The three major types of process responses are self-regulating, integrating, and runaway. Self-regulating processes behave quite differently depending upon whether they are deadtime dominant or not. Tuning objectives can be minimum peak error and integrated error for load disturbances; minimum rise time and overshoot for setpoint changes; maximum coordination of loops, or minimum interaction between loops; and optimization of process metrics, such as process efficiency and capacity. Tuning rules have not addressed all types of responses and meeting objectives is often left to a consultant. Fortunately, a unification and simplification of major tuning rules has been discovered. Attendees of this presentation will learn how to achieve a large variety of process objectives without having to detune the PID.
- Discover how major tuning methods reduce to the same simple expressions
- Learn simple equations to predict loop performance
- Learn to tune PID controllers for maximum disturbance rejection and fastest rise time
- Understand how to use key PID features to achieve process objectives without detuning
- Learn how to adapt the reset time to prevent undershoot and overshoot
A retired Senior Fellow from Solutia/Monsanto, and an ISA Fellow, Greg McMillan presently contracts with Emerson Process Management. Throughout his career, he has been the recipient of numerous awards, including the ISA Life Achievement Award and Control Magazine's "Engineer of the Year" Award for the Process Industry. An inductee into the Process Automation Hall of Fame, McMillan is the author of numerous books on process control, his most recent being Essentials of Modern Measurements and Final Elements for the Process Industry.