Mitsubishi Electric SUZ-KA35VA2 Technical & Service Manual page 49

a How to check inverter/compressor
Disconnect the connector between
compressor and the intelligent power module
(IPM).
Check the voltage between terminals.
Are the voltages balanced?
Yes
Check the compressor.
b 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 balance of voltage between the terminals.
Output voltage is 50 - 130 V. (The voltage may differ according to the tester.)
<< Operation method(Test run operation)>>
1. Press EMERGENCY OPERATION switch to start COOL or HEAT mode (COOL: Press once, HEAT: Press twice).
2. Test run operation starts and continues to operate for 30 minutes.
3. Compressor operates at rated frequency in COOL mode or 74 Hz in HEAT mode.
4. Indoor fan operates at High speed.
5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts (operation frequency of compressor varies).
6. To cancel test run operation (EMERGENCY OPERATION), press EMERGENCY OPERATION switch or any button on
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 fl ashes 9 times. (Refer to 11-6.3.)
c Check of compressor
Refer to 11-5. d"Check of compressor
winding".
Is the compressor normal?
Yes
Refer to 11-5. e"Check of compressor
operation time".
Does the compressor operate continuously?
Yes
OK.
No
Measure AC voltage between the lead wires at 3 points.
No
No
See 11-5. "Check of open phase".
Replace the inverter P.C. board.
See 11-5. D "Check of compressor".
Replace the compressor.
Refer to 11-5. f"Check of compressor start failure".
49
[SUZ-KA71VA2.TH]