Okuma Crown Alarm 1157 Motor over current

[dingo0722]

Our Okuma Crown turning center is throwing an alarm 1157, which says its a motor over current alarm. The machine was operating perfectly on Saturday and this morning it would not turn the spindle.

The alarm book says probable fault locations are the Inverter Unit or Faulty motor insulation.

Any help on this would be great

[Algirdas]

Okuma motors are really rigid. Check drive unit (inverter) power modules first.

[dingo0722]

The first thing I did was inspect the impedance of the motor to confirm there were not any shorts. Motor checked out fine. I spoke with Okuma and they said the only other thing it could be would be the motor driver. After the hurricane we had on Sunday, it appears a power surge smoked the driver. Its going to be a $6500 fix. I'm hopping insurance will cover it.