Samsung Electronics 242
Troubleshooting
4-4-13 Case study – Poor cooling caused by IPM overheated
- Problem : Poor cooling
- Condition : Compressor frequency doesn’t increase, IPM temperature is too high, Low pressure is high
- History
: 13.05.07 Trial operation
: 13.05.27 Inverter PBA, EMI PBA, Reactor replacement
: 13.05.27 IPM temperature ↑ → comp Hz ↓→cooling capacity↓
- Root cause : Bad contact of IPM cause by faulty bolt.
Test 5/27
5/28
case 1 case 2 case 3
upper PBA change lower PBA change
exchange PBA position
each other
Upper PBA
(inv 2)
PBA_A
freq. 55hz
IPM 89
℃
PBA C
freq. 54hz
IPM 82℃
PBA C
freq. 55hz
IPM 79
℃
PBA D
freq. 55hz
IPM 81
℃
Lower PBA
(inv 1)
PBA B
freq. 52hz
IPM 86
℃
PBA B
freq.51hz
IPM 92
℃
CB D
freq. 52hz
IPM 91
℃
PBA C
freq. 52hz
IPM 89
℃
Bad
Bad
IPM1
IPM
Heat sink
IPM2
There is no thermal grease.
IPM 2- Reattach
4-4 Case study for trouble shoots (cont.)
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