On Thu, 2012-12-20 at 17:49 +0200, Viesturs Lācis wrote: > 2012/12/20 Andrew <[email protected]>: > > > > I don't understand why you limit MAX_OUTPUT to 0.5 or so. > > Usually MAX_OUTPUT 10 corresponds to max velocity of motor. > > Thus 0.5 is only 1/20 of max motor rpm! > > You limit it then PID gets saturated but the motor can't catch up the jog > > speed that you want. > > Just increase it > > I do not get, how does this work. With the some PID settings, I jog Z > axis motor back and forth and in HalScope I see that max value for > pid.2.output has been 0.27 or so. How comes that with _smaller_ > acceleration and velocity values and with the same PID settings I can > get saturated pid output? > PID should saturate to try to get you to the target if your accel is too low and you are not really following the planned traj to the endpoint.
Not even a SWAG but I think I'd try a higher P and FF1 = 1. You can also set your following errors tighter to control runaway if that should happen. As always stay handy to the E-stop and/or set you limit switches way off the real limits. Just as an aside do you have your current limit set high or low? Good luck and hang in there. Dave ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
