On Sunday 15 November 2020 12:45:46 Dave Cole wrote: > On 11/13/2020 1:24 AM, Gene Heskett wrote: > > On Thursday 12 November 2020 20:50:10 Dave Cole wrote: > >> Gene, > >> > >> Where did you buy that H bridge board ? Ebay ? > >> > >> Dave > > > > Yes, Thats a BTS7960 board. I tried it out tonight, ran the motor at > > about half speed for about half an hour. No detectable heating of > > the motor or the device. Running on a 350 watt 24 volt switcher. > > Found I needed to do some work on the hal file as I was only getting > > encoder B output back into the 5i25 encoder.01. Probably have an > > is_output being applied to one of the gpio's that is an input on the > > bob. But by then I was beat, so that is tomorrows troubleshooting > > job. For a full test I need to dummy up a hone switch for an index > > on the the motor since its not yet mounted on the BS-1. Need to > > figure out how to put one on it that is still out of the way and > > protected. Someplace behind the front disk I think, and detect a > > passing screw with an ATS-667 should work ok. Just have the find the > > giddy-up to do it. I'm finding that with a 30% pump, my giddy-up > > goes away too easy. That and make a couple saddles to put the motor > > in strong enough it won't get knocked coocoo by the choker straps I > > handle the BS-1 with as its about 200 lbs with the motor and 160mm 3 > > jaw mounted. > > > > Take care and stay well, Dave. > > Thanks Gene, > > I want to try out that H bridge. The price is certainly right! > > Dave > This one doesn't run pulse and dir, aka the default pwmgen mode 1, but mode 2 in the pwmgen. You'll have to set that in the main .hal file. It will likely need lots of Pgain in the pid settings because my motor needs about a 10% duration of pulse before it starts creeping along. YMMV, but that typical of brushed motors.
But I may have mucked the encoder, I get good looking, excellent quadrature signals to a 10x scope probe, but the instant I feed it into a BoB with opto inputs, the encoders output looks like its driving a 0.1uf capacitor. I've swapped Bobs, and I have 2 more ordered in case my spares are toasted. If that doesn't fix it, I'll have to buffer it in a 74HCT245. Take care Dave. 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
