Hitachi RASC-4HNPE Service Manual page 245

10 Troubleshooting
Troubleshooting procedure
48
Alarm code
It trips
immediately
Yes
Restart operation.
Does it trip soon?
It trips after a
certain period
Is the power supply voltage 380V ±10% or 415V ±10%?
Is the power supply voltage 323V during operation?
Is it 340V 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?
?
N O T E
*1): Perform the high voltage discharge work by referring to sections
235 SMGB0091 rev.2 - 11/2015
Overcurrent protection activation
Turn OFF power and disconnect
U, V, W from compressor
terminals. Turn ON number 1 of
DSW1 on DIP-IPM (4-6HP) or PCB4
(8/10HP) and restart. Does it trip?
*1)
Yes, it trips
Yes
Yes
Yes
Yes
No
Yes
Is refrigerant charged
Is lock of indoor expansion valve
opened at cooling operation?
Is lock of outdoor expansion valve
opened at heating operation
Is there any cause of
No
instantaneous voltage
decrease?
Yes
No
No
No
No
Yes
excessively?
No
Yes
No
Yes
Is pressure
excessively high?
"RASC-(4-6)HNPE" and "RASC-(8/10)HNPE".
No
Check the
compressor
Check the power
source capacity
Replace the
DIP-IPM (4-6HP) or
PCB4 (8/10HP). *1)
Check the capacity
and wiring of the
power source
Restart operation
after applying
current
Charge refrigerant
correctly
Restart expansion
valve
Check the
compressor
Check the stop
valves and
expansion valve
Check for clogging
at heat exchanger
Check the fan
10