Mitsubishi Electric MUZ-GB50VA, Руководство по обслуживанию

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11-5. TROUBLESHOOTING FLOW
MUZ-GB50VA-
E1
/
E2
A How to check inverter/compressor
Are the voltages balanced?
Disconnect the connector (CN61) between
compressor and the intelligent power module
(IPM).
Replace the inverter P.C. board.
Check the voltage between terminals.
Check the compressor. See 11-5. “Check of compressor”.
No
Yes
See 11-5. “Check of open phase”.
MUZ-GB50VA-
E3
Measure the voltage between each lead wire lead-
ing to the compressor.
U (BLK) - V (WHT)
V (WHT) - W (RED)
W (RED) - U (BLK)
Is voltage output on right table?
Yes
No
Disconnect the terminal of the compressor. 3 minutes after turn-
ing on the power supply, start EMERGENCY OPERATION.
After the outdoor fan starts running, wait for 1 minute or more before
measuring the voltage.
The output voltage values have the tolerance of ±20%. •
•
Is output balanced?
Yes
No
Is the input voltage to the outdoor electronic control
P.C. board 370 V or more?
Yes
No
Replace the power board.
Turn off power supply of indoor and outdoor unit, and
measure the compressor winding resistance between
the compressor terminals.
Is the resistance between each terminal normal?
Yes
No
Replace the compressor.
Reconnect the lead wire of compressor, and turn on power
supply to indoor and outdoor unit.
3 minutes later, starts EMERGENCY OPERATION.
Clarify the causes by counting time until the inverter stops.
0 to 10 seconds: compressor rare short
10 to 60 seconds : compressor lock
60 seconds to 5 minutes: refrigerant circuit defective
5 minutes or more: normal