On Tue, 2 Feb 2016, Marius Alksnys wrote: > Date: Tue, 2 Feb 2016 20:40:21 +0200 > From: Marius Alksnys <marius.alks...@gmail.com> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: emc-users@lists.sourceforge.net > Subject: [Emc-users] 7i43 encoder count failures > > Today I catched the fault which was causing headache for quite a long > time already. > > There is a machine with one 7i43 P (200k) and one 7i39 and one BLDC > motor with encoder. I got reports about unexpected moves of the machine > while standing still. > > Today I saw: > count 712171 > rawcounts 780979 > > changing to: > 679403 > 748211 accordingly > > which is exactly 32768 or 0x8000 while motor is off and dead still. > > Together with that I saw huge number of errors (dmesg output): > hm2/hm2_7i43.0: Encoder 0: quadrature count errorhm2/hm2_7i43.0: Encoder > 0: quadrature count errorhm2/hm2_7i43.0: Encoder 0: quadrature count > errorhm2/hm2_7i43.0: Encoder 0: quadrature count errorhm2/hm2_7i43.0: > Encoder 0: quadrature count errorhm2/hm2_7i43.0: Encoder 0: quadrature > count errorhm2/hm2_7i43.0: Encoder 0: quadrature count > errorhm2/hm2_7i43.0: Encoder 0: quadrature count errorhm2/hm2_7i43.0: > Encoder 0: quadrature count error... > > I will code some more safety features to prevent dangerous > consequencies. I will try different ports - I can swap 50pin headers and > swap 7i39 channels. There are 4 of them in total. > > And this is replaced 7i43 board after first one I diagnosed as working > only when warmed and put on the shelf. It had issues with EPP > communications as far as I remember. The motherboard is the same. > > What might be there, anyway? >
Sounds like errors in the EPP connection. I would try shortening the EPP cable to the minimum length (If you are using a flat cable) or if you need a longer cable, use a IEEE-1284 compatible cable and a very short flat cable adapter to the 7I43s header. Might also be a marginal EPP port on the Motherboard. Peter Wallace Mesa Electronics ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
