hey peter I will check that now before I put the machine together again without the encoder config to make parts again
On Thu, May 21, 2020 at 3:05 PM Peter C. Wallace <p...@mesanet.com> wrote: > On Thu, 21 May 2020, andrew beck wrote: > > > Date: Thu, 21 May 2020 14:05:02 +1200 > > From: andrew beck <andrewbeck0...@gmail.com> > > Reply-To: "Enhanced Machine Controller (EMC)" > > <emc-users@lists.sourceforge.net> > > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net > > > > Subject: Re: [Emc-users] mesa 7i76 spindle encoder not counting suddenly > > > > hey peter > > > >I am using a 5i25 and 7i76 combo. and currently supplying power from the > >5i25 > > > >so I don't particularly want to make the computer ground the same as > >everything else lol. > > > > Except the the computer ground is frame ground and the common for the > servo > drive quadrature outputs should also be returned to frame ground > > >it sounds like I need to connect a external 5v powersupply up to the 7i76 > >and change the jumpers around to suit. and then connect up everything > >again. > > That will not change anything ground related > > > >I have a 7i89 coming soon and I will wait until then to sort this out I > >think. I will just disconnect the encoder feedback for now and make some > >parts. > > > >as my servo drives are tuned now. > > > > > > > >its a bit silly that it only just now failed though. it was working > >perfectly yesterday. > >regards > > > >Andrew > > Do you have valid differential signals across the A /A and B /B pairs? > > ( >2 V absolute across the pins, that is more positive than +2V or more > negative than -2V ) > > Thats would be the most diagnostic test > > > On Thu, May 21, 2020 at 1:46 PM Peter C. Wallace <p...@mesanet.com> wrote: > > > On Thu, 21 May 2020, andy pugh wrote: > > > > > Date: Thu, 21 May 2020 02:33:16 +0100 > > > From: andy pugh <bodge...@gmail.com> > > > Reply-To: "Enhanced Machine Controller (EMC)" > > > <emc-users@lists.sourceforge.net> > > > To: "Enhanced Machine Controller (EMC)" < > emc-users@lists.sourceforge.net > > > > > > Subject: Re: [Emc-users] mesa 7i76 spindle encoder not counting > suddenly > > > > > > On Thu, 21 May 2020 at 02:22, andrew beck <andrewbeck0...@gmail.com> > > wrote: > > > > >> I read a post you made while ago saying that the 5v and 24v > > powersupplies > > >> need to be within a certain threshold to work well. or else they need > > to > > >> be commoned together > > > > >This is really a question for PCW. I think that they need to be within > > >12 (17?) volts to work. > > > > There should be no substantial common mode voltage. That is the > > quadrature source and the 7I76E must have a common ground. > > > > The input common mode range on the 7I76E encoder input is -7 to +12V > > you can easily exceed this (and even damage the reciever chip) > > if the source and 7I76E do not have a common grouns > > > > > > >> so if I test between the 7i76 mesa 24 field power ground ( this is the > > same > > >> power as the servo drive control power) and the logic 0v on 7i76 I > > should > > >> get close to 0v is that correct? > > > > >The important thing is that the difference between + and - is a couple > > >of volts or so (positive or negative) and in both states the > > >difference between each input and 7i76 gnd is <12V (or possibly 17, > > >the number is in the manual) > > > > > > -- > > atp > > "A motorcycle is a bicycle with a pandemonium attachment and is > > designed for the especial use of mechanical geniuses, daredevils and > > lunatics." > > яяяя George Fitch, Atlanta Constitution Newspaper, 1912 > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > Peter Wallace > > Mesa Electronics > > > > (\__/) > > (='.'=) This is Bunny. Copy and paste bunny into your > > (")_(") signature to help him gain world domination. > > _______________________________________________ > > 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 > > Peter Wallace > Mesa Electronics > > (\__/) > (='.'=) This is Bunny. Copy and paste bunny into your > (")_(") signature to help him gain world domination. > _______________________________________________ > 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
