Re: [foxboro] Controller Issue after upgrade
- From: Terry Doucet <doucet427@xxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 6 Jun 2012 17:30:04 -0400
The PD control in CP30 should be the same as PD control in CP270 if all your
settings are the same. You might also look at LIMOPT as there were changes
between software versions for this parameter's affect on the PIDA block.
Terry
> To: foxboro@xxxxxxxxxxxxx
> Subject: Re: [foxboro] Controller Issue after upgrade
> From: neil_martin@xxxxxxxxxxxx
> 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>
> Sent by: foxboro-bounce@xxxxxxxxxxxxx
> 06/06/2012 03:19 PM
> Please respond to
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> To
> "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
> cc
>
> 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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