Overcurrent Protection Activation For Ras-(2-2.5)Hvnp1 And Ras-3Hvnc1 - Hitachi RAS-(3-6)HVNC1(E) Service Manual

8 Troubleshooting
48
Alarm code
Yes
Restart operation.
Does it trip soon?
It trips
immediately
It trips after a
certain period
In case of 1~230V/50Hz:
Is the power supply voltage 230V ±10%?
In case of 1~230V/50Hz:
Is the power supply voltage 187V during
operation?
Is it 170V (single phase) or more
during operation when other devices
are operating?
Is the compressor running current the
same as rated current?
Is current applying to
crankcase heater?
260
SMGB0087 rev.0 - 12/2013

Overcurrent protection activation for RAS-(2-2.5)HVNP1 and RAS-3HVNC1

Turn OFF power and check
LED1 is OFF. Disconnect relay
connectors from compressor.
Turn ON number 1 of DSW301 on
inverter PCB2 and restart.
Does it trip?
Yes, it trips
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
charged excessively?
Is lock of indoor expansion
valve opened at cooling
Is lock of outdoor expansion valve
opened at heating operation
Is there any cause of
No
instantaneous voltage
decrease?
Check the capacity
and wiring of the
Yes
Is refrigerant
No
operation?
No
Is pressure Yes
excessively high?
No
Check the
compressor
Yes
Check the power
source capacity
Replace the
electrical box
power source
Restart operation
after applying
current
Charge refrigerant
correctly
Yes
Restart expansion
valve
Check the
compessor
Check the stop
valves and
expansion valve
Check for clogging
at heat exchanger
Check the fan