Mitsubishi Electric Mr. Slim SUZ-SA71VA, Техническое и сервисное руководство

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A How to check inverter/compressor
Are the voltages balanced?
Disconnect the connector between the
compressor and the intelligent power module
(SA71: 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”.
With the connector between the compressor and the intelligent power module disconnected, activate the inverter and check if
the inverter is normal by measuring the voltage balance between the terminals.
Output voltage is 50 - 130V. (The voltage may differ according to the tester.)
<< Operation method (Test run operation)>>
• For the PAR-31MAA, select “Service” → “Test Run” from the main menu to start the test run, and then select the cooling
mode.
• For details or for other information about starting the test run when using remote controllers, refer to the installation manual
for the indoor unit or the remote controller.
<<Measurement point>>
At 3 points
BLK (U) - WHT (V)
BLK (U) - RED (W)
WHT (V) - RED (W)
Note: 1. Output voltage varies according to power supply voltage.
2. Measure the voltage by analog type tester.
3. During this check, LED of the inverter P.C. board flashes 9 times. (SA71: “11-6. Test point diagram and voltage” )
Refer to 11-5. “Check of compressor
operation time”.
Does the compressor operate continuously?
OK
No
Yes
Refer to 11-5. “Check of compressor
winding”.
Is the compressor normal?
Replace the compressor.
No
Yes
C Check of compressor
B Check of open phase
11-5. TROUBLESHOOTING FLOW
Measure AC voltage between the lead wires at 3 points.
Is the compressor
operation time more than
10 seconds?
Replace the compressor.
No
Yes
Check the refrigerant circuit
OCH561