Howard Chan wrote: > I am using 5I20 and 7I33T to control the servo amplifier (SANYO DENKI). > When the turn on the emc, the DAC output generate a noise. > > http://myweb.polyu.edu.hk/~icwfchan/P1.png
I think you have a tuning issue. PID controllers operate on error only, when there is no error the PID controller outputs nothing. I think what you're seeing is this: Your axis is off-target a little bit, that is, it has a positioning error. The PID controller tries to correct, but it overcorrects, resulting in small-scale oscillation around the target. The magnitude of this oscillation may even be smaller than the magnitude of your backlash. Show us another halscope screenshot, this time with dac-02-value and the error signal for the PID controller that drives dac-02. Also show us your PID tuning parameters for that axis. -- Sebastian Kuzminsky how many no money boys are crazy how many boys are raw how many no money boys are rowdy how many start a war ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
