Envicool EMW90HDNC1U - Reference; Barcode; Coolant Specifications

User Manual
7 Fault Management
42
EMW90HDNC1U Air-cooled Chiller
Alarm Name
Generation
Condition
Possible Causes Processing Method
Abnormal bus voltage.
Replace the frequency
converter.
Rectifier bridge and buffer
resistance are abnormal.
Replace the frequency
converter.
Abnormal driving board.
Replace the frequency
converter.
Abnormal control panel.
Replace the frequency
converter.
Freq
Converter
Phase Loss
Locking
Three frequency
converter phase loss
alarms occurred
within one hour.
The lead from frequency
converter to motor is
abnormal.
Troubleshoot the lead
connection.
When the motor is
running, the three-phase
output of the frequency
converter is unbalanced.
Replace the motor.
Abnormal driving board.
Replace the frequency
converter.
Freq
Converter
Other Fault
Locking
Three other frequency
converter fault alarms
occurred within one
hour.
The electric control wiring
of compressor frequency
converter is loose, or the
cable is damaged.
Tighten the electrical control
wiring or replace the cable.
Compressor frequency
converter is damaged.
Replace the compressor
inverter.
Inverter selection is too
small.
Choose a frequency converter
with higher power level.
Abnormal
Power Down
After the water chiller
is directly powered off
without shutdown,
power on the water
chiller again.
User operation is not
standard, and power is
cut off directly without
shutdown.
No processing required.
The alarm will be automatically
released after a few seconds.
Temporary power failure
of power supply network.
No processing required.
The alarm will be automatically
released after a few seconds.
Envir Temp
Failure
The ambient
temperature sensor
cannot detect the
temperature normally.
The electrical control
wiring of the ambient
temperature sensor is
loose or the cable is
damaged.
Tighten the electrical control
wiring or replace the cable.
The ambient temperature
sensor is damaged.
Replace the low pressure
sensor.
Abnormal
Cooling
System
The pressure ratio
between the high
pressure side and the
low pressure side of
the system is too low
Compressor failure.
Replace the compressor.
The compressor electrical
control wiring is loose, or
the cable is damaged.
Tighten the electrical control
wiring, or replace the cable.
Low
The suction superheat
Coolant flow is too low.
Replenish coolant.