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Ok, I see; so the "decision making" is happening at 3.1kHz, but actual motor-drive signal is chopped much finer than that? That makes some sense.

I admit the capacitor theory is entirely a shot...

They are 3.1kHz response frequency.

I have been thinking along the same lines; I don't see how they could dither faster than 3.1kHz as an absolute theoretical maximum. Since they are AC, maybe...

I have increased the error window to the point of significant slop before the servo tries to correct, and gains down so low the servo would be unusable. Neither had any effect on the 10.6khz noise....

Interesting; that is not something that it ever would have occurred to me could happen at such high frequencies. Pretty impressive, actually.

Appreciate the suggestion, Craig! I'll take a look...

Nope, I have not figured it out, and it is really damping my enthusiasm on otherwise very nice gear.

I did put a better quality line filter on the power line, and that helped dramatically with the...

I have a pair of Yaskawa SGD7S-1R6A00A002 drives, SGM7A-02A7A21 motors (Sigma 7 series, 200W). At the moment I am bench testing a new setup, checking control-board to drive setup. The problem I am...