Inverter Ipm Checking Method - LG ARUN Series Service Manual

Checking Method for Key Components

2.5 Inverter IPM Checking Method

CN-P1
CN-N1
N terminal
P terminal
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(0Ω) or open(hundreds MΩ), 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).
U terminal : red(+)
V terminal : red(+)
W terminal : red(+)
U terminal : black(-)
V terminal : black(-)
W terminal : black(-)
✽ Red(+) and black(-) are the measuring terminals of multi tester.
Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3Ø 460V
W terminal
U terminal
V terminal
P terminal : black (-)
28K Ω ± 10%
28K Ω ± 10%
28K Ω ± 10%
P terminal : red(+)
Open
Open
Open
N terminal
P terminal
U,V,W connector
N terminal : red (-)
Open
Open
Open
N terminal : red (+)
28K Ω ± 10%
28K Ω ± 10%
28K Ω ± 10%
- 68 -
3Ø 208/230V
U terminal
V terminal W terminal
LGE Internal Use Only