Peter Nachtwey
Member
How was the cascaded loop tuned?
What did the cascased loops control?
What myths or rules of thumb have you heard or used?
What did the cascased loops control?
What myths or rules of thumb have you heard or used?
Good article. The only thing I don't agree with is the part where the inner loop must be much faster than the outer loop. This is one of the "myths" I mentioned. Yes, in general the inner loop is faster but by how much dependsThis is one of the better quick articles I had in my collection on the subject
http://www.engr.uconn.edu/control/pdf/isa04-1.pdf
Roy,I think the inner loop should be faster than the outer loop, it just seems to make sense.
I have never used auto-tuning but then I'm a grumpy old **** who thinks if you can't tune a loop you shouldn't be in the business.
Roy
Geeze U cant even say **** here, how PC is that?
I agree but that would limit the amount of product that can be installed and maintained.I have never used auto-tuning but then I'm a grumpy old **** who thinks if you can't tune a loop you shouldn't be in the business.
That too is a topic for another thread but the short answer is that most people say they have an auto tuner just for marketing hype. Most will only tune one kind of system which is a first order plus dead time system (FOPDT). If your system isn't a a FOPDT system then the auto tuning will not work.Mordred said:after I researched several articles on the subject and I never had faith in autotuners
This is better stuff. I like to go this deep only my emphasis is on motion control with acceleration, velocity and position loops.Mordred said:http://www.bgu.ac.il/chem_eng/pages/...Chapter_10.pdf
the other articles are I have are more basic and don't explain much
How was the cascaded loop tuned?
What did the cascased loops control?
What myths or rules of thumb have you heard or used?