Hitachi Utopia PAS-3HVRG, Руководство по обслуживанию

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1-47
TROUBLESHOOTING
“RUN” light flickers and “ALARM” is indicated on the remote control switch.
The unit No., alarm code and the unit code is alternately indicated on the set temperature section,
and the alarm code is indicated on the display of the outdoor unit PCB.
This alarm code is indicated when the any alarm code of 51, 52, 53 and 54 occurs 3 times including
3 in 30 minutes. Retry operation is performed up to the occurrence of 2 times.
Conditions: Inverter current with 150% of the rated current.
1*): Regarding the checking method for the ISPM, refer to item 1.3.3 (2).
2*): Before replacing the ISPM, refer to item 1.3.3 (1) regarding electrical discharge.
Alarm
Code
Activating Protection Against Instantaneous Overcurrent of Inverter (2)
Is the compressor
running current as
same as rated
current? (Page 1-46)
Is it 170V more
during operation
by operation of
apparatus?
Check the ISPM. *1)
Is it 170V or more
during operation?
Replace the ISPM.
*2)
Restart operation.
Does it trip soon?
Are the input currents
of single phase nearly
equal? ( 3%)
+
_
Yes
Yes
Yes
Yes
Yes
Yes
Yes It trips.
No
No
No
No
No
No
No
No
No (Input currents out of balance.)
It trips
immediately.
Faulty
Good
Is the supply voltage
220V/240V
±
10%?
Check the
compressor.
Check the power
source capacity
and wiring.
Is there any cause
of instantaneous
voltage decrease?
It trips
occasionally. It trips
occasionally.
It trips after a
certain period. It trips after a
certain period.
Turn off power and
disconnect U, V, W
from compressor
terminals.
Turn ON #1 of DSW1
on ISPM and restart.
Does it trip?
Check the
compressor.
Replace the ISPM.
*2)
Replace the ISPM.
*2)
Check the power
supply.
Check the capacity
and wiring of the
power source.
Replace the ISPM.
*2)
Yes (Input currents nearly equal (
±
3%).)