LG MULTI V M ARNU07GTU 4 Series Svc Manual page 59

Error
Error Type
No.
211
Inv. PCB IPM Fault occur
n Error diagnosis and countermeasure flow chart
Are there any power wire
connections normal?
Yes
Are the resistance
Between each phase and
insulation resistance of Inverter
compressor normal?
Yes
Is compressor
Wire connection
condition normal?
Yes
Is DC_Link Wire connection
condition normal?
Yes
Is Comp IPM heat sink's
joining condition normal?
Yes
Is Inv. PCB
normal?
Yes
Recheck power and installation condition
Error Point
IPM self protection circuit
activation
(Overcurrent/IPM
overheating/Vcc low
voltage)
No 1. Check R/S/T/N Wiring Condition
→ Rewire them if abnormality found
1. Check resistance between each terminal of
compressor.(Refer to the right side tables.)
2. Check insulation resistance between
No
compressor terminal and pipe (over 50m)
→ Replace compressor if abnormality found
1. Check Inv. PCB U,V,W connector
connection condition
No
2. Check wire disconnection and wiring
3. Check compressor terminal connection
condition(bad contact)
→ Reassemble if abnormality found
1.Check Inv. PCB P,N connector
connection condition
No
2. Check wire disconnection and wiring
→ Reassemble if abnormality found
1.Check Inv. PCB IPM heat sink
No
joining condition
→ Reassemble if abnormality found
Check Inv. PCB IPM normality.
No
→ Replace Comp PCB assembly
if abnormality found.
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Troubleshooting Guide
Main Reasons
1.Over current detection at Inverter
compressor(U,V,W)
2.Compressor damaged (insulation
damaged/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
RJA036MAA
Temp
U-V 0.529 ± 7% Ohms 0.631 ± 7% Ohms
V-W 0.529 ± 7% Ohms 0.631 ± 7% Ohms
W-U 0.529 ± 7% Ohms 0.631 ± 7% Ohms
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