Checking The Inverter Insulated-Gate Bipolar Transistor; Checking Intelligent Power Module (Ipm) - LG Multi V5 Service Manual

Power Module (IPM)
1. Shut off main power. After main power is shut off, wait at least
ten (10) minutes until inverter compressor PCB DC voltage is
discharged.
WARNING
After switching off the main power supply and verifying that the DC volt-
age was discharged, wait for at least ten (10) minutes before checking
the electrical components in the control box. There is risk of electric
shock, physical injury or death.
2. Disconnect all IGBT / IPM connections.
3. Set the multi-tester to diode mode.
4. Measured value must be 0.2 ~ 0.6 V as shown in the table
below.
5. If the measured value is different than what is listed in the table
below, then set the multi-tester to resistance mode and measure
inverter PCB is damaged and needs to be replaced.
Table 65: Checking the Inverter IGBT / IPM.
U Terminal : Red (+)
V Terminal : Red (+)
W Terminal : Red (+)
U Terminal : Black (-)
V Terminal : Black (-)
W Terminal : Black (-)
120
P Terminal: Black (-)
P Terminal: Red (+)
Due to our policy of continuous product innovation, some specifications may change without notification.
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Figure 57:
P
N
Figure 58: Location of IGBT / IPM Terminals (Appearances Will Vary
Depending on Model).
0.2 ~ 0.6 V
0.2 ~ 0.6 V
0.2 ~ 0.6 V
-
-
-
U
V
W
W
V
U
N
P
N Terminal: Red (-)
-
-
-
N Terminal: Red (+)
0.2 ~ 0.6 V
0.2 ~ 0.6 V
0.2 ~ 0.6 V