Control Parameter [Ti]; Control Parameter [Td]; Control Parameter [Add. Basic Load]; Control Parameter [Checkout Time] - ProMinent DULCOMETER diaLog DACb Assembly And Operating Instruction

[Control]
Setting the
11.5

Control parameter [Ti]

[Ti] is the integral time of the I-con‐
The time
troller (integral controller) in seconds. The time
[Ti] defines the time integration of the control
deviation from the control variable. The smaller
[Ti] , the greater the effect on the con‐
the time
trol variable. An infinitely long time
a pure proportional control.
11.6

Control parameter [Td]

[Td] is the differentiation time of the D-
The time
controller (differential controller) in seconds.
The D-controller reacts to the rate of change of
the measured value.
11.7 Control parameter [Add.
Basic load]
[Add. Basic load] is the additive basic load. The
additive basic load should balance out a contin‐
uous requirement for feed chemical in order to
maintain the setpoint.
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 controller and is
effective in both control directions. E.g., if the
control variable calculated by the controller
equals
'
y= -10 % and the add. basic load equals +3
è
%, then the resulting control variable = Y= -10
% + (+3 %)= -7 %
y= 10 % and the add. basic load equals +3
è
%, then the resulting control variable = Y= 10 %
+ (+3 %)= 13 %
y= 0% and the add. basic load equals +3%,
è
then the resulting control variable = Y= 0 % +
(+3 %)= 3 %'
130
11.8
The
as a result of a malfunction.
During the
is compared with an adjustable
[Ti] results in
control variable threshold). Depending on the
control direction, you can set different values
for the
for increasing and
reducing.
The thresholds depend on the concentration of
the metered feed chemical. If the threshold is
exceeded, time recording starts
[(checkout time)] .
If during the
falls below the threshold, then the time is again
reset to
If the control variable remains exceeded for
longer than is permitted by the
then control stops immediately. This function
(Control stop) resets automatically once the
threshold is again undershot.
11.9
The
trol variable to be output. This makes sense if
an actuator is over-dimensioned and must not
be opened to 100 %.
11.10
Steadier control of flow processes using a feed‐
forward control.
Control parameter
[Checkout time]
[checkout time] should prevent overdosing
[checkout time] the control variable
[checkout times] [Checkout time
[Checkout time
[checkout time] the variable again
'0' s.
Control parameter [max.
ctrl var.]
[max. ctrl var.] specifies the maximum con‐

Interference variable

[threshold] (=
up ]
down] for
[checkout time] ,