Mitsubishi Electric MR-G50J-SS-NZ Service Manual page 21

Inverter-related indication "Compressor does not operate"
Error
Abnormality
code
Trouble of
e50
inverter circuit
Bus-bar
e51
voltage is
abnormal.
Trouble of
e52
inverter software
reset function
•Abnormal start-
e53
up
•Abnormal
synchronization
•Trouble of
overcurrent
detection
Possible cause Symptom
•When there is
Compressor
any trouble in the
does not
circuit which
rotate.
detects phase
current of com-
pressor.
•Power supply
Compressor
voltage is
does not
abnormal. rotate.
•Defective reactor
on the N/F board
•When the inverter Compressor
driving software does not
malfunctions. rotate.
Compressor
•Compressor
does not
motor gets locked.
rotate.
•Defective circuit
on control board
•Defective contact
of CN50G on
control board
•Defective contact
of machine
chamber 6-pin
connector
Replace the control board.
Start
Measure the voltage of
power supply.
280V or more
Arrange power supply to make the voltage
within 180-280V and conduct the following
checks.
Does AC230V run
between CN51 ter-
minals 1 and 3, on
the control board?
(See page 32.)
Yes
Replace the
control board.
Unplug the power cord and then plug it in 10 minutes.
Check the error code by performing the ice making test operation.
e52 display again.
Replace the control board.
Start
Disconnect 6-pin
connector in
machine cham-
ber to check
No
resistance
between each
terminal of 1, 2
and 3: Are they
approx. 9.3'
(20:)?
Yes
*Replace lead wire assembly C.
Check the connection of the
*Is compressor
No
connector CN50G on the
energized at
control board or the machine
startup?
chamber 6-pin connector.
Yes
Exchange
the unit control board.
*If control board is normal, compressor is energized
every 10 minutes.
Compressor vibrates at startup when it is being ener-
gized. Touch it with your hand to check.
21
Treatment
Arrange
160V or
power sup-
more
ply to obtain
the rated
voltage,
180-280V.
Check the
connection
Abno-
Connect
No
rmal
between filter
them
board and
properly.
control board.
Normal
Replace the
filter board.
No error code display
Explanation to customer
Measure the
resistance of
compressor's
winding
No
between each
terminal of 1,
2 and 3: Are
they approx.
9.3' (20:)?
Yes
Abnormal
Normal
Replace the
Exchange
the unit
Connect them
properly.