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Spindle drive problems still.

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Still having repeated problems with the spindle drive on the lagunmatic 3516 w/yaskawa 626vm3

Here is the timeline of repairs

Rebuilt spindle moter 7/2012

Replaced encoder 8/2012

Rebuilt drive in 10/2012

Ran untill 12 2012

swaped a couple of boards power supplies then installed a buck booste transformer to get the voltage right on spec.

Ran for about two weeks.

The repair guys swaped me for a complete different drive.

Went down on day 30.

Rewired the machine and added a noise filter directly to the drive in case there was interference coming from something in the machine.

Ran it all last week 10-15 hours a day.

turned on today and drilled 12 holes went and had lunch and it is alarming out again.

When this fails it always fails when sitting. Usually when I am doing a setup or programming. It has never failed after running all day long.

It always seems that it will start up and run again a few days later. I will prove that out this time.

I believe this is an external cause but without a consistent problem how do you diagnose it?

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