Hitachi RASC-10HNPE, Руководство по обслуживанию, Страница: 248 / 306

10 Troubleshooting
Troubleshooting procedure
SMGB0091 rev.2 - 11/2015 238
Alarm code
53
Protection activation of inverter module (RASC-(4-6)HNPE)
The inverter PCB (DIP-IPM) has a function of abnormality detection. This alarm is indicated when the inverter module
detects the abnormality 7 times in 30 minutes including 7. Retry operation is performed up to the occurrence of 6 times.
Conditions:
• The abnormal current such as short circuited, grounded or the overcurrent occurs at the inverter module.
• The temperature at inverter module increases abnormally.
• The control voltage decreases.
• The angle difference between the shaft in compressor and the shaft in the control program e60deg.
Turn OFF power, disconnect U,
V, W from compressor terminals
and restart.
Does the protecting function
activate? *3)
Yes
No
Failure of DIP-IPM.
Replace it.
No
Restart operation.
It trips
Check the
compressor
Normal
Check the compressor.
Replace if faulty.
Abnormal
Is heat exchanger
clogged?
Remove clogging or replace
heat exchanger
Faulty DIP-IPM.
Replace it.
Check the compressor
Check stop valve and
expansion valve
Check clogging of the heat
exchanger
Compressor stops
after few minutes.
(Itc=1)
(Itc=21)*
Compressor stops
immediately. (Itc=1, 12)*
Yes
Is the supply voltage
3N~ 400 V±10%?
Check the capacity and
wiring of the power source
Yes
Yes
Yes
No
No
No
No
Is voltage higher than
340V during operation?
Is voltage higher than
340V at any time?
Is the compressor
running current same as
operating current?
Is crankcase heater
ON?
Yes
* Refer to the item “Cause of inverter
stoppage (i

)” for details.
Restart operation after main
switch ON
Charge refrigerant correctly
No
Is refrigerant
overcharged?
Is expansion valve of indoor unit
open-locked in cooling operation?
Is expansion valve of outdoor unit
open-locked in heating operation?
No
No
No
Replace expansion valve
Yes
Yes
Yes
Yes
Is the discharge
pressure high?
?
N O T E
• *1): Perform the high voltage discharge work by referring to the paragraph “RASC-(4-6)HNPE” in section “10.4.2 Checking procedure
for the inverter PCB”.
• *2): Regarding replacing or checking method for the inverter PCB, refer to the paragraph “RASC-(4-6)HNPE” in section “10.4.2
Checking procedure for the inverter PCB”.
• *3): Turn ON the number 1 switch of the dip switch DSW1 on DIP-IPM when restarting with disconnecting the terminals of the
compressor. After troubleshooting, turn OFF the number 1 switch of the dip switch DSW1 on DIP-IPM.