Control Parameter [Type]; Control Parameter [System Response] - ProMinent DULCOMETER diaLog DACb Assembly And Operating Instructions Manual

[Control]
Setting the
Adjustable parameters in the [Control]
menu
13.1

Control parameter [Type]

P controller:
PI controller:
PID controller:
13.2

Control parameter [System response]

Standard
[Dead zone]
122
Make the following selection in the Control menu:
You set the controller type under the menu option
set the [Type] as [1-way] or [2-way] .
P, PI, PID controllers are continuous controllers. The control varia‐
bles can take any value in the control range from -100 % ... +100
%.
This controller type is used with an integrating control path (e.g.
[Batch Neutralisation] ). If the control deviation becomes small then
the control (actuation) of the actuator becomes smaller (propor‐
tional relationship). If the setpoint is nearly reached, then the con‐
trol output is nearly 0 %. However the setpoint is never exactly
reached. Consequently a permanent control deviation results.
When stabilizing large changes, excess oscillations may occur.
This controller type is used with a non-integrating control path (e.g.
flow neutralisations). Here excess fluctuation must be avoided. No
permanent control deviation must occur. The setpoint must always
be adhered to. A constant addition of metering chemicals is
required. It is not a malfunction when the controller does not stop
metering when the setpoint is reached.
This controller type has the properties of a PI controller. Due to the
differentiating control part
sight and can react to forthcoming changes. It is used when meas‐
urement spikes occur in the measurement curve and these must
be quickly regulated out.
You can set the system response of the controller under the menu
[System response] .
option
The controller reacts with its P, PI or PID system response as
Ä Chapter 13.1 'Control parameter [Type]'
described in
on page 122 .
[Standard] is the selection for [1-way ] controlled processes.
[Dead zone] is defined by an upper and lower setpoint. The
The
[dead zone] only operates with a [2-way] [control] , if an actuator is
available for each direction.
[dead zone] should have the effect of preventing the control
The
path from starting to oscillate. If the measured value lies within
both the setpoints, then no control of the actuators takes place. In
this case even a PI/PID controller does not activate its actuators.
[dead zone] is used with a [2-way] neutralisation.
The
[Type] . You can
[D] , it also offers a certain level of fore‐