I have a Yaskawa AC, (brushless DC motor), servo drive. The bearings failed after years of service. The the drive was disassembled, bearings replaced, and the drive put back together. This includes pressing the encoder back onto the shaft.
Sweet! Everything looks great and feels nice.
Power it up and... The shaft turns about one revolution and shuts down. Does this everytime. We stick an identical motor/encoder unit on and it runs fine.
I'm getting a feeling that some sort of alighnment is required between the encoder and the motor position so the motor controller knows how to sequence the power to the motor. However no indexing marks were ever noted or made, and there seems to be no easy way to adjust the alighment. Everything gets pressed on and off the shaft.
Does this alignment issue ring true to you?
Any bench top suggestions or proceedure you know of?