I'm trying to get spindle speed control with a VFD through my Galil card. See this related thread also. http://cnczone.com/forums/showthread.php?t=68589
Right now, I can control spindle speed with a 0 - 10 volt signal directly from a speed pot to the VFD. But when I connect to a Galil analog out, no joy. (Too little VFD impedance???) I've tried both MOCMDE and AN6.
For my next trial, I connected a voltmeter to both of the above points and cannot get a reading either. Surely, Galil can drive a voltmeter.
I'm looking for suggestions on what to investigate next.
Karl