Properties.of.pid.controllers, . p.portion, Properties of pid controllers – Burkert Type 8693 User Manual
Page 234: Ut 0,42 v t, P portion
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.
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Type 8692,8693