Re: [foxboro] FFTUNE with PIDA
- From: "foxpat" <foxpat@xxxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Mon, 11 Jun 2012 18:51:11 +0200
Farina,
The disturbance variable is linked to DTIME.MEAS, then a LLAG block with
LLAG.MEAS = DTIME.OUT, then a AIN BLOCK with AIN.MEAS = LLAG.OUT and finaly
PIDA.BIAS (not BBIAS as I mistakenly wrote) = AIN.PNT.
The use of the AIN is a choice we made and is typically only used to change
the gain with KSCALE. The PIDA.KBIAS can be used as well but it cannot be
set from the detail display so not easy for tuning.
In some cases the AIN is replaced by a CALC block.
We do not have a significant amount of these loops and did not think to much
on opening/closing the FF loop. If maintenance needs to be done on the FF
instrument then the complete loop will have to be put in manual.
If the loop is in AUTO then typically the process is either at normal
conditions (or not to far out). Also the FF to the PIDA can be limited
between realistic/nominal values which will prevent disaster in case the FF
loop would fail.
Regards,
Patrick
-----Oorspronkelijk bericht-----
Van: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
Namens Luciano André Farina
Verzonden: maandag 11 juni 2012 13:01
Aan: foxboro@xxxxxxxxxxxxx
Onderwerp: Re: [foxboro] FFTUNE with PIDA
I 'played' with it in a simulated transfer function.
The black box part is an inconvenient part to me too, it is not possible to
have access to tuning FF parameters, am I wrong? Otherwise, in simulation
the results were fine.
Patrick, do you hava a kind of block diagram of your implementation? How it
works with opening/closing loops?
Best regards,
Farina
Em terça-feira, 5 de junho de 2012, foxpat escreveu:
>
> I 'played' with it but decided it was not for me..
> To much of a black-box, to little practical examples but most of all,
> I like to know what I'm doing and have full control over all
> parameters.
> We stick to conventional feedforward scheme's with LLAG, DTIME, CALC,
> BIAS etc blocks and link the feedforward to PIDA.BBIAS
>
> However, I could have asked the same questions when I first started
> with I/A and the above mentioned statements would not have kept me
> from trying. I'm suggesting you give it a go!
>
> Kind regards,
>
> Patrick Martens,
> Zeeland Refinery
>
>
>
> -----Oorspronkelijk bericht-----
> Van: foxboro-bounce@xxxxxxxxxxxxx <javascript:;> [mailto:
> foxboro-bounce@xxxxxxxxxxxxx <javascript:;>] Namens Marc Hunter
> Verzonden: dinsdag 5 juni 2012 3:01
> Aan: foxboro@xxxxxxxxxxxxx <javascript:;>
> Onderwerp: [foxboro] FFTUNE with PIDA
>
> Anyone have experience using the FFTUNE with PID blocks?
> Looking for a tutorial of samples to ensure correct block
> configuration/connections.
>
> Thanks,
>
> Marc L. Hunter
> Synergy Systems Inc.
> 1982 Ohio Street
> Lisle, IL 60563
> +1 (630) 724-1960
> hunter@xxxxxxxxxxxxx
> <javascript:;><mailto:hunter@xxxxxxxxxxxxx<javascript:;>
> >
> [cid:image001.jpg@01CD428C.B630AB70]
>
>
>
>
>
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_______________________________________________________________________
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Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
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