Burkert Type 1110 - Handbuch (Seite 28)

26 - 1110
DIGITAL INDUSTRIAL CONTROLLER
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Functional Block 1: Filter at Input 1
Using the filter, the disturbance signals superimposed on the measured signal can
be damped. The filter is designed as a 1st order low-pass filter.
The limiting frequency of the filter can be set up within the range 0.1 to 20.0 Hz via
the parameters Fg1 (1st input) and Fg2 (2nd input) in Parameter (Filter menu) and
Configure (Input 1 and Input 2 menus).
• 0.1 Hz (strong damping, time constant 1.6 seconds)
• 20.0 Hz (weak damping, time constant 0.01 seconds)
5.7 Explanations of the controller structures' function blocks
ATTENTION!
As, in some cases, the filter constant can have an effect on the
regulation parameters, the settings of the limiting frequency of
the filter should always be carried out before setting the
regulation parameters.
Adjustable parameters:
Fg1: Limiting frequency (- 3 dB) of the filter at input 1.
Function block 2: Root extraction at input 1
This function serves to extract the square root of the input signal. It is needed
whenever the flow rate is measured as a pressure difference on a nozzle or
diaphragm (effective pressure method).
Function block 3: Scaling at input 1
Scaling assigns a numeric value to the measured electrical value that corresponds
to the physical measured quantity (Figure 15).
Adjustable parameters:
PVh: High scaling value, which is assigned to the maximum current,
voltage or frequency value.
PVl: Low scaling value, which is assigned to the minimum current,
voltage or frequency value.