On Sun, 30 Dec 2012, Viesturs L?cis wrote: > Date: Sun, 30 Dec 2012 20:27:51 +0200 > From: "[UTF-8] Viesturs L?cis" <viesturs.la...@gmail.com> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Pid saturated, was: Servo error > > 2012/12/30 Peter C. Wallace <p...@mesanet.com>: >> >> You may be in current limit above ~.4 so more voltage does not make a >> difference >> > > Yes, You are right, it did turn on the error led somewhere around 0.6. > Although I do not really understand that - I just retried n mode and > frequency/value combinations to get up to 3000 RPM. Gradually > increasing both of these pins allowed for value = 0.89, frequency = > 200 and error led did not turn on (and did not even try to). I tried > to add some resistance by grabbing the pinion, but the motor was > stronger.
This still indicates something is really wrong with commutation... > >> >> Can you try changing the lead angle? default is 90 degrees which should >> always be right but it does sound like theres a a lot of current going into >> the motor thats not generating torque which might indicate a problem here >> >> (change in ~10 degree steps around 90) >> > > Stepping down did decrease the speed, stepping up did improve it. > Currently I have ended up with lead-angle = 150, because with 160 it > was even faster in one direction, but refused to turn in opposite > direction, so this is last value, when motor turned in both directions > and was faster than any other value before that. > > Thank You, this has improved velocity, before drive reaches current > limit. Motor spins somewhere around 1470 RPM. I think I can live with > that - machine would move approximately at 7 m/min, which is not fast > for plasma table, but that will cover the thickness range they need to > cut (from 2 mm to 30 mm, vast majority between 10 - 20 mm thick) and > fortunately I do not have any commitments regarding max velocity. > > > Any ideas, why does pid output get saturated as soon as I try to jog > the motor? I just retried and it is still the same. Too high acceleration? > > -- > Viesturs > > If you can't fix it, you don't own it. > http://www.ifixit.com/Manifesto > > ------------------------------------------------------------------------------ > Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, > MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current > with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft > MVPs and experts. ON SALE this month only -- learn more at: > http://p.sf.net/sfu/learnmore_123012 > _______________________________________________ > 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. ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnmore_123012 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
