![]() Ziegler-Nichols algorithm shows the best performance with fastest rise time, settling time and was able to restore the system back to normal operating condition in a short time when subjected to disturbance compare to Cohen & Coon controller and Hagglund-Astrom algorithm settings. The time domain response analysis of the controllers shows that each tuning algorithm exhibit different time response. LabVIEW software was used to model a chemical process plant from open loop control test data. ![]() The control action of three different PID controller tuning algorithms namely Hagglund-Astrom, Cohen and Coon, and Ziegler-Nichols on the process plant was examined in a closed loop control configuration under normal operating condition and in the face of disturbance. Performance evaluation of a model based PID controller tuning algorithm on a chemical process plant is presented in this paper. Accurate tuning of controller in industrial process operation is prerequisite to system smooth operation which directly reduce process variability, improved efficiency, reduced energy costs, and increased production rates. So for a duty cyle of 75 (PID output 7.5) you switch on, count 750 millisecons, swich off, wait till the same counter reaches 1000 millisecons and then start again from the beginning.
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