LG ARUN Series Service Manual page 96

Troubleshooting Guide
Error
Error Type
No.
28*
Inverter DC link high
Master
voltage error
281
Slave
282
I Error Diagnosis and Countermeasure Flow Chart
Is input voltage normal?
Yes
Is inverter PCB assembly normal?
Yes
Recheck power and installation condition
* Measuring input voltage
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Only for training and service purposes
Error Point
Inv PCB DC link voltage
supplied over 780V
Check
R~S/S~T/T~R Phase voltage : 460V+10% (3Ø 460V)
No
¡ Check connection condition and wiring if power is
abnormal
No
Replace inverter PCB assembly
* Noise filter wiring
R
T S
Noise filter output(lower part)
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Main Reasons
1. Input voltage abnormal (R,S,T)
2. ODU inverter PCB damage
(DC Link voltage sensing part)
208/230V±10% (3Ø 208/230V)
T S
Noise filter input (upper part)
R
LGE Internal Use Only