On Tuesday 05 May 2020 21:24:50 Dan Henderson wrote: > I just reverted to a LinuxCNC configuration that isn’t setup to use > the encoder. The spindle speed is much more consistent without the > feedback from the encoder?? > And I assume that its steady if the pid is bypassed. That does point a finger at the encoder. Can you post a link to it as I'm not familiar with that one.
> On Tue, May 5, 2020 at 8:19 PM Dan Henderson <luvtof...@gmail.com> wrote: > > I have LinuxCNC fully operational. In halscope I’m able to view the > > signals for both the spindle index, phase a, and I now have phase b > > hooked up. I’m conducting my testing with the LinuxCNC MDI. The > > number on the opto chips is EL817C807. > > The BOB PN is DB25-1205. useing the halscope, look at the a and b signals, you should see each with a 50% duty, and a time overlap in each state of 50%. + or - not more than 5% maximum, when its running steady. But you'll have to stop the hunting before you can read that very accurately. You won't see amplitude variations there unless something is poorly connected, only time variations. > > On Tue, May 5, 2020 at 8:08 PM Gene Heskett <ghesk...@shentel.net> wrote: > >> On Tuesday 05 May 2020 20:17:45 Dan Henderson wrote: > >> > Slowing things down had marginal effect. Okay sounds like I need > >> > to by pass the optocouplers. Would you recommend I bypass all the > >> > encoder inputs as well as the PWM output to the MC2100 > >> > controller? > >> > >> Only if it has opto's for isolation, they can effect to duration of > >> the pwm playing hob with the speed linearity. If the motor is > >> "hunting", something else is going on. The m2100 ISTR is the > >> controller that came in the treadmill and its a very serious case > >> of built by lowest bidder, I was not able to use it in anything > >> I've tried. Control was extremely non-linear until I put a 47k > >> resistor between linuxcnc and its summing point, That helped but > >> it was still flaky. Not to mention that all of its control > >> circuitry is on the hot side of the power line and quite dangerous. > >> > >> I am not a machinist, but a long retired broadcast engineer and a > >> CET so much of the high power stuff comes out of my junk box. The > >> psu for instance, makes about 120 volts DC at a surge current of > >> 20 amps, 10 forever, way more that the 1hp motor I'd put on the > >> back of a 7x12 lathe is rated for. Capable of getting 2hp out of > >> that 90 volt motor. But it kept breaking drive parts once I had > >> obtained one of the pico systems pwm-servo drivers. So I've gone > >> into the hal file and slowed the motors acceleration to something > >> that doesn't break stuff any more. But that might explain why my > >> troubleshooting is geared to the electronics, and possibly is > >> different than what a real machinist might do to solve an identical > >> problem. > >> > >> Other than that it doesn't sound as if the opto's speed is your > >> problem. > >> > >> So 2 other questions: > >> > >> What to you have in the way of meters and oscilloscopes for > >> troubleshooting? > >> > >> Do you actually have LinuxCNC running well enough to try to control > >> your motor? > >> > >> 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) > >> If we desire respect for the law, we must first make the law > >> respectable. - Louis D. Brandeis > >> 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 > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis 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
