Hitachi RPI-0.8FSG1 Service Manual page 80

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.
# This alarm code is indicated when the instantaneous overcurrent tripping occurs 3 times including 3
in 30 minutes. Retry operation is performed up to the occurrence of 2 times.
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?
No
Check the diode
module. *1)
Good
Are the input currents
of three phases nearly
+ _
equal? ( 3%)
No (Input currents out of balance.)
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 the diode module, refer to page 1-113.
2*): Regarding the checking method for transistor module, refer to page 1-112.
3*): Regarding the checking of inverter components, refer to page 1-111 regarding electrical discharge.
1-70
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 PCB3 and restart.
immediately.
Does it trip?
Yes
Check the transistor
module. *2)
Yes
Faulty
Yes (Input currents nearly equal (±3%).)
No
No
No
(For 5 to 20HP)
No
Check the inverter
circuit board. *3)
Is there any cause
It trips.
of instantaneous
voltage decrease?
Faulty
Good
Power Supply
380-415V 50Hz
380V 60Hz
220V 60Hz
Faulty
Replace the inverter
circuit board.
Good
No
Check the
compressor.
Yes
Check the power
source capacity.
Replace the
transistor module.
Replace the inverter
circuit board.
Check the
compressor.
Replace the diode
module.
Replace the inverter
circuit board.
Check the power
supply.
Mark (a)
320
170
Check the capacity
and wiring of the
power source.
Replace the inverter
circuit board.