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Mitsubishi Electric PURY-P72 Service Handbook page 313

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[ IX Troubleshooting ]
[YHMU-A]
Items to be checked
[3]
(1)
Disconnect the inverter
Check whether
output wire from the ter-
the inverter is
minals of the inverter
damaged.
board (SC-U, SC-V, SC-
(No load)
W).
(2)
Disconnect the short-cir-
cuit connector from CN6
on the inverter board.
(3)
Put the outdoor unit into
operation.
Check the inverter output
voltage after the inverter
output frequency has sta-
bilized.
[4]
Put the outdoor unit into oper-
Check whether
ation.
the inverter is
Check the inverter output volt-
damaged.
age after the inverter output
(During com-
frequency has stabilized.
pressor opera-
tion)
[5]
Remove the wire for the out-
Check the fan
door fan motor, and check the
motor ground
fan motor megger and the
fault or the
winding resistance.
winding.
[6]
(1)
Check the fan output wir-
Check the FAN
ing.
board failure.
(2)
Check the connector CN-
VDC connection.
(3)
Check the FAN board
failure.
HWE0803A
Phenomena
1)
Inverter-related problems are de-
tected.
2)
Inverter voltage is not output at the
terminals (SC-U, SC-V, and SC-W)
3)
There is an voltage imbalance be-
tween the wires.
Greater than 5% imbalance or 5V
4)
There is no voltage imbalance be-
tween the wires.
1)
There is an voltage imbalance be-
tween the wires.
Greater than 5% imbalance or 5V
1)
Fan motor megger failure
Failure when the megger is 1Mohm
or less.
2)
Fan motor disconnection
Standard: The winding resistance
is approximately several ohm.
(It varies depending on the temper-
ature, or while the inner thermo is
operating, it will be
ohm)
Connector contact failure
Board side (CNINV)
Fan motor side
Cnnector contact failure
1)
The voltage imbalance among
each motor wiring during operation
(The voltage imbalance is greater
than the larger of the values repre-
sented by 5% or 5 V.)
2)
The same error occurs even after
the operation is restarted.
- 304 -
Remedy
Connect the short-circuit con-
nector to CN6, and go to sec-
tion [1].
Replace the INV board.
Replace the INV board.
Normal
*Reconnect the short-circuit
connector to CN6 after check-
ing the voltage.
Replace the INV board.
Replace the fan motor.
Connect the connector.
Connect the connector.
Replace the FAN board.
GB
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