On Sun, 15 Nov 2009, Pat Lyons wrote: > Date: Sun, 15 Nov 2009 10:32:06 -0500 > From: Pat Lyons <[email protected]> > Reply-To: "Enhanced Machine Controller (EMC)" > <[email protected]> > To: "Enhanced Machine Controller (EMC)" <[email protected]> > Subject: [Emc-users] 5i20+7i33 connection to Servo Drive has +21mV of drift. > > Hello again, > > first off thank to all the suggestions about the encoders I was asking > about. I think I'm just gonna go with the requirement of zero'ing position > prior to milling any part. > > My new question has to do with the servo drive's input. When it should be > at 0v, the input to the drive sits at about 21mV, which causes the motor to > drift slowly, I though this might just mean the "balance" pot needs to be > adjusted, but turning it all the way in either direction has no effect.
It should have an effect, hope you are not tweaking the wrong pot... > > it's been a while since I've dealt with anything on this level, but I was > wondering to myself could this be an impedance mismatch issue? maybe I > should try a pullup or pulldown resistor? I read in the manual something > about the 7i33 already having one or the other, I'll be lookin into that > again today, I just wanted to see if anyone had any immediate suggestions or > had encountered this before. > > Thanks again!!! > > -pat You can use the PID components BIAS input to zero the analog outputs, but you should not be drifting if the loop is closed. The drives normally should not be enabled until the loop is closed. > ------------------------------------------------------------------------------ > 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 > [email protected] > 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. ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
