Noel wrote: >Dino, >The Omrons are similar (if not the same) as Yaskawas. >I run the 5I20, 7I33 and 7I37s. Works good. >Tuning is tricky as the drive/motor combo has a PID loop itself, and EMC >adds and external position loop. > > I set up some Yaskawa ServoPak drives (SGDP I think was the model) using my Universal Stepper Controller, and it was quite an amazing system. I used it in step/direction mode, and tried it both open-loop and with the ServoPak's encoder outputs connected to the Stepper Controller, so you could go to e-stop, spin the motor by hand, and then go back to CNC mode and it would maintain position throughout. I had no tuning problems at all, it was an amazingly dynamic system. I didn't want to mar the motor shafts, but it felt like I could have put a pair of vise-grips on the shaft and not moved the motor a fraction of a degree.
If you use it closed-loop, you want very little P gain in the computer loop. Jon ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
