Delphin Expert Logger Manual page 143

Expert Logger
Continuous controller (PID)
With continuous controllers, the manipulated variable Y assumes any
value within a working range.
P controller: The P controller changes the manipulated variable immediately
l
proportionally to the change in the control deviation.
I controller: The I controller (integrator) assigns a particular control rate to a
l
particular control deviation.
PI controller: The PI controller is formed by combining a P controller with an I
l
controller. The PI controller contains a proportional and an integral term.
PD controller: The controller comprises a controller with a P term and a D
l
term. The derivative element assigns a manipulated variable to a particular
change rate of the control deviation.
PID controller: The manipulated variable consists of a proportional, an integ-
l
ral and a derivative term.
Controller choice
Controller
type
Loop
(with com-
pensation)
Pure dead time Unusable
Dead time and
delay
Expert Logger Manual
Januar 2018
P I
A little
worse
than PI
Worse
Unusable
than PI
143
PI PD
Setpoint
and dis- Unusable Unusable
turbance
A little
Unusable
worse than
PID
Setpoint
and dis-
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