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Only for training and service purposes
LGE Internal Use Only
2.5 Inverter IPM/IGBT Checking Method
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).
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Red(+) and black(-) are the measuring terminals of multi tester.
P terminal : black (-)
N terminal : red (-)
U terminal : red(+)
2.3K Ω ± 10%(25℃)
3.0K Ω ± 10%(25℃)
V terminal : red(+)
2.3K Ω ± 10%(25℃)
3.0K Ω ± 10%(25℃)
W terminal : red(+)
2.3K Ω ± 10%(25℃)
3.0K Ω ± 10%(25℃)
P terminal : red(+)
N terminal : red (+)
U terminal : black(-)
3.0K Ω ± 10%(25℃)
2.3K Ω ± 10%(25℃)
V terminal : black(-)
3.0K Ω ± 10%(25℃)
2.3K Ω ± 10%(25℃)
W terminal : black(-)
3.0K Ω ± 10%(25℃)
2.3K Ω ± 10%(25℃)
P terminal
U terminal
N terminal
V terminal
W terminal
P terminal
W terminal
N terminal
V terminal
U terminal
Inverter PCB IPM(8, 18, 20 HP)
Inverter PCB IGBT(10~16 HP)
Checking Method for Key Components
Summary of Contents for ARNU05GL1G2
Page 138: ...P NO MFL67369002 April 2013 ...
