Envicool EMW90HDNC1A - Page 43

User Manual
7 Fault Management
EMW90HDNC1A Air-cooled Chiller
41
Alarm Name
Generation
Condition
Possible Causes
Processing Method
Sudden loading during
acceleration/deceleration/
operation leads to
acceleration/deceleration/
constant speed
overcurrent.
Cancel the sudden load.
The deceleration time is
too short, resulting in
deceleration overcurrent.
Increase deceleration time.
Freq
Converter
Over Temp
Locking
Three frequency
converter over
temperature alarms
occurred within one
hour.
The cooling air duct of
compressor frequency
converter is blocked.
Clean the cooling air duct of
compressor frequency
converter.
The ambient temperature
is too high.
Lower the ambient temperature.
The fan is damaged.
Replace the frequency
converter.
Damaged thermistor.
Replace the frequency
converter.
Inverter module is
damaged.
Replace the frequency
converter.
Freq
Converter
Over Voltage
Locking
Three frequency
converter over voltage
alarms occurred
within one hour.
Input voltage is on the
high side.
Adjust the voltage to the normal
range.
The
acceleration/deceleration/
constant speed
overvoltage is caused by
external force dragging
the motor.
Cancel external power or install
braking resistor.
Acceleration overvoltage
is caused by short
acceleration time.
Increase the acceleration time.
Shorter deceleration time
leads to deceleration
overvoltage.
Increase deceleration time.
Acceleration/deceleration
overvoltage caused by no
additional braking
resistor.
Add braking resistor.
Freq
Converter
Undervoltage
Locking
Three frequency
converter under
voltage alarms
occurred within one
hour.
Instantaneous power
failure.
The alarm will be automatically
released after fault recovery.
The input terminal voltage
of the frequency
converter is not within the
specification
requirements.
Adjust the voltage to the normal
range.