Re: [foxboro] Controller Issue after upgrade
- From: Neil Martin <neil_martin@xxxxxxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Wed, 6 Jun 2012 15:48:45 -0500
I am not sure if is applicable, but depending on the previous software
version (and I don't remember the specifics), some control loops have been
known to respond differently after an upgrade. This is because a software
version that was released since the older version corrected a problem that
the controller block had in the older software version.
Neil Martin, P.E.
Huntsman Performance Chemicals
Conroe & Dayton , TX.
Conroe ph) 936-760-6205
Dayton ph) 936-257-4212
pager) 936-522-0052
"Johnson, David" <David.Johnson@xxxxxxxxxxxxxxxxxx>
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06/06/2012 03:19 PM
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[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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