Setting rules for the P, PI and PID controllers 4 Setting rules for the P, PI and PID controllers This page summarizes some of the setting rules found in the relevant literature. The setting rule to be used for a particular case has to be determined depending on the controlled system. Ziegler and Nichols Ziegler and Nichols The Ziegler and Nichols setting rules can be used if the controlled system can be approximated by a dead time element and 1st order delay element.
T t = dead time of the controlled system K s = gain factor of the controlled system T s = time constant of the controlled system Chien, Hrones and Reswick If this procedure is to be used, the step response of the system must show delay characteristics and be free from overshoot effects. From the step response the delay time T u , the compensation time T g and the system gain K s are determined. The system gain is calculated from the following quotient: The setting rules listed below can only be used if Tg/Tu > 3! TS4100 13 Version: 1.1