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_TROUBLE SHOOTING GUIDE BOOK _
- 108 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Inverter PCB Assy. IGBT
Fault occur
Error
No.
Error Type Error Point Main Reasons
IPM self protection circuit
activation
(Overcurrent/IPM overheat-
ing/Vcc low voltage)
1.Over current detection at Inverter compres-
sor(U,V,W)
2.Compressor damaged (insulation dam-
aged/Motor damaged)
3.IPM overheating
(Heat sink disassembled)
4.Inverter compressor terminal disconnected
or loose
5.Inverter PCB assembly damaged
6.ODU input current low
n Error diagnosis and countermeasure flow chart
Are the resistance
Between each phase and
insulation resistance of Inverter
compressor normal?
No
Yes
Recheck power and installation condition
Yes
1. Check resistance between each terminal of compressor
2. Check insulation resistance between compressor
terminal and pipe (over 50M )
→ Replace compressor if abnormality found
Are there any power wire
connections normal?
No
Yes
1. Check R/S/T/N Wiring Condition
→ Rewire them if abnormality found
Is Inverter PCB assembly
normal?
No
Check Inverter PCB assembly IPM normality.
→ Replace Inverter PCB assembly
if abnormality found.
Is compressor
Wire connection
condition normal?
No
1.Check Inverter PCB assembly U,V,W connector
connection condition
2. Check wire disconnection and wiring
3. Check compressor terminal connection condition
(bad contact)
→ Reassemble if abnormality found
1.Check Inverter PCB assembly P,N connector
connection condition
2.Check wire disconnection and wiring
→ Reassemble if abnormality found
Yes
Yes
Is DC_Link Wire connection
condition normal?
No
1.Check Inverter PCB assembly Comp IPM heat sink
joining condition
→ Reassemble if abnormality found
Yes
Is Comp IPM heat sink’s
joining condition normal?
No
21*
Master
211
Slave1
212
Slave2
213
Slave3
214
Compressor JQC068MA* JQC048MA*
Temp. 25℃ 75℃ 25℃ 75℃
U-V
0.216 ± 7% Ω 0.258 ± 7% Ω 0.302 ± 7% Ω 0.360 ± 7% Ω
V-W
0.216 ± 7% Ω 0.258 ± 7% Ω 0.302 ± 7% Ω 0.360 ± 7% Ω
W-U
0.216 ± 7% Ω 0.258 ± 7% Ω 0.302 ± 7% Ω 0.360 ± 7% Ω
Error No. Error Type Error Point Main Reasons
21*
Inverter PCB Assy.
IPM Fault occur
IPM self protection
circuit activation
(Overcurrent/IPM over
-
heating/Vcc low voltage)
1. Over current detection at Inverter
compressor(U,V,W)
2. Compressor damaged (insulation
damaged/Motor damaged)
3. IPM overheating(Heat sink disas
-
sembled)
4. Inverter compressor terminal discon
-
nected or loose
5. Inverter PCB assembly damaged
6. ODU input current low
- 109 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
* Measuring resistance between
each terminal of compressor
• IPM(IGBT)
joining point
• Check joining
condition
R
S
T
• Check DC Link connector joining condition
* Compressor wire connector
connection point
Basic PartBasic PartBasic PartBasic Part
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