On Fri, May 29, 2015 at 11:38:54PM -0400, John Kasunich wrote: > > Have you tried deadband equal to one or two counts of the scale?
I think adding deadband of one count will make it dither across two counts instead of one. The problem is when pid's output is zero, the position creeps. After a while there's an error of one count, pid corrects it, and then pid output goes back to zero and it starts again. Adding deadband just makes it not correct until you get more error. Dithering across one count is very very normal. I think you can slow or stop the dither simply by turning the offset knob on the amp. For velocity mode I recommend I=0 in your tuning. You are unlikely to permanently stop the dither because analog adjustments aren't very permanent, but you can make it slow enough it won't bother you. ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
