Re: Handling of ramps and DVs in DMC sub-controllers

Posted by Richard Hughes on April 23, 2003 at 08:25:36:

In Reply to: Handling of ramps and DVs in DMC sub-controllers posted by Keith Landells on February 20, 2003 at 18:54:18:

I believe that the reason that the whole controller shuts down is due to the point in the controller cycle at which the imbalance is detected.

For example if a sub-controller detects that a critical variable has gone bad, it detects this during the input variable validation, before the LP is run

But .. if a ramp is imbalanced this is not detected until the LP solution has completed and failed to "balance the ramp"
If a single sub-controller was switched off this would require a second LP solution, with no guarantee that there is enough time for it to run

So as a pragmatic solution the whole controller is switched off

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• Re: Handling of ramps and DVs in DMC sub-controllers Venky Venkataraman 08:40:31 04/30/03 (0)

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Comments:
: 
: I believe that the reason that the whole controller shuts down is due to the point in the controller cycle at which the imbalance is detected.

: For example if a sub-controller detects that a critical variable has gone bad, it detects this during the input variable validation, before the LP is run

: But .. if a ramp is imbalanced this is not detected until the LP solution has completed and failed to "balance the ramp"
: If a single sub-controller was switched off this would require a second LP solution, with no guarantee that there is enough time for it to run

: So as a pragmatic solution the whole controller is switched off


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