On Mon, Oct 11, 2010 at 3:33 PM, Chris Radek <[email protected]> wrote:
> > Stuart, long ago when we figured out how to set the scaling, you wrote > this: > > > On Wed, Sep 15, 2010 at 03:32:31PM -0500, Stuart Stevenson wrote: > > Hi, > > I checked the DAC output - it was .889 - I changed the scale from 8.89 > to > > .889 - the response was back to just like before. > > The config files to match this picture are available > > The latest picture is; > > http://www.mpm1.com:8080/machines/enshu/Screenshot-1.png > > > Unfortunately this picture is gone, but I remember it looking *really* > good and I commented on it. It was within a few encoder counts on a > rapid. What happened since then? It seems like you had a major > regression of some kind. > no regression http://www.mpm1.com:8080/machines/Screenshot1.png http://www.mpm1.com:8080/machines/Screenshot2.png http://www.mpm1.com:8080/machines/Screenshot3.png http://www.mpm1.com:8080/machines/Screenshot4.png The pictures show some of the progression during tuning. Number 4 is the final result. My questions have been trying to figure out why the traces have the spikes like they do. I set the max vel at 6.6666 to be just under 400 ipm and the scale at 6 to give 9 volts output and then tuned from there. This gives motion that looks and feels good but still has the spikes on the beginning of the accel and the beginning of the decel until I get close to the final tune and then it has the spikes on all four corners as shown. I don't have a serious problem with the machine is it moves I am just trying to figure out why this is. I should be able to tune it out. I still want a simple (dumb) amp and let EMC2 close the loop. I understand a Fanuc servo system is a fine system I just don't believe it is better than what EMC2 will do by itself, This old Fanuc is probably not as good as what EMC2 can do. I will shortly bypass the tach feedback on a servo system to take the servo drives tuning out of the equation. It will probably be the Cinci as the Enshu does not have tach feedback. We will see how that might work. A tach is set up at X volts/thousand rpm. EMC2 puts out Y volts/thousand rpm. I will need to set up two DACS per servo drive and scale between the two DACs. Hook one to the velocity input and one to the tach feedback input. This will cause the drive to read the motor speed as matching the requested speed at all times. This will keep the drive from calculating and adding any tuning to the output. This will allow EMC2 to close the loop. having some fun now thanks Stuart -- dos centavos ------------------------------------------------------------------------------ Beautiful is writing same markup. Internet Explorer 9 supports standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. Spend less time writing and rewriting code and more time creating great experiences on the web. Be a part of the beta today. http://p.sf.net/sfu/beautyoftheweb _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
