Hitachi FSG Series Service Manual page 57

Phenomenon
Excessively Large Running
Current of Compressor Motor
Single Phase Operation
Overcurrent of
Compressor
Motor
Seizure of Compressor
Faulty CT
Cause
Bearing
Insulation Failure of
Compressor Motor
Fault
Incorrect
Connection
Incorrect
Wiring
TROUBLESHOOTING
Check Item
Excessively High or Low
Voltage of Power Source
Imbalance Among Phase
at Power Source
Excessively High
Discharge Pressure
Melted Fuse for Power
Source
Looseness of Screws for
Power Source
Deterioration of Contact of
Magnetic Switch for
Compressor
Locked-up?
Measure insulation
resistance.
Check continuity during
stoppage.
Measure resistance by
tester.
Check wiring.
1
49
Action
(Turn OFF main switch)
operate within
380-145V±10%(50Hz)
380V±10%(60Hz)
220V±10%(60Hz)
Adjust voltage between
each phase.
Check for causes.
Replace the fuses.
Tightly fix screws.
Replace magnetic
contactor.
Replace compressor.
Replace compressor.
Replace CT when faulty.
Remove looseness and
replace connectors.
Correctly wiring.