Tom, I'm running a couple of stepgens via a 5i20 card on one machine and it is running much faster than what you are and I am not seeing overshoot problems.
I suspect your Max_accel below is lower than the accel values you have set in the INI file so you are telling the stepgen to go faster than what you have limited it to below. Try entering some large values below directly for max accel and max velocity and see if your problem doesn't go away. That way the stepgen will not attempt to limit the velocity of accel. Dave On 10/15/2011 1:12 AM, Tom Easterday wrote: > We are having some issues turning a servo motor with a Granite Devices drive > and in the process accidentally fried our homemade differential to single > ended conversion boards. We ordered some parts to repair them and in the > mean time I modified my hal config to ignore encoder feedback so we could > continue to test other issues. When we run above 2000ipm we have > significant following error and the motor overshoots it's mark by a decent > amount (say, an inch or so) and then comes back. Shouldn't EMC think that > commanded position and actual position are always in sync with the config > below or am I missing something? > > Could our Mesa cards be doing something wrong? > > > #******************* > # AXIS Y > #******************* > # Step Gen signals/setup > setp hm2_7i43.0.stepgen.01.dirsetup [AXIS_1]DIRSETUP > setp hm2_7i43.0.stepgen.01.dirhold [AXIS_1]DIRHOLD > setp hm2_7i43.0.stepgen.01.steplen [AXIS_1]STEPLEN > setp hm2_7i43.0.stepgen.01.stepspace [AXIS_1]STEPSPACE > setp hm2_7i43.0.stepgen.01.position-scale [AXIS_1]SCALE > setp hm2_7i43.0.stepgen.01.maxaccel [AXIS_1]MAX_ACCELERATION > setp hm2_7i43.0.stepgen.01.maxvel [AXIS_1]MAX_VELOCITY > setp hm2_7i43.0.stepgen.01.step_type 0 > setp hm2_7i43.0.stepgen.01.control-type 0 > > net ypos-fb axis.1.motor-pos-fb<= hm2_7i43.0.stepgen.01.position-fb > net ypos-cmd axis.1.motor-pos-cmd => hm2_7i43.0.stepgen.01.position-cmd > net yenable axis.1.amp-enable-out => hm2_7i43.0.stepgen.01.enable > > Thanks, > -Tom > > > ------------------------------------------------------------------------------ > All the data continuously generated in your IT infrastructure contains a > definitive record of customers, application performance, security > threats, fraudulent activity and more. Splunk takes this data and makes > sense of it. Business sense. IT sense. Common sense. > http://p.sf.net/sfu/splunk-d2d-oct > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity and more. Splunk takes this data and makes sense of it. Business sense. IT sense. Common sense. http://p.sf.net/sfu/splunk-d2d-oct _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
