Mitsubishi Electric PURY-P72 Service Handbook page 331
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- Service handbook (403 pages) ,
- Service handbook (200 pages) ,
- Service handbook (404 pages)
Table of Contents
[ IX Troubleshooting ]
[YJMU-A]
(2) Inverter output related troubles
Items to be checked
[1]
(1)
Disconnect the invert-
Check the
er output wire from
INV board er-
the terminals of the
ror detection
inverter board (SC-U,
circuit.
SC-V, SC-W).
(2)
Put the outdoor unit
into operation.
[2]
Disconnect the compressor
Check for
wiring, and check the com-
compressor
pressor Meg, and coil resis-
ground fault
tance.
or coil error.
[3]
(1)
Disconnect the invert-
Check wheth-
er output wire from
er the inverter
the terminals of the
is damaged.
inverter board (SC-U,
(No load)
SC-V, SC-W).
(2)
Disconnect the short-
circuit 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 stabi-
lized.
HWE09130
Phenomena
1)
Overcurrent error
(4250 Detail code No. 101, 104,
105, 106, and 107)
2)
Logic error
(4220 Detail code No. 111)
3)
ACCT sensor circuit failure
(5301 Detail code No.117)
4)
IPM open
(5301 Detail code No.119)
1)
Compressor Meg failure
Error if less than 1 Mohm.
2)
Compressor coil resistance failure
Coil resistance value of 0.71 ohm
(20°C [68°F]): - P72 model
Coil resistance value of 0.32 ohm
(20°C [68°F]): P96 - P144 models
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.
- 322 -
Remedy
Replace the INV board.
Replace the INV board.
Replace the INV board.
Normal
Check that there is no liquid re-
frigerant in the compressor.
If there is none, replace the com-
pressor.
Replace the compressor.
Connect the short-circuit connec-
tor to CN6, and go to section [1].
Replace the INV board.
Replace the INV board.
Normal
*Reconnect the short-circuit con-
nector to CN6 after checking the
voltage.
GB
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