On Mon, 17 Oct 2011, Tom Easterday wrote: > Date: Mon, 17 Oct 2011 17:08:09 -0400 > From: Tom Easterday <tom-...@bgp.nu> > 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] config without encoders > > > On Oct 17, 2011, at 3:58 PM, Peter C. Wallace wrote: >> That simply looks untuned, have you varied FF1, added some P term etc etc > > I am having a really hard time finding any EMC PID values that make it > better then the graph I sent before. I can make it much worse by adding > even just a little P ie, p=1, p=1.1, p=1.01 - not to mention P=10 or higher.
Umm a little P is like .1, there no need to be close to 1 (which seems to be too much) around 1? > It looks a little smoother, rolling down to zero but starts off at tenths or > hundredths of inches before doing so. If I change FF1 to anything other > than 1, even 1.01, I get a much worse result (tenths of inches of ferror) FF1 may have to be changed in very small deltas from 1 (1.0001 for example) untill you dial it in > and sometimes immediate faults if it is much higher than 1. I've tried some > I term and even some D term (and combinations of both just for the fun of > it). I can't get anything that has lower following error than having > everything set to 0 and FF1=1. I dont think I or D make any sense. First adjust FF1 too much should make the postion lead, too little will make the position lag These numbers should be very small deviations from 1 (1.01 is probably way too big (like .9900 is probably way to small) Once FF1 is adjusted (it may end up being .994856, 1.000366 or something) start adding a little bit of P (start at .0001 then .001 the .01 etc) > > Tom > > > > > ------------------------------------------------------------------------------ > All the data continuously generated in your IT infrastructure contains a > definitive record of customers, application performance, security > threats, fraudulent activity and more. Splunk takes this data and makes > sense of it. Business sense. IT sense. Common sense. > http://p.sf.net/sfu/splunk-d2d-oct > _______________________________________________ > 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. ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity and more. Splunk takes this data and makes sense of it. Business sense. IT sense. Common sense. http://p.sf.net/sfu/splunk-d2d-oct _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
