LG ARUN Series Service Manual page 114

Troubleshooting Guide
Error
Error Type
No.
71*
Inverter input current CT
Master
711 sensor error
Slave
712
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
Micom input voltage isn't
within 2.5V ±0.3V at initial
state of power supply
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
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Main Reasons
1. Input voltage abnormal
2. ODU inverter PCB damage
(CT sensing part)
208/230V±10% (3Ø 208/230V)
LGE Internal Use Only