On Tuesday 01 December 2020 10:49:41 Gene Heskett wrote: > On Tuesday 01 December 2020 03:36:14 Gene Heskett wrote: > > Has anyone setup the at_pid to autotune at lcnc startup? > > > > If so, some good starting value suggestions would be appreciated as > > I've not a clue as to good values to use. I think one could use a > > pyvcp led to indicate the autotune is done and ready for use. > > > > It seems to me that it could be used to compensate for the weight of > > the 160mm chuck, or lack of it, or the weight of the workpiece > > mounted. Right now, its suffering hugely from windup, taking a > > minute or more to sort of settle after I take my finger from one of > > the [] keys. But I have not a clue what the scale may be, as I don't > > actually have the motor driving the bs-1 yet, nor do I have a home > > switch on it yet so I can measure the scale. > > > > Waiting on hardened 6mm redi-thread to mount the motor with. And a > > better motor and vfd for the 6040 I'm making parts with. redi-thread > > shoulda been here Friday. the bag of nuts from the same place came > > Friday. Sigh.... > > > > Cheers, Gene Heskett > > Commented out that and index-enable and its running. Had 1.5" of snow > at 7AM, and I now have 3" of snow at 10:45 local. > > Cheers, Gene Heskett
And so far its made 1 move in one direction, set stuff to crazy values and stopped, and has not made an effort to move to move the axis since despite restarting from scratch a couple times. But, in going back to the normal pid, I start to get the desired results until the motor inertia causes a decel overshoot, which reverses the motor at pretty decent rpms, killing the 350 watt psu which shuts down from the overcurrent pulse and takes about 2 or 3 minutes worth of powerdown to recover. Intolerable in service. I have FF1=1, and Pgain=250000, 500000 oscillates violently and if just moving a short distance, the stop-null is a pid.error below .002xxxx in 95% of the tests. I could tolerate that but not the psu shutdown. So what do I turn up in order to better decelerate it in anticipation of the upcoming null/stop? And do I have to turn it way up? Dgain=0.2 did not seem to have any of the desired effect, yet its way too much for steppers, but does it need scaled way up like Pgain is? Thanks all. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
