Hitachi RAS-(4-12)HNP(1)(E) - Abnormal Operation of the Current Sensor (RAS-(2-2.5)HVNP1; RAS-3 HVNC1)

8 Troubleshooting
262
SMGB0087 rev.0 - 12/2013
Alarm code
51
Abnormal operation of the current sensor (RAS-(2-2.5)HVNP1 / RAS-3HVNC1)
- This alarm code is displayed when the current transformer is abnormal (0 A detection or 3 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 6~10 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)
 Before the compressor is operated (at the end of position control), the current wave value is less than 3.0 A
Check the PCB1
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 PCB1.
Replace electrical
box. *2)
Compressor stops immediately
(nearly 18Hz)
Replace the
PCB1. *2)
Abnormal
N O T E
• *1) P7 is shown at 7-segment on the outdoor unit PCB.
• *2) Make sure LED1 is OFF.