On Wed, 8 Jul 2009, Jon Elson wrote: > Date: Wed, 08 Jul 2009 21:22:22 -0500 > From: Jon Elson <el...@pico-systems.com> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] Servo tuning > > Leslie Newell wrote: >> Hi Jon, >> >> If I set the I term any lower than 500 it takes a LONG time to have any >> effect at all. Even with 500 it is taking several seconds to stabilise. >> >> > I'm beginning to suspect there has been a change in the way PID works, > either due to hostmot2 or > the version of EMC you and I are using. Do you use the normal PID > component (loadrt pid num_chan=4)? > Or, does hostmot2 use some different PID package? (I've been looking > into doing velocity estimates with a hardware+driver change, and it > would require a different PID, as it needs to get velocity from the > driver as opposed to calculating it by position delta each cycle).
The HostMot2 HAL file just uses the standard PID component, which is what makes the I term error so mysterious... > > Jon > > ------------------------------------------------------------------------------ > Enter the BlackBerry Developer Challenge > This is your chance to win up to $100,000 in prizes! For a limited time, > vendors submitting new applications to BlackBerry App World(TM) will have > the opportunity to enter the BlackBerry Developer Challenge. See full prize > details at: http://p.sf.net/sfu/Challenge > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
