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Troubleshooting
4-4 Case study for trouble shoots (cont.)
4-4-12 Case study – E461/361 & E464/364 & E466/366 (cont.)
Diagnosis 3 : Check Inverter PBA defect with Tester
1. Power Off.
2. Wait more than 15 minutes after the Power Off as in case of IPM failure, discharge mode may not work properly.
3. Remove all of the Inverter PBA connectors and wire that is fixed as screw. (Include wire that is fixed to compressor and DC Reactor.)
4. Prepare the digital multi tester.
Division
Measure
the resistance values
Measure the diode
voltage values
Samsung Electronics
Measured Point
+
-
P-IGBT
U
P-IGBT
V
P-IGBT
W
More than 500K
U
N-IGBT
V
N-IGBT
W
N-IGBT
U
P-IGBT
V
P-IGBT
W
P-IGBT
N-IGBT
U
N-IGBT
V
N-IGBT
W
Criterion
Measurement error can occur for reasons
such as the initial measurement
Measured over at least three times.
0.3~0.7V
Remark
condenser discharge.
158
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