On Oct 15, 2011, at 12:48 PM, Dave wrote: > 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. >
The values below just reference the ini. For max accel and max vel the ini values are: MAX_VELOCITY = 39 MAX_ACCELERATION = 120 Though we have also tried much lower values like 80 and 50 for acceleration. -Tom > 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 ------------------------------------------------------------------------------ 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
