On Tuesday 04 August 2020 09:00:30 Matthew Herd wrote: > Yes, I figured as much, but I figure it’s a problem that should be > solved and the noise looks like a contributing factor. > > I am guessing that the source of the trouble is probably the VFD, as > 80kHz seems like a plausible base frequency for driving an AC motor. > Only the USC should be operating at a frequency higher than 60Hz other > than the VFD. The machine uses three gecko drives and large steppers, > so it’s not very sophisticated. I traced out the grounds briefly and > while they look fine, I did some dumb stuff. Like running a ground > wire from a 12V power supply to a terminal block, then back to the > ground connection, making no other connections at the terminal block — > no idea why I’d have done that. > If that terminal is isolated from the rest, and the connection is tight, it shouldn't have any effect. A shorter run straight to the bolt is better, but if the terminal is isolated, it is not Matts problem.
> > On Aug 4, 2020, at 8:48 AM, andy pugh <bodge...@gmail.com> wrote: > > > > But, random indexes shouldn't actually have the effect described. > > The index-enable only gets set once at the start of the cycle. It > > shouldn't matter what the Z-phase does from that point on. > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
