Control engineering: A guide for beginners, Third Edition by Manfred Schleicher, Frank Blasinger

By Manfred Schleicher, Frank Blasinger

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Certain chemical processes (reactions, neutralization) can sometimes proceed very quickly. As well as the delay and response times, another important characteristic of the process can be determined, the maximum rate of rise Vmax. It is obtained from the slope of the tangent at the point of inflection (see Fig. 04 2 The process change in process variable ∆x V max = ------------------------------------------------------------- = -----unit time ∆t As shown later in the section on optimization, the maximum rate of rise is also referred to when setting control parameters.

Determining the measurement site ! Assessing the disturbances ! Selecting the manipulator ! Selecting a suitable controller ! Installation of the controller in accordance with applicable regulations ! Starting up, adjusting parameters, optimizing Fig. 14: Tasks of a control engineer By control engineer, we don’t mean specialist engineers and technicians from universities or research departments, who work in the laboratory developing controllers, control algorithms or special control circuits. Specialists such as these require a much more extensive knowledge.

This applies particularly to plastics processing machines. However, PD controllers, like the P controller, always have a permanent deviation, when controlling processes with self-limitation. 6 PID controller We have seen earlier that the combination of a D component or an I component with a P controller offered certain advantages in each case. Now it seems logical to combine all three structures, resulting in the PID controller. With this controller, the XP , Tn , Td parameters are adjusted for the P, I and D action.

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