... > > > > I would also think there is some issue with ground (broken wire?) or > > with configuration (assuming hardware is OK of course) -- I got the > > same VFD in my Biesses, and although they seem a bit noisy > > (touchscreens nearby doen't work as soon as spindle starts despite > > shielded motor cables and proper grounding), vfd and motor work ok. > > analog signals are coming from 7i48, connected to pins 4 and 5. > > start/stop signals etc... is driven by original wiring and relay break > > out boards. > > > > Thank you Gene and others for the tips! I did fix it but am not sure > what was the cause - with wires removed from VFD the analog output was > stable. Connecting cables to VFD and it was fluctuating. In the end it > was stable if I removed the wires from VFD to 7i37 board that provide > "run" and "stop" signals for VFD. I just introduced 2 relays inbetween > and now it kinda works.
A VFD is usually a very good noise generator so should come as no surprise. > Robert I was hoping that your experience might help on this as I am > getting something that I have not seen before - with pwmgen value = 0 > there are 0.3V on the actual analog output (that is approximately 1/30 > of the full range so should give about 10Hz on VFD output as I have > 0-300Hz range specified in Pr0 and Pr1) but the VFD runs the motor at > much higher speed - the frequency matches Prc parameter in VFD. Voltage drop on ground signal? ... Nicklas Karlsson _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
