LG ARUN Series, Service Manual

Page: 68 / 134

- 68 -
Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Checking Method for Key Components
2.5 Inverter IPM Checking Method
1. Wait until inverter PCB DC voltage is discharged after main power off.
2. Pull out CN-P1, CN-N1 connectors and U,V,W COMP connector connected with the inverter PCB.
3. Set multi tester to resistance mode.
4. If the value between P and N terminal of IPM is short(0
Ω
) or open(hundreds M
Ω
), PCB needs to be
replaced.(IPM damaged)
5. In the measured value with resistance mode should be within 28K
Ω
±10%.
6. In case measured value is different from the table, PCB needs to be replaced.(PCB damaged).
✽
Red(+) and black(-) are the measuring terminals of multi tester.
P terminal : black (-) N terminal : red (-)
U terminal : red(+) 28K
Ω
± 10% Open
V terminal : red(+) 28K
Ω
± 10% Open
W terminal : red(+) 28K
Ω
± 10% Open
P terminal : red(+) N terminal : red (+)
U terminal : black(-) Open 28K
Ω
± 10%
V terminal : black(-) Open 28K
Ω
± 10%
W terminal : black(-) Open 28K
Ω
± 10%
U terminal
V terminal
W terminal
P terminal
N terminal
CN-N1
CN-P1
3Ø 460V 3Ø
208/230V
U terminal
V terminal W terminal
U,V,W connector
N terminal
P terminal