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Troubleshooting
4-4 Case study for trouble shoots (cont.)
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
Test
Upper PBA
(inv 2)
Lower PBA
(inv 1)
- Root cause : Bad contact of IPM cause by faulty bolt.
IPM1
IPM
Heat sink
Samsung Electronics
comp Hz
cooling capacity
5/27
upper PBA change
PBA_A
freq. 55hz
freq. 54hz
IPM 89
IPM 82
PBA B
freq. 52hz
IPM 86
case 1
lower PBA change
PBA C
freq. 55hz
IPM 79
PBA B
freq.51hz
freq. 52hz
IPM 92
IPM 91
IPM2
There is no thermal grease.
5/28
case 2
case 3
exchange PBA position
each other
PBA C
PBA D
freq. 55hz
IPM 81
CB D
PBA C
freq. 52hz
IPM 89
IPM 2- Reattach
160
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