Inverter Ipm Checking Method - LG MULTI V IV ARNU07GTU 2 Series Service Manual

2.5 Inverter IPM/IGBT Checking Method
Inverter PCB IPM(8, 18, 20 HP)
1. Wait until Comp PCB DC voltage is discharged after main power off.
2. Pull out DC_Link connector and U,V,W COMP connector connected with fan Comp 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 2.3K Ω ±10%(25℃).
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.
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Only for training and service purposes
P terminal
U terminal
V terminal
W terminal
N terminal
Inverter PCB IGBT(10~16 HP)
P terminal : black (-)
2.3K Ω ± 10%(25℃)
2.3K Ω ± 10%(25℃)
2.3K Ω ± 10%(25℃)
P terminal : red(+)
3.0K Ω ± 10%(25℃)
3.0K Ω ± 10%(25℃)
3.0K Ω ± 10%(25℃)
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Checking Method for Key Components
P terminal
U terminal
V terminal
W terminal
N terminal
N terminal : red (-)
3.0K Ω ± 10%(25℃)
3.0K Ω ± 10%(25℃)
3.0K Ω ± 10%(25℃)
N terminal : red (+)
2.3K Ω ± 10%(25℃)
2.3K Ω ± 10%(25℃)
2.3K Ω ± 10%(25℃)
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