Mitsubishi MUY-A15NA, Руководство по обслуживанию

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43
●
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.
<< Operation method>>
Start cooling or heating operation by pressing EMERGENCY OPERATION
switch on the indoor unit. (TEST RUN OPERATION : Refer to 7-7.)
<<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 inverter P.C. board flashes 9 times.
Output voltage 115V
w
Measure AC voltage between
the lead wires at 3 points.
LED
Inverter P.C. board
(Parts side)
9-time flash
2.5-second OFF
Flashing
Check of open phase
B
MUZ-A09/12/15/17 MUY-A15/17
MUZ-A09/12/15/17 MUY-A15/17
MUZ-A09/12/15/17 MUY-A15/17
●
Measure the resistance between the terminals on the intelligent
power module.
<<Measurement point>>
at 6 points
BLK-WHT, WHT-BLK
BLK-RED, RED-BLK
WHT-RED, RED-WHT
<<Judgement>>
Infinite [
" ]···········Normal
0~dozens of ······Abnormal (short)
ohmmeter indication
Normal
(infinite)
Abnormal
(0~dozens of
" )
X1
"
X1
"
Ok
Replace the compressor.
Refer to 10-5.
E
"Check of
compressor winding".
Is the compressor normal?
No
Replace the compressor.
No
Yes
Yes
Refer to 10-5. F "Check of
compressor operation time".
Does the compressor
operate continuously?
Is the compressor
operation time more than
10 seconds?
No
Check the refrigerant circuit.
Yes
Check of compressor
D
Check of intelligent power module C
●
Disconnect the connector (CN61) between the compressor and
intelligent power module, and measure the resistance between the
compressor terminals.
<<Measurement point>>
at 3 points
BLK-WHT
BLK-RED
WHT-RED
<<Judgement>>
Refer to 10-4.
0[
" ] ···············Abnormal [short]
Infinite[ " ] ·······Abnormal [open]
NOTE 1. Be sure to zero the ohmmeter before measurement.
2. Winding resistance for each phase at 68
°
F (20 : ).
Refer to "3.SPECIFICATION".
w
Measure the resistance between the
lead wires at 3 points.
MUZ-A09/12/15/17 MUY-A15/17
Check of compressor winding
E
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