On 12/21/2015 12:59 AM, John Thornton wrote: > An update, I made a star grounding configuration so EVERY ground comes > from the same place. I tested with the VFD unplugged and all is fine, > plug the VFD in and same problem sserial errors. The VFD is 220v so to > use one power source I'd have to run new wire from the panel to the 220v > outlet and get a 4 wire plug. Not impossible but a PIA to work up in the > attic....
If you have a dual supply and a transformer for AC 110V -> 220V (or the other way around), then you may need to reverse the polarity of phase and neutral of the transformer. You may see common-mode injection because the phase-polarity of the two supplies are 180 degrees out of sync. The chassis will then be conducting the capacitively coupled common-mode, which may interfere a lot. -- Greetings Bertho (disclaimers are disclaimed) ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
