I'm wondering if it's actually the PWM input on the PSU that's the issue?
Interesting thought. Not impossible either. Or both?
Actually, I think it is a general problem when you go to digital controls with (say) only 8 bit resolution. The digital stuff has to dither to get an average of what you have specified. But we can see the dither, and it is not good.
Yeah, go analog. Since installing a PWM-to-DC convertor I have had zero problems. Runs smoothly.
One other point. If you try to slam the supply from 0 V to 200 V across a motor, the current surge will be incredible - and way beyond what the supply can deliver. Not mention that the surge might well destroy the magnets in the motor. Anyhow, this supply is smart: it detects the over-current VERY quickly and faults out: display E1. Just what I want - really.
But how to reset? Simple: switch the Enable input to Program and back. Actually, that input is NOT an 'enable' input at all, but a 'program' signal input.
Cheers
Roger