D Pid Control And Feedback Tuning - GE Uniflux 10 Instrucciones De Funcionamiento

D PID control and feedback tuning

D.1 Introduction
PID parameter description
Parameter Meaning
P Proportional
I Integrating
D Derivating
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Behaviour
Guides the process to
its setpoint with an in-
put that varies pro-
portinally to the error.
Samples the error over
time and reinforces
the regulator output
as long as the error is
not eliminated.
Delivers an inital "kick"
to the regulator with
an amplitude that is
proportional to the er-
ror change rate.
Usage
Reduces the effect of an error but does not
completely eliminate it. A simple P-regulator
results in a stable stationary error between
actual and requested flow or pressure.
Too large P-component will make the
•
system unstable.
Too small P-component will make the
•
regulator slow and prevent it from elimi-
nating the error entirely.
The I parameter eliminates the stationary er-
ror, but results in a slight instability leading to
oscillations in the actual flow or pressure. The
I parameter can have values between 0 and
infinity.
Too large I-component will cause the sys-
•
tem to oscillate after the error has been
eliminated.
Too small I-component will prevent the
•
regulator from eliminating the entire error.
The D parameter can reduce the oscillations
introduced by a PI-regulator. D can have val-
ues between 0 and infinity.
Too large D-component may cause the
•
system to overshoot initally and make the
system sensitive to noise.
Too small D-component may cause for
•
the system to respond slowly to errors and
possiblly oscillate.
UniFlux 10 Instrucciones de funcionamiento 28993587 AE