I replaced the servo/encoder yesterday night and the result is the same. So what do i have left to try? I'll test if the tuning software creates the same behaviour (different computer, different OS...) and I'll try Toms suggestion to add a filtering capacitor on the step signal. I also found an old spec sheet for the servo's. I'm surprised it says that the servo's are really good for plotters. To me plotter motors are small and these are compact but not _that_ small. I have the J03M-series motors, rated at 65 V and 10 A according to the label on the servo. The specification says 54.2 oz-in rated torque and 266 peak (0.4 resp 1.9 Nm). Could it be that they are too small? I think that's not the case and even if I run my test with low speeds around 200 mm/min the offset appears. http://www.yaskawa.com/site/DMServo.nsf/(DocID)/TKUR-5ELJ3U/$File/TSE-C249-13B.pdf
I'm running out of options soon... :( 2009/9/26 Sven Wesley <svenne.d...@gmail.com> > > > 2009/9/26 Sven Wesley <svenne.d...@gmail.com> > >> >> I've tried all kinds of setups with the step timing, but I'll try to >> increase the Direction time to see if it changes. >> The only thing I really haven't tested is another encoder/servo, I'll try >> that like I wrote earlier. And see if the tuning app makes the same error. >> >> I got an answer from Tom at Rutex USA and he says that 2us would be fine >> for the step time. I might change drivers to see if there's a difference. >> >> >> --S >> >> > Forgot to write, Tom mentioned that he had seen noise on the step signal > interpreted as a new step and it could be solved with a small capacitor > between the step input and ground. > I run the test software on an old laptop with a parallel port, that's also > a reason to see if the error appears when tuning. Then the servo's are > really pushed hard so the offset should be seen. > ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
