On Friday 19 September 2014 22:37:16 Jon Elson did opine And Gene did reply: > On 09/19/2014 04:22 PM, Gene Heskett wrote: > > Hi have made a wee bit of progress with the spindle controls on the > > lathe, but lower speed performance is still sorely lacking. > > > > Current pid.s settings > > Pgain 125 > > Igain .05 > > FF0 100 > > FF1 20 > > > > maxoutput is set 1% below the pwmgen scale to keep it from hitting > > 100% duty cycle. > > When you get into it a little further, you may have to give > it as much at > 5% headroom. But, if you are now at a lower PWM frequency, > then it > needs less percentage, just to make sure it gets at least > something like > 1 us off time per cycle. > > > Since this is a parameter, I cannot put the gearchange > > > > bewteen the pid and the pwmgen because the pwmgens scale and the > > pid.maxoutput limits must be maintained. > > Maybe you could put gearchange BEFORE pwmgen?
Sensibly, that would appear to be the ideal place to put it, but with the 1% off cycle safety margin established by pid.s.maxoutput, I would lose the insurance of never driving it to 100% duty cycle. But a limit3 module after the gearchange could be used to re-establish that. Let the pid.s become unlimited and put the ceiling into the limit3.maxv. I'll check that out tomorrow. Thanks for making me think Jon. > > I had to change editors from gedit to geany because gedit was > > snatching 10 to 15 character snippets of the file and inserting then > > at several other places in the file, totally mucking with variable > > names and such. At about 1 in 20 saves I'd guess. > > NEVER seen anything like that. I would run memtest86 and > make sure > the CPU and memory are functioning properly. It has been run, for a day & a half, dead clean but not exactly recently. If geany ever does it, yup on the memtest86 session, instantly. So far, geany has not had any such hiccups. But I don't have to tell you what that faint thumping sound is. :) Cheers Jon, 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> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ Slashdot TV. Video for Nerds. Stuff that Matters. http://pubads.g.doubleclick.net/gampad/clk?id=160591471&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users