On Thu, 7 Apr 2016, Gene Heskett wrote: > Date: Thu, 7 Apr 2016 13:21:35 -0400 > From: Gene Heskett <ghesk...@wdtv.com> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Servos and Drives PID Values > > On Thursday 07 April 2016 12:43:41 sam sokolik wrote: > >> I have tried the at_pid.. I have not had it work for me (create >> workable PID numbers) Even with velocity mode amps. >> >> sam > > Coming from you Sam, I am surprised. Which makes me want to see what it > can, or cannot, do for me, starting with my most difficult axis, Z, > which is both slow and quite heavy for a 16mmx5 screw to move up even > with a 1600 oz/in motor doing the screw twisting. But its a low > current, very high inductance motor, so the torque falloff is a huge > problem above 25 ipm. > > Do you recall how it failed at this late date? > > Thanks Sam. >
Unless this is a servo system, AT-PID is pretty useless. Tuning the stepper PID loop is trivial since its an almost perfect first order loop and can have values plugged in: FF1 = 1.00 P = 1/servo period FF2 = seconds from position read to velocity write (only if you need uinch following errors ) AT-PID might work on velocity mode servo drives if FF1 was set first (it certainly will just be a waste of time if FF1 is not set) > [...] > > 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) > 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 > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
