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« on: June 20, 2021, 01:39:45 AM »
I am finishing up the transition from Mach3 to Mach4 with a PMDX and ESS upgrade. The last step before I can button things up is the Spindle PWM. With a potentiometer hooked up to the VFD 10v+, ACM and AVI, I can control the spindle speed. My original setup only had two wires going to the VFD (AVI and ACM). I connected the PMDX like the previous card to AVI and ACM with a 5v max.
Should I be able to run the CFD with just two signals?
No matter what I do, I don't think the power is getting ti the VFD because the two cards don't share the right ground. A voltmeter shows power at the terminals, so maybe. The VFD and PMDX are both grounded to the machine. The control signals are coming from the PMDX on a terminal block that has pc GND which is different from the shared ground mentioned previously.
Does the PMDX need to share a pc gnd with the VFD?
If you have this setup or could shed some light it would be much appreciated!