On Tuesday 03 March 2020 22:22:25 Peter C. Wallace wrote: > On Tue, 3 Mar 2020, Jon Elson wrote: > > Date: Tue, 03 Mar 2020 20:54:55 -0600 > > From: Jon Elson <el...@pico-systems.com> > > Reply-To: EMC developers <emc-developers@lists.sourceforge.net> > > To: EMC developers <emc-developers@lists.sourceforge.net> > > Subject: Re: [Emc-developers] 2.7.15 PID Fix > > > > On 03/03/2020 10:54 AM, andy pugh wrote: > >> On Tue, 3 Mar 2020 at 16:50, Jon Elson <el...@pico-systems.com> wrote: > >>> Does anybody have a more specific case of how it is failing? > >> > >> https://forum.linuxcnc.org/38-general-linuxcnc-questions/38367-2-7- > >>15?start=0 > > > > So, the pid command-deriv was not used in the past? Geez, that > > could explain a LOT of issues with > > servo tuning before the change. > > > > I use feedback-deriv in my servo systems, would a non-functioning > > command-deriv make that not > > work right? > > > > Jon
> No, command-deriv is only used for the FF1 feedforward calculation Humm, Peter, none of my stuff uses that pid.n.command-deriv input now, but I have used FF1 in my stepper configs, so how about some examples of correct net useage statements to set that up right, once and for all? Thanks Peter. 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-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
