identify the
alarm code from the inverter. Contact your
service organization to get the problem
solved.
Reset
Notes
Local HMI
Network
Auto
6.6.4
Compressor VFD OverTemp (A/C units only)
This alarm indicates that the Inverter temperature has exceeded a safety limits and the inverter has to be
stopped in order to avoid damages to components.
Symptom
Cause
Solution
Circuit status is Off.
The circuit is stopped.
Bell icon is moving on controller’s display.
String in the alarm list:
CxCmp1 OffVfdOverTemp
String in the alarm log:
CxCmp1 OffVfdOverTemp
String in the alarm snapshot
CxCmp1 OffVfdOverTemp
Insufficient motor cooling
Check refrigerant charge.
Check if operational envelope of the unit is
respected.
Check operation of the cooling solenoid
valve
Motor temperature sensor could not
operate properly.
Check the readings of the motor
temperature sensor and check the Ohmic
value. A correct reading should be around
hundreds of Ohm at ambient temperature.
Check the electrical connection of the
sensor with the electronic board.
Reset
Notes
Local HMI
Network
Auto
6.6.5
Condensing Pressure sensor fault
This alarm indicates that the condensing pressure transducer is not operating properly.
Symptom
Cause
Solution
Circuit status is Off.
The circuit is stopped.
Bell icon is moving on controller’s display.
String in the alarm list:
CxCmp1 CondPressSen
String in the alarm log:
CxCmp1 CondPressSen
String in the alarm snapshot
CxCmp1 CondPressSen
Sensor is broken.
Check for sensor integrity.
Check correct sensors operation
according information about mVolt (mV)
range related to pressure values in kPa.
Sensor is shorted.
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. The transducer
must be able to sense the pressure
through the valve’s needle.
Check for absence of water or humidity
on sensor electrical contacts.
Check for correct plug-in of the electrical
connectors.