All,

I am nearing the completion of my CNC build and am wiring up the servo motors/drivers. I have three embeddedtronics UHU servo boards and the AutomationTechnoloigesInc KL23-130-60 servo motors.

All seems well with the boards at 24V using a standard switching supply. When I change to a 48V switcher, there is next to no torque (moving the motor by hand causes an error), the UHU chip seems to become corrupt (polling the setpoints shows silly numbers, large negative values for instance). The error led lights instantly. Confusingly, I can run the motors at very slow speeds (<60rpm). Above this they fault.

I don't seem to have blown anything because hey will happily run on 24V again with lots of torque and speeds up to ~1500rpm (consistent with that voltage level). Attaching the motors directly to the 48V power supply causes them to run at max speed as expected.

Not sure what is going on but any help would be much appreciated. I *could* run these at 24V but would rather have the option of a bit more speed to be able to gear them down for a bit more torque.

Andrew