Monthly Archive: March 2008

Mar
14

Common Control Myths – Part 4

My head is spinning with myths. The examples seem endless. (11) The process dynamics can be identified with the controller in auto without any perturbation – a loop startup or shutdown, change in set point, or an injection of a pulse or step in the controller output is needed to sort out the process dynamics …

Continue reading »

Mar
08

Common Control Myths – Part 3

Before I leave to enjoy a crawfish boil and Cajun music, here are some more myths. (6) Loop oscillations can always be decreased by reducing the controller gain – too low of a controller gain can cause nearly sustained slow rolling oscillations in an integrating process (e.g. level or gas pressure) and instability in a …

Continue reading »