Technical data

Displayed Reason for
Shutdown
Control Function Possible Cause Recommended Action
AC UNDERVOLTAGE
Motor current below 10%
for more than 25 seconds
during RUN mode
Low AC voltage at control
centre
Check power supply
Faulty Start Relay Check Relay1R
Low motor current Check CT operation and
wiring
Check motor
HIGH LINE VOLTAGE /
LOW LINE VOLTAGE
(Solid State Starter only)
Line Voltage for any phase
above/below voltage limit
for more than 20 seconds
Power supply fault Check mains supply
POWER FAULT
Motor controller contact
cycling in less than 3
seconds
Power supply fault Check mains supply
Motor fault Check motor
FLOW SWITCH
Flow switch contacts open
for more than 2 seconds
during RUN mode
Lack of water flow Check chilled liquid pump
operation
Check for flow blockage or
shut water service valve
Flow switch fault Check flow switch
operation and wiring
PROGRAM INITIATED
RESET
Microprocessor signal error Electrical noise Check for possible sources
of electrical noise
interference
Refrigerant System Control Centre Initiated Shutdowns - Manual Reset Restart
Displayed Reason for
Shutdown
Control Function Possible Cause Recommended Action
HIGH PRESSURE
High pressure cut-out
switch open
High condenser water
temperature
Check cooling tower
operation
Low condenser water flow Check service valves are
open fully
Check pump operation
High evaporator load Check chilled water
temperature
Blocked dirty condenser
tubes
Clean tubes
Air in condenser Change refrigerant charge
HIGH DISCHARGE TEMP
Discharge temperature
more than 100 °C
High discharge pressure See HIGH PRESSURE
High suction superheat Check chilled water
temperature
Compressor lubrication
failure
Check oil system
FAULTY DISCHARGE
TEMP SENSOR
Discharge temperature
measured as below -1.2 °C
Defective discharge
temperature sensor or
wiring
Check sensor operation
and wiring
8-2 035L02381-GB0