Hitachi RAS-(4-12)HNP(1)(E) - Abnormality of Inverter Module

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 lter.
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 lter (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 lter. 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. 50Max. 5
Max. 2.5
Surge Absorber (SA)
(Surge Arrester)