On Thursday 07 May 2020 22:39:13 John Dammeyer wrote: > Gene, > Do you know which source code file has the G33.1 control? I'd like to > look at how it's done. John > No, I haven't a clue John. Andy probably knows.
> > -----Original Message----- > > From: Gene Heskett [mailto:ghesk...@shentel.net] > > Sent: May-07-20 6:26 PM > > To: emc-users@lists.sourceforge.net > > Subject: Re: [Emc-users] Sourced from: Re: Fluctuating RPM using CUI > > ATM 10 encoder > > > > On Thursday 07 May 2020 20:53:50 Dan Henderson wrote: > > > I�m getting confused by the reply�s on this thread. Lol. > > > > > > Anyways, the tyco relay is rated at up to 28vdc switching voltage > > > so which equates to roughly 1450 rpm. I doubt I would be reversing > > > anywhere near that load level. I would expect the reverse would > > > occur at near zero rpm �assuming a G33.1 operates that way. I need > > > to research how that CAN cycle works within LinuxCNC? I definitely > > > do not want to perform any high speed reverse motion with this > > > circuit. > > > > g33.1 does a hard direction switch at the bottom of the hole. In the > > 2 machines I have with PMDC motors, I have had to insert some hal > > code to slow that to something the machinery can survive repeatedly. > > Basicly it slows the motor to a stop, detected by a timeout running > > out as the encoder stops, then the direction change is allowed on > > thru the the controller, and the speed is ramped back up in reverse. > > Ditto for the return to forward at the top. Sorta complex, but its > > all done in around 400 milliseconds per direction change on the > > GO704. Because the ideal waveform for that shaping is a > > sine-squared I am familiar with as an old analog tv engineer, and a > > limit3 module can do a reasonable version of that, I use that to > > both stop and restart the motor. Because Jons pwm-servo is a full 4 > > quadrant controller it pulls the energy out of the spinning motor, > > dumping it back into the motors psu as it stops the motor, which > > normally runs at 125 volts, pushing it up to about 165 volts for a > > few milliseconds but then dumps it back into the motor as it spins > > it back up in the other direction. No big power line surge despite > > the iron in the motor squeaking because Jon's servo amp has a 17 amp > > current limit programmed into it. > > > > > On Thu, May 7, 2020 at 7:41 PM James Isaac <whirl...@live.com> wrote: > > > > Thank you, Gene. > > > > > > > > Got it. > > > > Looks like I have to take the Python book from the top of the > > > > shelf, and put it lower. > > > > Firefox is my standard, so the lack of Internet Explorer is no > > > > hardship. Reading this Wiki puts my buying a VFD back by some > > > > reading time. > > > > Chuckle, you'll do it anyway :) > > > > Take care now, James Isaac. > > > > > > > James Isaac. > > > > [...] > > > > > > Huh? Just search for rockhopper and skip the penguin results. > > > > Damn, that has exploded into 5 million hits since the last time > > > > I did that, but "rockhopper for linuxcnc" gets that page as the > > > > first hit in our own wiki at: > > > > > > > > > > > > <http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Rockhopper_Web_Server> > > > > > > > > The are download from git, and install instructs at the bottom > > > > of that same page. Bookmark it recommended. > > > > 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
