Integrator Control - WEST PAM-198-P Technical Documentation Manual

5.5.2 Integrator control

Command
C:I_LIM
C:I_ACT
C:I_DZ
The parameter C:I_LIM limits the working range of the integrator in order to make a faster working of the con-
troller without important overshoots possible. Choosing too low values may lead to a not completely compen-
sated non-linearity of a valve.
C:I_ACT defines the activating threshold of the integrator. Not before the control deviation falls below this
value the integrator starts working. Reducing the integral part depending on the deviation is always active. The
advantage of this kind of control becomes noticeable at large command value changes. At first the P gain
eliminates the biggest part of the deviation. The I gain gets activated later to eliminate the remaining deviation.
An always active integrator would lead to overshoots because of too early pushing the signal.
In order to avoid limit cycling the C:I_DZ allows defining a Deadband around the setpoint. Within this range of
the control deviation the integrator will be stopped.
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Parameters
x x= 0... 10000
x x= 0... 10000
x x= 0... 1000
PAM-198-P
Unit
0.01 %
0.01 %
0.01 %
Group
CTRL
05.06.2020