Hi folks,

I am new to CNC machine field and try to improve my self with continuous learning.. I need your expert advice on this issue.. Hoping I will get it...


I am try to repair Yaskawa Sevo driver with Model Number CPCR-MR01C.. In this OVER CURRENT Alarm error is generated...

I have tried following step to resolved this issue.

1) Remove control circuit from driver which uses 110V..
2) Now driver has only following part in it.
- 4 ET189 Power transistor
- 1 8200uf capacitor through Coil
- 220 V Power supply ony

As I am applying power supply 220 volt to driver (Without control card) in series my series lamp blow up and capacitor is heated very much.... So I am suspecting there is some issue with #2 setup.. Either ET189 transistor has some problem...

So it I connect control card with #2 sepup it shows me Over-Current error in it...

So anybody can help me on this issue... OR How I can check ET189 transistor..

Regards,
Pratik