Burkert 3280 - Setting Options for Running Process Controller

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Start-up
Type 3280, 3285
8.3.2 Setting options for running process controller
PV.SCALE/SP.SCALE
Scaling of the process controller
The function can be used to specify the following settings:
• Unit of the process actual value
• Position of the decimal point
• Values for the lower and upper process actual value
• Values for the lower and upper process set-point value
Scaling example for the 4...20 mA input
Process actual value from the transmitter: 4...20 mA corresponds to 0...10 l/min
Process set-point value from PLC: 4...20 mA corresponds to 0...8 l/min
Scaling value
[l/min]
Input signal
[mA]
Process set-point
value
Process actual value
4
0
10
20
PVmin
SPmin
PVmax
SPmax
Example for the input of scaling values
Version 1 Version 2 Version 3
PVmin 0 0 0
PVmax 1.0 10.0 100.0
SPmin 0 0 0
SPmax 0.8 8.0 80.0
Figure 25: Example of a sensor calibration
When setting up a process control, observe the following sequence: P.LIN → P.TUNE
P.LIN
Linearization of the process
This function can be used to linearize the process characteristic. In doing so, the nodes for the correction charac-
teristic are automatically determined. To do this, the program runs through the valve positioning range in 20 steps
and measures the associated process variable.
The correction characteristic and the associated value pairs are saved in the menu item CHARACT → FREE. This
is where they can be viewed and freely programmed.
P.TUNE
Self-optimization of the process controller
To obtain a good control performance, the structure and parameterization of the controller must be adjusted to
the properties of the process (control system). This function can be used to parameterize the PID controller inte-
grated in the process controller. In doing so, the parameters for the P, I and D-components of the PID controller
are automatically determined and transferred into the corresponding menus from (KP, TN, TV). This is where they
can be viewed and changed.
P.CONTROL
Parameterization of the process controller
• Insensitivity range (dead band).
This function specifies that the process controller will respond from a certain control difference only.
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