I-Portion; Type - Burkert 8792 Operating Instructions Manual

Type 8792, 8793

Additional technical information
44.2.

i-portion

Function:
1
∫
=
Y X d t d (5)
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
X
Xd
dY
dt
Ymax
Xd
Ymin
Characteristic Step response
Fig. 118: 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 favourable
static behaviour. 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 unfavourable.
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