Hitachi RAS-(2-6)HVNP1(E), Service Manual

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8 Troubleshooting
272
SMGB0087 rev.0 - 12/2013
Alarm code
55
Abnormality of Inverter Module
- Actual frequency from Inverter PCB is less than 10 Hz (after inverter frequency output form PCB1 to Inverter PCB).
- This alarm is displayed when it occurs 3 times in 30 minutes. Retry operation is performed up to the occurrence of
2 times.
Condition of Activation:
This alarm is indicated when Inverter PCB is not performed normally.
Inverter PCB is normal.
Check the noise filter.
If there is no abnormality,
the normal operation can
be performed
Is alarm 55
indicated?
No
Replace inverter PCB
Turn Off power after
LED201 (for RAS-(3-6)
H(V)NPE / RAS-(8-12)
HN(P/C)(E)) or LED201
(for RAS-(4-6)H(V)NCE)
on inverter PCB is turned
OFF and restart.
Yes
N O T E
When the excessive surge current is applied to the unit due to lighting or other causes, this alarm code or the cause code
of inverter stoppage (Itc=11) will be indicated on the 7-segment display on O.U. PCB1 and the unit can not be operated. In
this case, check to ensure the surge absorber (SA) on the noise filter (NF1). The surge absorber may be damaged if the
inner surface of the surge absorber is changed to black. If the surge absorber is damaged, replace the noise filter. If the
surge absorber does not have abnormality, turn OFF the power source once and wait until turning OFF LED201 (red) on
inverter PCB for approx. 5 min. Then, turn ON again.
Lot
SP-226-1
250VAC/30A OKAYA
LFB-14930-3MA
E
Line in Load out
Max. 50
Max.
5
Max. 2.
5
Surge Absorber (SA)
(Surge Arrester)