Mitsubishi PWFY-P36NMU-E-BU Service Handbook page 74

(2) Inverter output related troubles
I e t m s
[1] (1) Terminals on the
Check the
inverter board
INV board er-
Remove the inverter
ror detection
output cable from
circuit.
U, V, and W terminals.
(2) Operate the units.
[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) Remove the inverter
Check whether
output cable from U, V,
the inverter is
and W terminals.
damaged.
(No load)
(2) Turn SW5-1 on the
control board to ON.
(3) Operate the units.
Check the inverter
output voltage after the
inverter output frequency
has stabilized.
[4] Operate the units.
Check whether
Check the inverter
the inverter is
output voltage after the
damaged.
inverter output frequency
(During com-
has stabilized.
pressor opera-
tion)
o t b e c h e k c e d
1) Overcurrent error
(4250 Detail code No. 101, 102)
2) Converter-related errors
(4220 Detail code No. 01, 108,
109, 121)
3) ACCT sensor circuit failure
(5300 Detail code No.115)
4) I PM open
(5300 Detail code No. [-] None)
5) Power-supply-related problems occur.
Error code : 4115, 4102
Detail code : 01, [-] None
1) Compressor Meg failure
Error if less than 1 Mohm.
2) Compressor coil resistance failure
Coil resistance value of 1 ohm
(20˚C [68˚F]): BU, AU
1) Inverter-related problems are de-
tected.
2) Inverter voltage is not output at the
terminals
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
P h e n o m e n a
- 71 -
R e m e d y
Replace the INV board.
Replace the INV board.
Replace the INV board.
N ormal
Replace the INV board.
Check that there is no liquid re-
frigerant in the compressor.
If there is none, replace the com-
pressor.
Replace the compressor.
Turn SW5-1 to OFF, and see
item "1."
Replace the INV board.
Replace the INV board.
Normal
*Turn SW5-1 to OFF.
Replace the INV board.