Stuart Stevenson wrote: >> For the XY and Z axes we pigtailed the connector so EMC2 gets the same >> > signal the drive gets. At the same time and rate. > Wow, that is really weird! > For the spindle we used the encoder pulse out of the spindle drive as the > spindle motor feedback is two sine waves. > Friction sounds logical for the start of the accel but not for the start of > the decel. I get the same distortion in both places. Yeah, I saw it. actually, there are 4 disturbances, at the jerk inflection points. What acceleration do you have it set for? > If you notice the trace > is squared at the beginning of the accel and the beginning of the decel. > What trace is this, the error trace? Yes, I see it. it must mean that the drive is slow in acknowledging sudden changes in acceleration. Anyway, it is clear your tuning is far off, as the errors are huge even during the cruise portion. There is also a similar disturbance at the end of the accel, so all 4 jerk locations show this disturbance. > I would like to feed an EMC2 generated proportional pulse (psuedo encoder) > to the velocity feedback of the drive to see if that would not eliminate the > drives tuning and let EMC2 handle closing the loop. > Hmmm, I don't know how you'd do that. The PPMC board set doesn't have a quadrature output. I suppose you could use a USC board set for quadrature output.
Jon ------------------------------------------------------------------------------ Beautiful is writing same markup. Internet Explorer 9 supports standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. Spend less time writing and rewriting code and more time creating great experiences on the web. Be a part of the beta today. http://p.sf.net/sfu/beautyoftheweb _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
