Gene, Do you know which source code file has the G33.1 control? I'd like to look at how it's done. John
> -----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
