Hitachi RPI-0.8FSG1 Service Manual page 82

TROUBLESHOOTING
Alarm
Code
G "RUN" light flickers and "ALARM" is indicated on the remote control switch.
G The unit No., alarm code and the unit code is alternately indicated on the set temperature section,
and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.
# In case that the abnormality of alarm code 51, 52, 53 or 54 occurs three times within 30 seconds, the
alarm code of abnormality occurred for the third time is indicated. Retry operation is performed up to
second time of abnormality occurrence.
Conditions: Inverter current is 150% of the rated current.
No
Restart operation.
Does it trip soon?
No
It trips after a It trips after a
certain period. certain period.
It trips It trips
occasionally. occasionally.
Is the compressor
running current as
same as rated
current?
Check ISPM. *1)
Are the input currents
of three phases nearly
+ _
equal? ( 3%)
Is the supply voltage
380-415V±10% or
220V±10%?
Yes
Is it (a)V or more
during operation?
Yes
Is it (a)V more
during operation
when other devices
are operating?
Yes
1*): Regarding replacing or the checking method for ISPM, refer to page 1-114.
2*): Before the checking of ISPM, refer to page 1-111 regarding electrical discharge.
1-72
Protection Activation Against Instantaneous Overcurrent of Inverter (2)
Turn off power and
disconnect U, V, W
Yes
from compressor
terminals.
Turn ON #1 of DSW1
It trips
on ISPM and restart.
immediately.
Does it trip?
Yes
Yes
No
Faulty
Good
Yes (Input currents nearly equal (±3%).)
No (Input currents out of balance.)
No
No
No
(For 24 and 30HP)
No
Is there any cause
It trips.
of instantaneous
voltage decrease?
Power Supply
380-415V 50Hz
380V 60Hz
220V 60Hz
No
Check the
compressor.
Yes
Check the power
source capacity.
Replace ISPM. *2)
Check the
compressor.
Replace ISPM. *2)
Replace ISPM. *2)
Check the power
supply.
Mark (a)
320
170
Check the capacity
and wiring of the
power source.
Replace ISPM. *2)