Re: [foxboro] Controller Issue after upgrade
- From: "Joseph M. Riccardi" <Joe@xxxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 6 Jun 2012 17:19:10 -0400
David,
With all of the help you have provided me (and I want to thank you again), I
hope this does not sound too dumb, but... If there is no Integral, is it
not going to act "as though the loop is in open loop control"? Without
Integral, there is no feedback correction. Maybe I am confused...
PS. Along the lines of Greg's "Is there any chance that the setting for
INCOPT somehow got changed?"... The AOUT's ATC will have a similar affect
if it is driving in the wrong direction...
Joseph M. Riccardi
386-441-0250 Office
386-451-7607 Cell
Joe@xxxxxxxxxxxxx
"To give real service you must add something that cannot be bought or
measured with money; and that is sincerity and integrity." - Donald A. Adams
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Johnson, David
Sent: Wednesday, June 06, 2012 4:20 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] Controller Issue after upgrade
Hello all,
We are looking into some strange behavior after a recent upgrade from a CP30
to an FCP270. A PIDA block was set to be Proportional Derivative, MODOPT=3,
PBAND = 125, INT=0.075 (INT is BTIME in PD mode). The BCALCI and FBK were
both connected to the PIDA's own .OUT parameter. The Period is a 3, Phase
is a 2. I think the BPC of the CP30 and FCP270 are both .5 seconds.
Behavior
In the FCP270, the output drives to the low output limit. It's as though
the loop is in open loop control. Looking at trends indicate that this loop
was controlling in the CP30. The configuration is identical to what it was
in the CP30.
Any advice on what to check.
Thanks,
David
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