Hitachi RPI-0.8FSG1 Service Manual page 71

Phenomenon
Overcurrent
of Compressor
Motor
Faulty CT
Cause
Excessively Large
Running Current of
Compressor Motor
Single Phase Operation
Seizure of Compressor
Bearing
Insulation Failure of
Compressor Motor
Fault
Incorrect
Connection
Incorrect
Wiring
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.
TROUBLESHOOTING
Action
(Turn OFF Main Switch)
Operate within
+ −
380-415V 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 connector.
Correctly wiring.
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