Mitsubishi SUZ-KA35VA Service Manual page 88

a How to check inverter/compressor
Disconnect the connector (CN61) between
compressor and the intelligent power module
(IPM).
Check the voltage between terminals.
Are the voltages balanced?
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.
The output voltage values have the tolerance of ± 20%.
<< Operation method>>
Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit. (TEST RUN OPERATION
: Refer to page 31 for SLZ/SUZ and page 37 for SEZ/SUZ.)
<<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 12-6-3. (KA25/35VA) or 12-6-7.)
d Check of compressor
e
Refer to "Check of compressor winding".
Is the compressor normal?
Refer to f "Check of compressor operation
time".
Does the compressor operate continuously?
OK.
OC322G
No
Yes
No
Yes
No
Yes
[SUZ-KA25/35VA(H)R1.TH
See b "Check of open phase".
Replace the inverter P.C. board.
See d "Check of compressor".
9-time flash
Replace the compressor.
Is the compressor
operation time more than
10 seconds?
Yes
Check the refrigerant circuit.
88
SUZ-KA50VAR2.TH]
2.5-second OFF
Replace the compressor.
No