Properties.of.pid.controllers; Properties.of.pid.controllers; P-Portion - EBRO ARMATUREN EP 501 C Operating Instructions Manual

Typ EP 501
Additional technical information
35. PROPERTIES OF PID CONTROLLERS
A PID controller has a proportional, an integral and a differential portion (P, I and D portion).
35.1.

P-portion

Function:
Y=Kp . Xd
Kp is the proportional coefficient (proportional gain). 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
Figure 111: 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.
Y
Ymax
Y0
Ymin
Proportional range ∆Xd
Characteristic
X
Xd
Y
Kp⋅Xd
Xd
Step response
t
t
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