Kasey Matejcek wrote: > It set to 1000 > setp ppmc.0.pwm.03.scale 1000 > > when you watch ppmc.0.pwm.03.value it changes from 1000 to -1000 and back > and forth it goes > when I set s 50 rpm then after some time ppmc.0.pwm.03.value goes to like 50 > after some time but it still surges up and down and so does the number > if left long enough ppmc.0.pwm.03.value goes to 0 or some really small > number when the rpm is set lower than 100rpm but really never get stable > above 100 rpm it just keeps surging up and down > OK, this is an unstable servo system. You need to adjust the PID values to damp out these surges. I have no experience with this particular application, closed-loop spindle speed. But, usually, lowering P and adding just a little D helps. In this case, you are using all FF0, so I don't have much feel for how that works. But, you could try adding a little D there, like start with 0.1 and multiply by 2 until it either gets good or starts getting worse. I suppose you could reduce FF2 and see if that helps, but that is working like a scale factor.
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