On Wed, Sep 15, 2010 at 12:16:40PM -0500, Stuart Stevenson wrote: > Gentlemen, > > http://www.mpm1.com:8080/machines/enshu/Screenshot.png > This is set up with Pgain = 10, FF1 = 1 and scale = 8.89. > I have tried Pgain = 0 - got no PID output > Pgain = 100 - got a little better > Pgain = 300 - not much better but didn't feel as good > > The accel side looks much better but as I increase P I start to see sharp > points and flats on the curve. > I think I want to reach symmetry? How to do that? > thanks > Stuart >
It doesn't look at all right to me. Unless the machine was very sluggish originally, the accel you are getting here seems really low. Could you update the ini and hal files online? The ini still says OUTPUT_SCALE 1.0 - is that the one you changed to 8.89? In this screenshot the axis starts decelerating halfway through your 1" move, which is about when EMC thinks it's already at the endpoint. Something is still grossly wrong with dac/pid scaling/maxoutput or amp settings; you're not yet into the realm of where tweaks to tuning numbers will fix it. Can you put a voltmeter on the amp's velocity input and see if you're getting near 10v when you command a rapid? If you have it set the way I suggested, and all is working right, you should see about 9 volts. If it's 0.9 or some other number, you've got a smoking gun. I think it should be working a LOT better than this. ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing. http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
