Mitsubishi Electric PURY-P72TYJMU-A Service Handbook page 322

[ IX Troubleshooting ]
[TJMU-A]
Items to be checked
[3] <P72 model>
Check whether
the inverter is
damaged.
(1) Disconnect the inverter
(No load)
output wire from the ter-
minals of the INV board
(SC-U, SC-V, SC-W).
(2) Disconnect the short-cir-
cuit connector from CN6
on the INV board.
(3) Put the outdoor unit into
operation.
Check the inverter output
voltage after the inverter
output frequency has sta-
bilized.
<P96, P120 models>
(1) Disconnect the inverter
output wire from the out-
put terminals (U, V, W) of
the IPM.
(2) Turn on SW1-1 on the
INV board.
(3) Put the outdoor unit into
operation.
HWE0913A
Phenomena
1) Inverter-related problems are de-
tected.
2) Inverter voltage is not output.
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) Inverter-related problems are de-
tected.
2) Inverter voltage is not output.
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.
- 313 -
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
checking the voltage.
Turn off SW1-1 and go to [1]
Check the connection be-
tween the IPM and the
CNIPM on the INV board.
Replace the IPM.
If the problem persists, re-
place the INV board.
Replace the IPM.
If the problem persists, re-
place the INV board.
Normal
*Turn off SW1-1
GB