The DigiSpeed Step/Dir is not compatible with Mach3. It is for TurboCNC
The inputs to the DigiSpeed are filtered on board. The are no settings on the DigiSpeed that could be causing a fluctuation
I'm wondering if there is something with Mach3 that is causing it?
Have you done a Mach3 driver test to see if it is fluctuating?
Also do you have an oscilloscope to look at the PWM signal?
That would explain why I couldn't get the step/dir to work. I'll have to run the driver test. I've done it in the past and everything looked okay IIRC. I don't have an o-scope unfortunately.
I emailed you a few weeks ago about the Digispeed and how I can't get more then 7V back to my VFD. I still have that same issue and I wonder if it is somehow related to this issue. Maybe my Digispeed board is faulty?
I compensated for the lower voltage by programming the VFD Analog Input Gain. Which works but I'd really like to know why I can't get 10V out.