On Friday 06 March 2020 18:59:12 Peter C. Wallace wrote: > On Fri, 6 Mar 2020, Gene Heskett wrote: > > Date: Fri, 6 Mar 2020 18:38:53 -0500 > > From: Gene Heskett <ghesk...@shentel.net> > > Reply-To: EMC developers <emc-developers@lists.sourceforge.net> > > To: emc-developers@lists.sourceforge.net > > Subject: [Emc-developers] nother Q for Peter C.W. > > > > I have now put 2 ATD667LSG's on this block and have failed to get a > > working index pulse into linuxcnc thru the encoder index pin of a > > 7i76D. > > > > I've mounted it branded face against a block of alu, with a green 3 > > pin socket to allow unplugging it quickly, and I jbwelded a piece of > > a nail to the side of the drawbar cap/bolt retainer at the top of > > the spindle, but I can't get a false out of it at any orientation of > > the nail or a tool waved past it. > > > > I've tried 2 new ones now, and they appear to be stuck high/true > > when the connector is made up, but goes false about 1 second after > > unplugging it. Attempting to measure the current gets a worst case > > of about 1.2 u-amps to ground, and that is not enough to pull it > > down to false unless the dvm is replaced by a short to ground and > > shows zilch current to the 5 volts. > > > > Trying to measure input current by inserting the dvm between its > > output and the encoder-index in looks like a small capacitor > > charging, but drops to zero current in nominally 1 second and stays > > there. > > > > W4-W5-W6 have been tried both ways, but to the left s/b ttl and > > everything except the ATS667 is ttl. Its supposed to be able to > > sink 25 ma up to 70 ma with a 12 volt supply, but its only getting > > 4.92 volts. > > > > 3 of them have been working on 5 volts on the lathe for going on 3 > > years. Worked fine till the goop went to hell because it dissolves > > in 0-W20 synthetic spindle oil. > > > > I'm bumfuzzled. Obviously I'm doing something wrong but what? > > > > 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-developers mailing list > > Emc-developers@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-developers > > You can test the 7I76D index input in TTL mode by simply shorting it > to ground. The encoder inputs have 2K pullups to 5V. You can read the > index pin status in hal, for a 5I25/6I25 and a 7I76 (encoder 0) that > pin would be: > > hm2_5i25.0.encoder.00.input-index which is where I am checking it. A short to ground on that wire=false. The nominally 5 volts on the red wire is a solid 4.91 volts like it was solid copper all the way. Probably coming from the Dells 5 volts from a psu thats drifting low with age.
> I would check the ATS667 5V and GND connections, sounds like something > is open That was my first thought too. But I can't find a finger to use as a divining rod. > Peter Wallace > Mesa Electronics > > > > _______________________________________________ > Emc-developers mailing list > Emc-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-developers 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-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
