Hi everyone,

As the title says, I have an intermittent fault on a fanuc spindle motor. The spindle will just move of it's own accord, either at the start of the NC program or right at the end. and if it's too far away from the index position, it will throw up the above fault. If the position is not too far away, it will index ok when the NC tells it to.

We have a m/c maker on site, but he has no experience of this fault. Hence my question on here.

The m/c maker support thinks it is the motor at fault, but don't want to go that way without concrete info to say so. As the boss would do his nut if we replaced the motor and it turned out to be the amp.

Hope someone can help me out.

Regards,