problem while tuning PID controller
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I try to tune a PID-Controller in Matlab2010b if i use a discrete one i get the error Message "The second input argument of the "d2d" command must be a positive scalar." if i use a continuous one i get "Input to SVD must not contain NaN or Inf." what i have to pay attention that this block works fine? My system can became NaN due to a Sqrt-expression....
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Arkadiy Turevskiy
on 6 Feb 2012
What is the purpose of the memory block that you are using at the output of the PID controller? Long story short, that is what creates the problem.
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Yoni
on 19 Jan 2012
Hi Martin,
I've had the same problem.
It seems the discrete PID option does not handle a sampling time of "-1" (should have inherited the sampling time it that case)
So the workaround for your problem is to enter your own explicit expression for the sampling time. do not leave it on "-1".
This should eliminate the "The second input argument of the "d2d" command must be a positive scalar."
Cheers, Yoni
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