LG MULTI V M ARNU07GTU 4 Series Svc Manual page 65

Error
Error Type
No.
Inverter DC link high
281
voltage error
n Error Diagnosis and Countermeasure Flow Chart
Are there any power wire
connections normal?
Yes
Is input voltage normal?
Yes
Is Inv. PCB
normal?
Yes
Is Inv. PCB normal?
Yes
Recheck power and installation condition
* Measuring input voltage
Error Point
Inv PCB DC link voltage
supplied over 780V
1. Check R/S/T/N wiring conditions
No
2. Check Noise filter wiring conditions
→ Rewire them if abnormality found.
Check
R~S/S~T/T~R phase voltage is 380V 10%
No
R~N/S~N/T~N phase voltage is 220V 10%
→ Check connection condition and wiring if power is
abnormal
No
Replace Inv. PCB
No
Replace Inv. PCB
* Noise filter wiring
R S T
R S T
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Troubleshooting Guide
Main Reasons
1. Input voltage abnormal (R,S,T,N)
2. Inv. PCB damage
(DC Link voltage sensing part)
N
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