On Saturday 22 December 2012 15:55:46 Peter C. Wallace did opine: > On Sat, 22 Dec 2012, Stephen Dubovsky wrote: > > Date: Sat, 22 Dec 2012 14:27:39 -0500 > > From: Stephen Dubovsky <smdubov...@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 > > > > Sorry Peter, I have respect for you (great products!) but I > > *COMPLETELY* disagree w/ this. I have my masters degree in power > > electronics and control and have lots of experience in on and off > > road traction drives (aka electric vehicles.) > > Sorry, its very clear from you dont understan tuning a voltage mode > drive This is obvious when you say D is not important. D is critically > important in a pure voltage mode drive like an HBridge. > > Peter wallace > Peter; Which mode would you call a pwmgen->fast C41>->10kresistor>->center pot arm connection to the 250 watt controller in a mini-lathe?
This is the configuration, with the 10k resistor between the (cnc4pc) C41 output and the pot arm terminal of the controller in the mini-lathe. It is now linear enough that a bit of multiplied enc.velocity seems to arrive at both fairly stable control, and within 5% of the correct speeds as set by an sxxx command from the mdi entry box. Only the very low speeds, <120 rpm, seem to need some tweaking yet. The control seems load stiff, but if I use any Igain, the settling time to final speed at "s60" rpm, can be minutes as it starts very slowly & gradually, very gradually ramps up to about the right speed of 1 rps. But, I am still trying to grok this beast well enough to know which knob to tweak to fine tune what, hence the questions. Thanks Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! The PINK SOCKS were ORIGINALLY from 1952!! But they went to MARS around 1953!! I was taught to respect my elders, but its getting harder and harder to find any... ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users