LG ABNW85GB9A0 Svc Manual page 49

Part 4 Trouble Shooting
6.6 Troubleshooting Outdoor Error
CH 21 (DC Peak / Comp IGBTM Fault)
No. Checking Item
1 Is how long power on during
operation?
Does failure appears again
2
when starting operation?
Method to measure insulation
resistance
Comp.
Figure 1.
Method to measure coil
resistance
Comp.
U
V W
Figure 2.
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Only for training and service purposes
1) Power on for 12 hours or more
2) Power on for 12 hours or less
1) The compressor stops and same
error appears again.
2) If output voltage of the inverter is
stably output. Note 1)
pipe
Tester
Tester
3) If output voltage of the inverter is
unstable or it is 0V.
(When incapable of using a digi-
tal tester)
Symptom
- 49 -
Countermeasure
* Go to No.2.
* Go to No.2 after applying
power for designated time (12
hours).
* Check IGBTM may fail.
* Check coil resistor and insulation
resistor. If normal, restart the
unit. If same symptom occurs,
replace the compressor.
* Insulation resistor : 50MΩ or more
* Coil resistor (below table)
JBA068MAF
Temp 25°C 75°C
U-V 0.163 ± 7% Ω 0.195 ± 7% Ω
V-W 0.163 ± 7% Ω 0.195 ± 7% Ω
W-U 0.163 ± 7% Ω 0.195 ± 7% Ω
* Check the IGBTM.
If the IGBTM is normal, replace
the inverter board.
* Check coil resistor and insula-
tion resistor.
LGE Internal Use Only