LG Multi-Inverter Service Manual page 88

Display
Title
code
Inverter DC link high
28
voltage error
I Error Diagnosis and Countermeasure Flow Chart
Is input voltage normal ?
Yes
Is Inverter PCB assembly
Power connection normal?
Yes
Is Inverter PCB Normal?
Recheck power and installation
condition
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Only for training and service purposes
Cause of error
Inv PCB DC link voltage
supplied over 420V
No
Check L~N Voltage is 220V±15%
No
Check connection from terminal block to
Inverter PCB assembly CN(L), CN(N)
No
Replace inverter PCB assembly
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4. Trouble Shooting
Check point & Normal condition
1. Input voltage abnormal (L~N)
2. ODU inverter PCB damage(DC Link voltage
sensing part)
LGE Internal Use Only