Howard Chan wrote: > Before I asked you a same question, at that time you suggest me using > analog mode to control my SANYO DENKI servo amplifier. Yet, I can solve > the error so large problem,(http://myweb.polyu.edu.hk/~icwfchan/p4.png) > especial accelerate and decelerate. I need set a large feed error, the > machine can be run. I think is it using an old firmware/driver or my > servo amplifier setting is wrong??
I'm sorry, but I can't really understand what you are saying. The performance of any servo system depends on how well the system is tuned. Tuning is one of those processes that is very hard to teach on a mailing list. In my opinion, there is no substitute for simply spending time varying the various gains and carefully observing the results. > Some people suggest me setting the servo amplifier to close loop. But I > only use semi-closed control, is it any problem? Control loop theory is complex. We don't know enough about what you are trying to do to tell you the "best" way to do things. There probably isn't really a single "best" way. > I have another question. According to manual page.7-4(PDF page.117), the > servo system structure said that there is a velocity loop in the servo > amp but there is other close loop in the emc program. Is it means that > there are two closed loop in my system, is it redundancy and what is the > difference between them? The drive has a velocity loop, EMC has a position loop. Such "nested" loops are a well accepted way of doing things (although not the only way). Regards, John Kasunich ------------------------------------------------------------------------------ Check out the new SourceForge.net Marketplace. It is the best place to buy or sell services for just about anything Open Source. http://p.sf.net/sfu/Xq1LFB _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
