Friedrich MD24Y3J Svc Manual page 56

n AUUW24GD2 [MR24UY3J]
1. Wait until inverter PCB DC voltage is discharged after main power off.
2. Pull out V, V, W COMP connector.
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. Set the multi tester to diode mode.
6. In case measured value is different from the table, PCB needs to be replaced.(PCB damaged).
P W V U
27 26 25 24
Only for training and service purposes
Nw Nv Nu P
23 22 21
27
0.4 ~ 0.6 V
W V U Nw Nv Nu
26 25 24 23 22 21
- 56 -
0.4 ~ 0.6 V
PFC_IPM check
U, V, W ' R S T