Abnormal Operation Of The Current Sensor (Ras-(3-6)H(V)N(P/C)1E) - Hitachi RAS-(3-6)HVNC1(E) Service Manual

8 Troubleshooting
51
Alarm code
- 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:
Š 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 1.5A)
Š Before the compressor is operated (at the end of position control), the current wave value is less than 5.0 A.
Restart operation.
How is compressor
operation when
restarted?
N O T E
• *1) P7 is shown at 7-segment on the outdoor unit PCB.
• *2) Perform the high voltage discharge work by referring to the item
Checking procedure for the electronic expansion valve
263
SMGB0087 rev.0 - 12/2013

Abnormal operation of the current sensor (RAS-(3-6)H(V)N(P/C)1E)

Compressor stops immediately
Compressor is not operated.
Indication "P7" appears. *1)
Is the coil resistance
Check the inverter
(nearly 18Hz)
No
of compressor
normal?
Yes
Abnormal
PCB
Procedure of checking other main
before checking and replacing the inverter parts.
Faulty inverter
PCB.
Replace it. *2)
Replace the
compressor
Replace the
inverter PCB. *2)
parts, in part
8