Troubleshooting Guide
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Only for training and service purposes
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n Error diagnosis and countermeasure flow chart
Error No. Error Type Error Point Main Reasons
71*
Master 711
Slave1 712
Slave2 713
Slave3 714
Converter CT Sensor
Error
Micom input voltage
isnʼt within 2.5V±0.3V
at initial state of power
supply
1. Input Voltage is abnormal (R-N)
2. ODU Converter PCB damage (CT sensing part)
Are there any power wire
Connections normal?
No
1. Check R/S/T/N wiring conditions
2. Check noise filer wiring conditions
Rewire them if abnormality found
Check
R~S/S~T/T~R phase voltage 380V±10%
R~N/S~N/T~N phase voltage 200V±10%
Check connection condition and wiring if power is abnormal
No
Is input voltage normal?
Yes
1. Replace Converter PCB
No
Is Converter PCB
Assembly normal?
Yes
Yes
Recheck Power and
Installation Condition
* Converter PCB assembly
* Measuring input voltage
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