hey andy thanks for the quick reply. I am wired up with differential twisted pairs.
I have the 24v dc power supply powering all the general clean power needs on the machine. eg mesa 7i76 card and servo drives logic power. also powering the servo on pin on the servo drive connector. I am still using the same powersupply I have always used. also the 5i25 is connected powering the 7i76 spindle encoder power which I am using (I don't have a external 5v powersupply. I checked the voltages between the 24v io and the 5v from 5i25 and they are within 1.5volts what would be the thing to test next? regards Andrew On Thu, May 21, 2020 at 1:03 PM andy pugh <bodge...@gmail.com> wrote: > On Thu, 21 May 2020 at 01:47, andrew beck <andrewbeck0...@gmail.com> > wrote: > > > Now all it seems to do is change from 0 to 1 on the count and there is > not > > any sense to the numbers changing. it is not counting as it was before. > > This is what you see if one of the A or B channels has stopped > working. You can probably see this with halscope. > > What I suspect has happened is that you have added another DC source > to the mix with a different 0V reference, and that has exceeded the > common-mode limit of the encoder inputs (this only makes sense if your > encoder is wired as differential pairs. And jumpered accordingly) > > If your encoders are wired single-ended, then it's probably the same > root cause, and, in fact, it's easier to get this problem single-ended > (if you _can_ wire as different pairs, then you really should) > > If there are terms here that are unfamiliar I am happy to explain further. > > -- > atp > "A motorcycle is a bicycle with a pandemonium attachment and is > designed for the especial use of mechanical geniuses, daredevils and > lunatics." > — George Fitch, Atlanta Constitution Newspaper, 1912 > > > _______________________________________________ > 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
