LG ARUN Series Service Manual page 106

Troubleshooting Guide
Error
Error Type
No.
50*
ODU 3phase power omis-
Master
sion error
501
Slave
502
I Error Diagnosis and Countermeasure Flow Chart
Is input voltage normal?
Yes
Is main PCB assembly normal?
Yes
Recheck power and installation condition
* Measuring input voltage
* Main PCB power connection
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Only for training and service purposes
Error Point
Omitting one or more of
R,S,T input power
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 Main PCB assembly
* Noise filter wiring
T S R
- 106 -
Main Reasons
1. Input Voltage abnormal (R,S,T)
2. Check power Line connection condition
3. Main PCB damage
208/230V±10% (3Ø 208/230V)
T R
S
LGE Internal Use Only