LG MULTI V 5 Manual Book page 47

Error
Error Type Error Point
No.
Error No. Error Type Error Point
21*
Master
IPM self protection
211
IPM self protection circuit
Inverter PCB Assy. circuit activation
activation
Slave1
21* Inverter PCB Assy. IGBT
IPM Fault occur (Overcurrent/IPM over-
212
Fault occur
(Overcurrent/IPM overheat-
heating/Vcc low voltage)
ing/Vcc low voltage)
Slave2
213
Slave3
214
n Error diagnosis and countermeasure flow chart
Are there any power wire
No
connections normal?
Yes
Are the resistance
No
Between each phase and
insulation resistance of Inverter
compressor normal?
Yes
Is compressor
No
Wire connection
condition normal?
Yes
No
Is DC_Link Wire connection
condition normal?
Yes
No
Is Comp IPM heat sink's
joining condition normal?
Yes
No
Is Inverter PCB assembly
normal?
Yes
Recheck power and installation condition
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
092
_TROUBLE SHOOTING GUIDE BOOK
Main Reasons
Main Reasons
1. Over current detection at Inverter
1.Over current detection at Inverter compres-
compressor(U,V,W)
sor(U,V,W)
2. Compressor damaged (insulation
2.Compressor damaged (insulation dam-
damaged/Motor damaged)
aged/Motor damaged)
3. IPM overheating(Heat sink disas-
3.IPM overheating
sembled)
(Heat sink disassembled)
4. Inverter compressor terminal discon-
4.Inverter compressor terminal disconnected
nected or loose
or loose
5. Inverter PCB assembly damaged
5.Inverter PCB assembly damaged
6. ODU input current low
6.ODU input current low
1. Check R/S/T/N Wiring Condition
→ Rewire them if abnormality found
1. Check resistance between each terminal of compressor
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
2. Check insulation resistance between compressor
terminal and pipe (over 50M )
→ Replace compressor if abnormality found
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
1.Check Inverter PCB assembly Comp IPM heat sink
joining condition
→ Reassemble if abnormality found
Check Inverter PCB assembly IPM normality.
→ Replace Inverter PCB assembly
if abnormality found.
- 108 -
LGE Internal Use Only
* Measuring resistance between
each terminal of compressor
* Compressor wire connector
• IPM(IGBT)
joining point
• Check joining
• Check DC Link connector joining condition
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
connection point
R
S
T
condition
- 109 -
LGE Internal Use Only
093
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