A fairly common stumbling block for those new to controller tuning relates to step 2 of the controller design and tuning recipe. Step 2 says to “collect controller output (CO) to process variable (PV) dynamic process data around the design level of operation.” But suppose disturbance rejection is our primary control objective (example studyhere). Shouldn’t […]
The controller design and tuning recipe we have used so successfully on this site requires that we bump our process and collect dynamic data as the process responds. For the heat exchanger and gravity drained tanks study, we generated dynamic data using a step test while the controller was in manual mode. One benefit of […]
Ziegler and Nichols first proposed their method in 1942. It is a trial-and-error loop tuning technique that is still widely used today. The automatic mode (closed-loop) procedure is as follows: