I have a BP Discovery 308 with a Simodrive 611. If I give a speed higher than 2500 rpm on the spindle the drive faults out. I can step up to 6k with no problem. Also when I run the machine for more than a few hours the drive will fault out when rapiding the Z back to home position. Some have suggested the caps in the drive power section need to be changed. Googling I find a gaggle of places that fix Siemens drives. Has anyone had some experience with any of the drive repair places? Or can you recommend a place to send the drive to?

I'm in the midwest USA.

Thanks
John