I didn’t want to hijack this post, but I’m seeing something similar:
My system (crossfire pro circa Jan 2021) had been working fine, then after a week or so of not using it I ran into an issue with 200ipm jogs on both X and Y and, more importantly, rapid moves between cuts. At 200ipm and above the stepper motor would just growl and not move the axis. I hadn’t updated software or firmware for a while (I was on 20.6) so I installed 21.1.5 to get the max rapid control (and subsequently updated the firmware), which has solved the issue of not moving between cuts after I adjusted to 100ipm max rapid. I checked the DC power supply voltage and got 36.1 with my Fluke 8025 DMM.
Once upon a time I worked in electronics repair, so I used a scope to check the AC ripple on the power supply (the most common failure mode way back when) and I got about 20 volts peak-to-peak of 60Hz with some of the switching supply frequency mixed in for flavor. Note I have the probe grounded to the power supply case for this measurement.
The case is not a good ground for that measurement. The PS has multiple terminals for + and -, add a short piece of wire to one of the - terminal posts and use that as your ground for noise measurements.
I finally got back to fiddling with my system. As usual, TomWS is right. I had forgotten that tidbit in the many years since I did electronics, using a negative for the ground the 60Hz disappeared, only about 20milivolts of noise total.
However I had ordered a new supply since they are fairly cheap, and I’ve got 300ipm rapid moves back since installing it. I don’t have any measurements to show why a new supply fixed it, but it does seem to have made a difference. The old supply was right at 36VDC as is the new one.
