On 1/28/2012 5:05 PM, Jon Elson wrote: > Viesturs Lācis wrote: >> 2012. gada 28. janvāris 18:14 noel<noel.ro...@comcast.net> rakstīja: >> >>> All interested in Servo Tuning. >>> >>> Have a look at: >>> http://support.motioneng.com/Downloads-Notes/Tuning/default.htm >>> >>> >> In the link from Noel I find that all three (well, the last maybe not >> that much) PID tuning methods: >> http://support.motioneng.com/Downloads-Notes/Tuning/3_pid_tune.htm >> >> Suggest starting with finding correct D parameter, as opposed to >> previously expressed opinions that P parameter is the one to start >> with. >> >> Can anyone with experience in servo tuning comment on this? >> >> >> Can anyone comment on this? >> > If your P is too high, no amount of D will stop the violent oscllation. > If your P is too low, there will be no movement at all, and D will > do nothing. > > I think you need to have P within a reasonable band for the particular > servo drive so that movement happens when it is commanded. > > Note that a lot of treatises on PID tuning use an oven and a > thermometer as the model. This is a one-quadrant system, > and not as relevant to a servo motion axis. > > Jon
Also, most of the descriptions of PID that I've seen involve what happens as process variables change due to outside influences (such as room temperature, or feedstock variations). We are concerned with the response to a setpoint change. Ken > > ------------------------------------------------------------------------------ > Try before you buy = See our experts in action! > The most comprehensive online learning library for Microsoft developers > is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, > Metro Style Apps, more. Free future releases when you subscribe now! > http://p.sf.net/sfu/learndevnow-dev2 > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
