Re: [foxboro] Controller Issue after upgrade
- From: Gregory A Hurwitt <gregory.hurwitt@xxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Wed, 6 Jun 2012 16:07:23 -0500
Couple things to check off the top of my head:
- Is anything connected to (or writing to) INITI?
- Is there any chance that the setting for INCOPT somehow got changed?
______________________________________________________________________________________
Greg Hurwitt
BASF- Freeport, TX
From: "Johnson, David" <David.Johnson@xxxxxxxxxxxxxxxxxx>
To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
Date: 06/06/2012 03:21 PM
Subject: [foxboro] Controller Issue after upgrade
Sent by: foxboro-bounce@xxxxxxxxxxxxx
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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