That wasn't the problem. When I was tuning my servos they were pretty stiff and responsive, but still making a lot of noise. I tried to tweak the PID parameters, but every now and then I would change something that caused the servos to oscillate wildly out of control. When this happened, rather than using the MDI to generate a signal, enabling / disabling the machine is all I could do.
I think I was assuming that getting the servo into a stage of poor PID tuning was normal. > -----Original Message----- > From: Jon Elson [mailto:el...@pico-systems.com] > Sent: Monday, 10 August 2009 4:39 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Servo tuning--plot request > > > > Frank Tkalcevic wrote: > > > >> How do you generate your step pulses? When I was tunning, I would > >> keep the machine on and do an MDI move. This doesn't work > too well > >> when the tuning is so bad it faults when you enable the machine. > >> > >> > Hmm, looks like I missed part of your question. If it is > faulting immediately, there may be a reversal of the motor > wires, or some other reason the servo diverges, when it is > supposed to converge. I show that sort of response in one of > the pictures on my tutorial. If you turn the gain down, then > you may be able to keep it from going wild immediately. > I have software-controlled following error in EMC, not in the > drive, so I can set it quite wide when starting out. > > Jon > > -------------------------------------------------------------- > ---------------- > Let Crystal Reports handle the reporting - Free Crystal > Reports 2008 30-Day trial. Simplify your report design, > integration and deployment - and focus on what you do best, > core application coding. Discover what's new with Crystal > Reports now. http://p.sf.net/sfu/bobj-july > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
