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Tuning and Control Loop Performance, Fourth Edition, 4th Edition by Gregory K. McMillan

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APPENDIX D

DISCUSSION

The following are questions and answers posted on the Emerson Exchange 365 Mentoring Discussion website as part of the ISA Mentor program.

DANACA JORDAN’S QUESTION ON TUNING USUALLY INACTIVE LOOPS

I am trying to improve the control of a differential pressure controller (PDIC) that is only turned on when things go wrong on a particular product, so it is only active a couple unplanned hours at a time. Any suggestions for using limited historian or Insight data to improve tuning?

GREG MCMILLAN’S ANSWER

You can estimate the dead time from the time it takes the proportional-integral-derivative controller (PID) process variable (PV) to change direction after a change in PID output direction when the PDIC is active. For a large ...

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