I would be interested in the same answer. Like you, I have servos that are controlled by drives that close their velocity loop, and use PPMC (which is not really a part of the issue, just mentioning).
I had difficult times tuning them, though now I have the error pretty low (well under 0.001# when machining at low speed). But I am always interested to learn more and improve my tuning. i On Wed, Aug 11, 2010 at 5:25 PM, James Louis <[email protected]> wrote: > Hello everyone. I had this on the forum for a while: This question goes out > to any "servo loop" experts out there in EMC2 world. > I understand that EMC2 uses PID to form a control loop when using > servomotors, but . . . > what if you use a drive that already has its own loop? For example, my > machine uses Yaskawa SGM-0xA31x series servos, Yaskawa SGDA-0xAS series > analog drives, and a Pico Systems PPMC (ENC, DAC, DIO) interface. > > These drives receive the encoder signals and redirect them to the PPMC ENC > card, but have their own PID terms which are set during Autotuning. So is it > loop or loops? > > What effect do the PID terms in the EMC2 *.ini file have? I am using just > the P term right now and it works. The motors move OK, but I would like to > know HOW. Like what is an optimal value for the P term? Is HALscope the > right tool for this? If I use values in the other terms will this form a > second nested loop? Is that better? What about other INI entries like > DEFAULT_ACCELERATION, etc? > > Sorry if this has already been covered before, but I couldn't find it. There > is a lot more stepper info out there than servo. > > Thank you, and by the way . . . EMC2 is awesome! > > servo newbie getting loopy > > ________________________________ > This communication is for the use of the intended recipient only. It may > contain information that is privileged and confidential. If you are not the > intended recipient of this communication, the disclosure, copying, > distribution or use hereof is prohibited. If you have received this > communication in error, please advise me by return e-mail or by telephone and > then delete it immediately. > ------------------------------------------------------------------------------ > This SF.net email is sponsored by > > Make an app they can't live without > Enter the BlackBerry Developer Challenge > http://p.sf.net/sfu/RIM-dev2dev > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ This SF.net email is sponsored by Make an app they can't live without Enter the BlackBerry Developer Challenge http://p.sf.net/sfu/RIM-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
