On Saturday 01 August 2020 18:39:47 Matthew Herd wrote: > Thanks Chris, that was my thinking as well. I’ll try that tomorrow > and see what we find. I’m not sure there’s much more I could > disconnect in the ground department, but we’ll start looking at that > after we isolate the problem to encoder vs. USC board. > > > On Aug 1, 2020, at 5:35 PM, Chris Albertson > > <albertson.ch...@gmail.com> wrote: > > > > On Sat, Aug 1, 2020 at 11:40 AM Matthew Herd <herd.m...@gmail.com> wrote: > >> Thanks Gene, I hope you’re well also. I disconnected that > >> grounding wire, no difference observed in the > >> ppmc.0.encoder.03.index behavior. The noise seems the same both > >> when spindle is running and stopped, with a tendency strongly > >> toward "true" than "false." Pulses seem to be both long and short, > >> but I’d guess they’re about 80-90% true. Not at all what I’d > >> expect, even with noise. > > > > Should be easy to see now where the problem is. Disconnect the > > encoder cable and look at the actual wire with a real 'scope, not a > > software hal scope. Is the signal a clean quadrature when the > > spindle turns or noisy? If the signal is clean you know the problem > > is the interface card or a connector and if noisy the encoder itself > > is the problem > > I should mention the obvious, if the encoder is disconnected, that likely also removes its power supply, which most of them need to function correctly. My advice so far has assumed the encoder is good. But power it and check it with a real scope, all 3 outputs.
> > Chris Albertson > > Redondo Beach, California > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ > 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
