LG Multi-Inverter Service Manual page 111

4. Trouble Shooting
Display
Title
code
DC Link Low voltage
23
I Error Diagnosis and Countermeasure Flow Chart
Is DC Link voltage
under 380V ?
Yes
Is input voltage normal ?
Yes
Is Inverter PCB assembly
Power connection normal?
Yes
Is Inverter PCB Normal?
Yes
Recheck power and installation condition
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Cause of error
• DC Link volt is below
300V
Check the DC link Voltage AD Input of Inverter PCB
No
If AD Input is strange, change the Inverter PCB
(refer the next page.)
R~S/S~T/T~R phase voltage is 400V ±10%
R~N/S~N/T~N phase voltage is 220V ±10%
No
¡ Check connection condition and wiring if power is
abnormal.
Check connection from terminal block to
No
Inverter PCB assembly CN_L1(R), CN_L2(S), CN_L3(T)
No
Replace inverter PCB assembly
- 110 -
Check point & Normal condition
• Check point & Normal condition
• Check the TAB1 is connect.
• At not operating : DC Link voltage(260V¡è )
• At Comp operating : DC Link voltage(500V¡è )
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