10 Troubleshooting
Troubleshooting procedure
SMGB0091 rev.2 - 11/2015
236
Alarm code
51
Abnormal operation of the current sensor (RASC-(4-6)HNPE)
• This alarm code is displayed when the current transformer is abnormal (0 A detection or 5 A alarm condition) and the
alarm has more than three occurrences in 30 minutes.
• Condition of Activation:
-
When the frequency of the compressor is maintained at 15~18 Hz after the compressor is started, one of the
absolute values of the running current at each phase U+, U-, V+ and V- is less than 1.5 A (including 1.5 A).
-
Before the compressor is operated (at the end of position control), the current wave value is less than 5.0 A.
Check the inverter
PCB (DIP-IPM)
Restart operation.
Replace the
compressor
How is compressor
operation when
restarted?
Is the coil resistance
of compressor
normal?
Yes
No
Compressor is not operated.
Indication “P7” appears. *1)
Faulty inverter PCB
(DIP-IPM).
Replace it. *2)
Compressor stops immediately
(nearly 18Hz)
Replace the
inverter PCB
(DIP-IPM). *2)
Abnormal
?
N O T E
• *1) P7 is shown at 7-segment on the RASC unit PCB.
• *2) Perform the high voltage discharge work by referring to the item
“10.4.2 Checking procedure for the
before checking and replacing the inverter parts.