EN - 36
(6) Inverter abnormality
Compressor stops when the following occurs, and resumes operation in 1 min. later.
Compressor stops when abnormality occurs 10 times per hour.
1. IPM protection
2. Voltage abnormality
3. Compressor over current
4. Compressor step out
5. PFC over current
(7) Inverter communication abnormality
When the inverter-PCB cannot receive data from the CR1-EN-PCB, compressor operation stops with error
display.
For the method of resuming (resetting) compressor operation, refer to the “Explanation of Abnormality Alarm” in
“About Alarms”
Avoiding Short Cycle Operations
Short cycle operation (frequent start/stop operation) causes excessive oil carry-over during starting and causes
insuf
fi
cient lubrication.
Adjust operation cycle to avoid short cycle operation. (Adjust ON-OFF cycle to be 10 minutes or longer.)
The main cause of short cycle operation is inappropriate pressure setting on CR1-EN-PCB, suction
fi
lter clogging, and
unbalance of cooling capacity and load.
When a cooling coil is used, incorrect attachment position of the compartment temperature sensor (cold air-blow
directly hit the sensor) would become a problem in addition to the above. Review the sensor position.
Checking the Operation Condition of the Refrigeration Unit
(1) Check abnormal vibration of the refrigeration unit and piping.
(2) Check insuf
fi
cient or excessive charging of refrigerant. (Check gas cooler outlet temperature and high pressure)
(3) Check if the set value of the expansion valve (electronic expansion valve) and thermostat is appropriate.
(4) Check whether or not liquid return operation is permitted. (Check superheat of suction gas temperature)
Control Functions
Adjustment during Operation
01̲OCU-CR200VF5.indd 36
01̲OCU-CR200VF5.indd 36
2018/12/28 15:17:14
2018/12/28 15:17:14
