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Properties.of.pid.controllers, . p.portion, Properties of pid controllers – Burkert Type 8693 User Manual

Page 234: Ut 0,42 v t, P portion

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234

General Rules (Appendix)

57.

prOperTies Of pid cOnTrOllers

A PID controller has a proportional, an integral and a differential portion (P, I and D portion).

57.1. p portion

Function:

u

T

0,42

v

T

=

Kp is the proportional coefficient (amplification factor). It is the ratio of the adjusting range ∆Y to the proportional
range ∆Xd.

Characteristic.and.step.response.of.the.P.portion.of.a.PID.controller

Characteristic

Step response

Xd

X

Ymax

Ymin

Y0

Kp⋅Xd

t

t

Xd

Y

Proportional range ∆Xd

Y

Adjustment range

∆Y

Figure 133: Characteristic and step response of the P portion of a PID controller

Properties

In theory a pure P-controller functions instantaneously, i.e. it is quick and therefore dynamically favorable. It has a
constant control difference, i.e. it does not fully correct the effects of malfunctions and is therefore statically relatively
unfavorable.

english

Type 8692,8693

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