. i.portion, I portion – Burkert Type 8693 User Manual
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General Rules (Appendix)
57.2. i portion
Function:
(5)
t
d
d
X
i
T
1
Y
∫
=
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
Step response
X
Xd
Ymax
Ymin
Adjustment range
∆Y
Xd
dY
dt
Figure 134: 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.
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Type 8692,8693