By Frank Blasinger

his paintings is meant to be of functional guidance up to speed engineering know-how. the writer of this e-book is Frank Blasinger it's going to assist you to choose and manage an appropriate controller for varied functions.

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Additional resources for Control Engineering: A Guide for Beginners

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Instead PV slowly approaches the final value in a characteristic manner. As the time t increases (large value of t/T), the value of the expression in the brackets tends towards 1, so that for the final value, ∆x = KS • ∆y. As shown in Fig. 24, after a time t = T (time constant), the PV has reached 63% of the final value. After a time t = 5 T, the PV has almost reached 100% of the final value. Such processes are also referred to as T1 processes. If it is a process with self-limitation, it is referred to as a PT1 process; a process without self-limitation is an IT1 process.

XP is now set to 50, so that the gain of the P component is 2. Now the control difference is first amplified by a factor of 2, before it is offered to the I component.

In these processes the dead times are long in relation to the delay times. 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.

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