I-Portion - Burkert 8792 Operating Instructions Manual

Type 8792, 8793 Type 8792, 8793
Properties of PID Controllers
34.2

I-portion

Function:
1
∫
=
Y X d t d
i T
Ti is the integral action time or actuating time. It is the time which passes until the actuating variable has run
through the whole adjustment range.
Characteristic and step response of the I portion of a PID controller
Characteristic
Fig. 124: Characteristic and step response of the I portion of a PID controller
Properties
A pure I-controller completely eliminates the effects of any malfunctions which occur. It therefore has a favorable
static behavior. On account of its final actuating speed control it operates slower than the P-controller and has
a tendency to oscillate. It is therefore dynamically relatively unfavorable.
(5)
dY
dt
X
Xd
Ymax
Xd
Ymin
Step response
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