Hitachi RWM-(H)FSN3E, Руководство по обслуживанию

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12 Troubleshooting
SMGB0070 rev. 1 - 08/2011
378
Alarm code
48
Overcurrent protection activation (RAS-(3-10)H(V)RNME-AF)
No
Check the compressor
Restart
operation.
Does it trip soon?
Yes
Turn OFF power
and disconnect U,
V, W from compressor
terminals.
Turn ON #1 of DSW1 on PCB2
(IPM or dipIPM) and restart.
Does it trip? *1)
Is there any
cause of ins-
tantaneous voltage
decrease?
No
It trips after a certain period
It trips immediately
In case of 400V 50Hz:
Is the power supply voltage 400V ±10%?
In case of 380-415V/50Hz
Is the power supply voltage 380V ±10% or 415V ±10%?
In case of 230V/50Hz:
Is the power supply voltage 230V ±10%?
In case of 400V 50Hz:
Is the power supply voltage 340V during operation?
In case of 380-415V/50Hz:
Is the power supply voltage 323V during operation?
In case of 230V/50Hz:
Is the power supply voltage 187V during operation?
Is it 170V (single phase) or 340V (3 phases) or
more during operation when other devices are operating?
Is the compressor running current the same as
rated current?
Yes
Yes
Yes
Check the capacity and wiring
of the power source.
Check the power
source capacity.
Replace the PCB2
(IPM or dipIPM). *1)
Yes
Yes, it tips
Yes
Is current
applying to crank -
case heater?
Restart operation after
applying current.
No
Is refrigerant
charged
excessively?
Charge refrigerant
correctly.
Yes
Yes
Is lock of indoor expansion valve
opened at cooling operation?
Is lock of outdoor expansion valve
opened at heating operation?
Restart expansion
valve.
Yes
Check the compressor.
No
Is pressure
excessively high?
Yes
Check the stop valves
and expansion valve.
Check for clogging at
heat exchanger.
Check the fan.
No
No
No
No
*1) Perform the high voltage discharge work by referring to the item
Procedure of checking other main parts
before chec-
king and replacing the inverter PCB.