Re: [foxboro] PIDA-FBTUNE configuration

Neil,
The Thresh parameter is configured to detect the beginning of a disturbance,
think of it as a noise threshold under which fbtune will ignore the signal.
Tom Kinney
ExperTune Sales
262-628-0088 office
508-904-8926 cell


-----Original Message-----
From: Neil Martin [mailto:neil_martin@xxxxxxxxxxxx]
Sent: Tuesday, June 17, 2003 3:28 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] PIDA-FBTUNE configuration [bcc][bayes]



If I remember correctly, the FBTUNE in Selftune mode must see at least 3
significant peaks, possibly 4, in a row.  I believe the FBTUNE's THRESH
parameter is used to define what a significant peak is.  Note the value
entered for THRESH is % of the PIDA block range.

Neil Martin
Huntsman Polymers Corporation
2505 South Grandview
Odessa, TX.  79766
ph) 432-640-8436
pager)432-742-4289
email page)9157424289@xxxxxxxxxxxxxxxxxx


 

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Dear I/A users,

I have been trying now for days to set up a PIDA-FBTUNE combo to
automatically tune (selftune) a real level control application in a mineral
processing rougher circuit (I am trying only for a first stage rougher bank
before copying to others).

The question I have is why if I get a confirmed Peak_1 or Peak_2 search and
then the measurement crosses the setpoint value, I always have a "SETTLE"
status?  This brings back to search for Peak_1.

In other words, I know there will be another Peak after crossing the
setpoint value, but the algorithm somehow starts again from Peak_1 rather
than continuing the next peak search.

Please have a look at the lower left quarter screen trend, where we know
that there is a pattern in measurement (cyan color) against the setpoint
(purple).  The output is given in white.

What FBTUNE parameters can I adjust to prevent "SETTLE" when measurement
crosses the setpoint value (line)?

Many thanks for any insights given.

Budana Prijadi
(GMT +09:00)

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