Mitsubishi Electric SUZ-KA71VA4 Manual de servicio descargar pdf (Pagina 30)

D Check of compressor winding

Disconnect the connector 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 11-4.

0 [] ················Abnormal [short]

Infinite [] ·······Abnormal [open]

NOTE: Be sure to zero the ohmmeter before measurement.

* Measure the resistance between the lead wires at 3 points.

E Check of compressor operation time

Compressor starts

Abnormal

(IPM failure)

(Compressor winding short)

Abnormal

(Compressor lock out)

(Starting defect)

Abnormal

(Poor contact,)

(Outdoor P.C. board defect)

(Disconnected connector)

Abnormal

(Refrigerant circuit defect)

(Closed valve)

Normal

0 second

1 second

2 seconds

10 seconds

10 minutes

<<Judgement>>

Connect the compressor and activate the inverter. Then measure the

time until the inverter stops due to over current.

<<Operation method>>

Start heating or cooling test run.

(TEST RUN OPERATION : Refer to 11-5

<<Measurement>>

Measure the time from the start of compressor to the stop of

compressor due to overcurrent.

Is the resistance of thermistor normal?

(KA25/35/50: Refer to 11-6-1, KA60/71: 11-6-2.)

Disconnect the connector of thermistor in the outdoor P.C. board (see

below table), and measure the resistance of thermistor.

Replace the thermistor except RT64.

When RT64 is abnormal, replace the inverter

P.C. board.

Reconnect the connector of thermistor.

Turn ON the power supply and press EMERGENCY OPERATION switch.

Yes

F Check of outdoor thermistors

Does the unit operate for 10 minutes or more

without showing thermistor abnormality?

Yes

OK.

(Cause is poor contact.)

Replace the inverter P.C. board.

Thermistor Symbol

Connector, Pin No.

Board

SUZ-KA25/35/50VA4.TH SUZ-KA60/71VA4.TH

Defrost RT61 Between CN641 pin1 and pin2 Between CN671 pin1 and pin2

Inverter

P.C. board

Discharge temperature RT62 Between CN641 pin3 and pin4 Between CN671 pin3 and pin4

Fin temperature RT64 Between CN642 pin1 and pin2 Between CN673 pin1 and pin2

Ambient temperature RT65 Between CN643 pin1 and pin2 Between CN672 pin1 and pin2

Outdoor heat exchanger temperature RT68 Between CN644 pin1 and pin3 Between CN671 pin5 and pin6

OCH545

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 45 46

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Mitsubishi Electric SUZ-KA71VA4 Manual de servicio Pagina 30

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