Tag Archives | loop tuning


PID Tuning Rules

Nearly every automation system supplier, consultant, control theory professor, and user has a favorite set of PID tuning rules. Many of these experts are convinced their set is the best. A handbook devoted to tuning has over 500 pages of rules. The enthusiasm and sheer number of rules is a testament to the importance of […]

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How to Avoid Common Tuning Mistakes

The proportional, integral, derivative (PID) controller is the common key component of all control loops. Basic control systems depend upon the PID to translate the measurement signals into set points of secondary loop controllers, digital valve controllers, and speed controllers for variable frequency drives. The success of advanced control, such as model predictive control, depends […]

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Bottoms level-to-flow cascade strategy

The Basics of Distillation Column Loop Tuning

Controlling distillation columns is a tough assignment due to the interacting nature of the process and the upstream/downstream effects of loop tuning. In this example, the column bottoms level control had stability problems (cycling), causing manual operation and the operators’ constant attention. The bottoms level needed to be controlled to a set point that minimized […]

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