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Hi dszp1976, I have similar machine and it is using the pulse to voltage card. I think it depends on the VFD drive. Some of them probably may accept PWM signal. Analog 0-10 is standard, but check...

I have CNC with this controller, but the spindle was not connected internally to the unit. I can confirm that the limit switches are NO contacts, but I guess you can change this inside the controller...