Endress+Hauser Liquiline System CA80CR, Руководство по эксплуатации

Страница: 114 / 188

Operation Liquiline System CA80CR
114
Hauser
Setup Level Options
• Standard
• Advanced
Factory setting
Standard
The Setup Level changes the number of parameters that
can be configured.
If you choose "Standard" the other controller parameters
are active nevertheless. The system uses the factory set-
tings which usually suffice in most cases.
Process type Options
• Inline
• Batch
Factory setting
Inline
Decide what type of process best describes your particu-
lar process (see the explanation below).
Batch process
The medium is in a closed system.
The task of the control system is to dose in such a way that the measured value (controlled variable) changes from its
start value to its target value. No more dosing is needed once the setpoint has been reached and the system is stable. If
the target value is overshot, a two-sided control system can compensate for this.
In the case of 2-sided batch control systems, a neutral zone is used/configured to suppress oscillations around the set-
point.
In-line process
In an in-line process, the control system works with the medium flowing by in the process. Here, the controller has the
task of using the manipulated variable to set a mixture ratio between the medium and dosing agent such that the resul-
ting measured variable corresponds to the setpoint. The properties and volume of the medium flow can change at any
time and the controller has to react to these changes on a continuous basis. If the flow rate and medium remain cons-
tant, the manipulated variable can also assume a fixed value once the process has settled. Since the control process is
never "finished" here, this type of control is also referred to as continuous control.
A mixture of both process types can often be found in practice: the semi-batch process. Depending on the ratio
between the flow and the container volume, this arrangement behaves either like a batch process or an in-line
process.
Controller type Options
• PID 1-sided
• PID 2-sided
Factory setting
PID 2-sided
Depending on the actuator connected, you influence the
process in just one direction (e.g. heating) or in both
directions (e.g. heating and cooling).
A 2-sided controller can output a manipulated variable in the range of -100% to +100%, i.e. the manipulated variable is
bipolar. The manipulated variable is positive if the controller should increase the process value. In the case of a pure P
controller, this means that the value of the controlled variable x is smaller than the set point w. Conversely, the manipu-
lated variable is negative if the process value should be decreased. The value for x is greater than the setpoint w.
The following graphic illustrates the relationship y = (w-x)/X
p
:
Path: Menu/Setup/Additional functions/Controller 1 or Controller 2
Function Options Info