Dear Jon, Today I tune the PID again. Would you mind help me to check the value and give me some suggestion? Thank you!
[TRAJ] DEFAULT_VELOCITY = 13.30 MAX_VELOCITY = 33.34 DEFAULT_ACCELERATION = 45.0 MAX_ACCELERATION = 50.0 [AXIS_1] MAX_VELOCITY = 50.0 MAX_ACCELERATION = 50.0 BACKLASH = 0.000 INPUT_SCALE = -2835 When P=20, I=50, D=0, FF1=0, FF2=0 and click 'F2' http://myweb.polyu.edu.hk/~icwfchan/p1.png When P=20, I=50, D=0, FF1=0.198, FF2=0 and run 'Y=20' http://myweb.polyu.edu.hk/~icwfchan/p2.png When P=20, I=50, D=0, FF1=0.198, FF2=0.00021 and run 'Y=20' http://myweb.polyu.edu.hk/~icwfchan/p3.png Howard > Howard Chan wrote: > >> Dear Jon, >> Thanks you give me some suggest. Today I try to use small value of the >> P. But there are an error when I click 'F2'. >> http://myweb.polyu.edu.hk/~icwfchan/error.png >> Would you mind telling me what has happen? >> >> >> > WOW, very strange. I think it is integral windup. Your parameters of > huge I and small D are quite odd. Set I to zero first, and see if this > gyration when you hit F2 goes away. I think it will. > >> http://myweb.polyu.edu.hk/~icwfchan/x.png >> I would like to ask you is it the accel/decel too high and how can I >> find the best value of DEFAULT_ACCELERATION >> >> >> > Find out what the drive is capable of, by increasing it in moderate > steps until a large error suddenly appears during the accel/decel parts > of the move. Then, back off, say 20 to 25% from that value. On my > Bridgeport mill, if I turn up the accel too much, I break timing belts. > I know that the belts are undersized for the mass of the machine. > >> My setting: >> [TRAJ] >> DEFAULT_VELOCITY = 10.0 >> MAX_VELOCITY = 37.6 >> DEFAULT_ACCELERATION = 112.8 >> MAX_ACCELERATION = 138.0 >> >> [AXIS_0] >> MAX_VELOCITY = 56.4 >> MAX_ACCELERATION = 112.8 >> P = 4.000 >> I = 100.000 >> D = 0.00 >> FF0 = 0.000 >> FF1 = 0.089 >> FF2 = 0.0019 >> >> >> > Jon > > ------------------------------------------------------------------------------ > SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. > The future of the web can't happen without you. Join us at MIX09 to help > pave the way to the Next Web now. Learn more and register at > http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
