Mitsubishi SKM32ZA Specifications download pdf (Page 58)

174

(7) Inverter failure diagnosis

If the results of the diagnosis in Item (3) indicate that the inverter is defective, perform the following inspection on the inverter.

(a) Diagnosis procedure

Is there approximately DC280V

between

and

on the Printed

circuit board (POWER)?

Is there voltage at U, V and W of the

power transistor?

Is there output at CNL,CNK on the

printed circuit board(CONTROL)?

Is the fuse good?

Is the diode stack(DS1, DS2) good?

Is condenser good?

Fuse is defective

e Replace

The diode stack is defective

e Replace

Condenser is defective

e Replace

The printed circuit board (POWER)

is defective e Replace

The Printed circuit board

(POWER TRANSISTOR) is

defective e Replace

Is DC280V imposed between the

power transistors P and N

The reactor is defective

e Replace

Is there conductivity in the reactor?

YES

Inspect compressor.

YES

NOYES

YES

The printed circuit board (CONTROL)

is defective e Replace

YES

The printed circuit board (POWER)

defective e Replace

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Mitsubishi SKM32ZA Specifications Page 58