On Wednesday 01 November 2017 20:14:07 andy pugh wrote: > On 1 November 2017 at 23:25, Eric H. Johnson <[email protected]> wrote: > > The problem is in the A axis. It seems to be > > losing encoder counts at very low speed, but not otherwise. It took > > a bit to track down because when I initially had it moving multiple > > rotations I could not get any errors running A by itself. Running > > with a feed rate in excess of 20000 (Degs per min), resulted in no > > errors. Slowing down to 10000 started to show a very small amount of > > error, and from 5000 on down the error was very pronounced. > > I think that this might be a floating GND or a half-disconnected > differential signal. > > My thinking is that at high pulse rates you get AC coupling and the > data gets through, but at low pulse rates the coupling breaks down.
Speaking as a CET, that is also my first assumption. 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) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
