Inverter Pba Ipm Overheating Error - Samsung AM072BXV Series Service Manual

Troubleshooting
4-3 Appropriate Measures for Different Symptom (cont.)
4-3-53 /
Outdoor unit
display
Judgment
- Inverter PBA IGBT/PFCM module temperature is more than 105℃
Method
- Heat sink and the IPM surface contact
assembly defective.
Cause of
- Refrigerant cooling heat sink and
problem
refrigerant piping assembly defective.
- Assembled bolt defective..
1. Cause of problem
Power Off
IPM (IGBT) module
pin 8, 9 : Is it normally both end resistance value?
(Refer to table1)
Is the bolt of the heat sink fully tightened?
Continue.
Samsung Electronics

Inverter PBA IPM overheating error

(INVERTER1 PBA)
(INVERTER2 PBA)
Yes
Yes
Table 1
Both end resistance values of IGBT module pin(8, 9 pin)
Measure the resistance after the power is turned off.
*Wait at least one minute after Power Off.
No
IGBT module pin 8, 9
No
Screwing Torque
M4 : 12~18kgf·cm
M5 : 20~30kgf·cm
: Do not use an electric screwdriver to avoid breakage of PBA in Control
Box. Please fasten with screwdriver.
Caution
: Apply the screw specification for each controller.
Screw M4
Screw M5
Temperature [°C] NTC [ohm]
10
20
30
40
50
60
70
80
Replace Inverter PBA.
: E500(Bottom), E400 (Top)
Tighten Bolt(Screw)
9000
6000
4000
3000
2000
1600
1200
750
Screw M5
144