Control Parameter [Ti]; Control Parameter [Td]; Control Parameter [Add. Basic Load]; Control Parameter [Checkout Time] - ProMinent DULCOMETER Assembly And Operating Instructions Manual

10.5

Control parameter [Ti]

[Ti] is the integral time of the I-
The time
controller (integral controller) in seconds.
[Ti] defines the time integration
The time
of the control deviation from the control
variable. The smaller the time
greater the effect on the control variable.
An infinitely long time
proportional control.
10.6

Control parameter [Td]

[Td] is the differentiation time of
The time
the D-controller (differential controller) in
seconds. The D-controller reacts to the
rate of change of the measured value.
Control parameter [Add.
10.7
Basic load]
[Add. Basic load] is the additive basic
load. The additive basic load should bal‐
ance out a continuous requirement for
feed chemical in order to maintain the set‐
point.
The additive basic load can be set in the
range -100 % ... +100 %.
The additive basic load is added to the
control variable determined by the con‐
troller and is effective in both control direc‐
tions. E.g., if the control variable calcu‐
lated by the controller equals
'
y= -10 % and the add. basic load
è
equals +3 %, then the resulting control
variable = Y= -10 % + (+3 %)= -7 %
y= 10 % and the add. basic load
è
equals +3 %, then the resulting control
variable = Y= 10 % + (+3 %)= 13 %
y= 0% and the add. basic load equals
è
+3%, then the resulting control variable =
Y= 0 % + (+3 %)= 3 %'
[Ti] , the
[Ti] results in a pure
Control parameter
10.8
[Checkout time]
[checkout time] should prevent over‐
The
dosing as a result of a malfunction.
[checkout time] the control vari‐
During the
able is compared with an adjustable
[threshold] (= control variable threshold).
Depending on the control direction, you
can set different values for the
[checkout times] [Checkout time " up ] for
[Checkout time " down] for
increasing and
reducing.
The thresholds depend on the concentra‐
tion of the metered feed chemical. If the
threshold is exceeded, time recording
[(checkout time)] .
starts
[checkout time] the variable
If during the
again falls below the threshold, then the
time is again reset to
If the control variable remains exceeded
for longer than is permitted by the
[checkout time] , then control stops imme‐
diately. This function (Control stop) resets
automatically once the threshold is again
undershot.
Control parameter [max.
10.9
ctrl var.]
[max. ctrl var.] specifies the maximum
The
control variable to be output. This makes
sense if an actuator is over-dimensioned
and must not be opened to 100 %.
10.10

Disturbance variable

More steady control of flow processes
using a feedforward control.
Setting the [Control]
'0' s.
107