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Working with Self Tuner FB50

Created by: Georgio at: 10/29/2008 1:07 PM (1 Replies)

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10/29/2008 1:07 PM

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Georgio

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Joined: 10/28/2008

Last visit: 7/21/2023

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Hi all! (Sorry for my English Rolling Eyes

)

I cant find my topic in new thread i have made yesterday, so i create it once again.

I have a question about using of Siemens s7 300 PID Self Tuner (FB51).
I have connected this self tuner with PID regulator FB41.
I have created simple program with visualisation to try all posibilities about Self Tuner. But I found out that Self Tuner probably doesnt work I want to.

I have created several transfer function (in WINMOD - this program can simulate transfer functions of simulated systems) to control them:

Code:

Gs = 1/((2*s+1)*(16*s+1)), Gs = 1/((1*s+1)*(30*s+1)) ...

and so on.
Self Tuner identify (output parametres of Self Tuner) this system correctly, for example:

Code:

system Gs = 1/((2*s+1)*(16*s+1))

is identified as

Code:

Gs = 0,9881/((2,4763*s+1)*(16,2319*s+1)).

Then Self Tuner computes parametres of PI and PID regulator.
Parametres of PI regulator: P: 2,765, I: 9,821.
Parametres of PID regulator: P: 32,265, I: 5,076, D: 1,228.
This parametres are represents in FB 41 like this:

Code:

Gr = P(1+1/(Is)+Ds)

Behavior of PI regulator is very good, but PID regulator has big overshoots and regulation circuit oscilatted because of big P constant. I have tried a lot of transfer functions, but still one conclusion: good PI and PID regulator bad Crying or Very sad

.
But status design and status heating on the end of the process of self tuning is good (status design=2, status heating=2),
so its still ideal case of tuning Exclamation

My qustions:
1) have everybody some experiences with PID Self Tuner ? How does it work in your case ?
2) do you know where I can get some documents how Self Tuner works (except official help of self tuner ...) ?

Thanks a lot!!

Georgio

10/29/2008 10:45 PM	Rate (0)
CS Moderator Moderator Joined: 9/1/2005 Last visit: 8/24/2023 Posts: 4102 Rating: (193)	closed cause question posted twice. The second thread with the subject Working with PID Self Tuner FB51 is published within the conference STEP 7 Additional Software Best regards CS Moderator
	Last edited by: O_Moderator at: 3/17/2010 11:31 AM conference-link edited My Forum is the place to personalize your profile, track your topics, and maintain content that interests you. Best regards CS Moderator
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Created by: Georgio at: 10/29/2008 1:07 PM (1 Replies)

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Last edited by: O_Moderator at: 3/17/2010 11:31 AM

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