Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 350

Items to be checked
[3] Perform the following:
Check whether (1) Reconnect the connector
the inverter is that was removed in section
damaged. [1].
*Perform this (2) Disconnect the compressor
check if an error wiring.
occurs immedi- (3) Turn on SW1-1 on the com-
ately before or pressor INV board.
after turning on Operate the outdoor unit after
the compressor. above steps.Check the inverter
output voltage.
*It is recommended to use the
tester used in the 9.[4] -5-(5)
IPM troubleshooting when
checking the inverter output volt-
age.
Measure voltage when the com-
pressor inverter output frequen-
cy is stable.
[4] Turn on the outdoor unit.
Check whether Check the inverter output volt-
the inverter is age.
damaged.Per- *It is recommended to use the
form this check tester used in the 9.[4] -5- (5)
if an error oc- IPM troubleshooting when
curs during op- checking the inverter output volt-
eration. age.
*Measure voltage when the
compressor inverter output fre-
quency is stable.
Phenomena
1) IPM/overcurrent breaker
trip
(4250 Detail code No.
101, 102, 103, 104, 105,
106, and 107)
2) The voltage imbalance
across all wiring
There is a high possibility
of an inverter circuit error
if the voltage imbalance
across all wiring is great-
er than the larger of the
values represented by
5% or 5V.
3) No voltage imbalance
across all wiring
1) The voltage imbalance
across all wiring
There is a high possibility
of an inverter circuit error
if the voltage imbalance
across all wiring is great-
er than the larger of the
values represented by
5% or 5V.
2) No voltage imbalance
across all wiring
- 341 -
[ IX Troubleshooting ]
Remedy
Refer to item [5] for inverter circuit
trouble.
See item [2].
Proceed to item [5], however if
there is no problem in section [2].
Replace the compressor if there is
no problem in section [5].
Refer to item [5] for inverter circuit
trouble.
See item [2].
Proceed to item [5], however if
there is no problem in section [2].
Replace the compressor if there is
no problem in section [5].