Scale parameters and functions of the belt scale
8.5 Menu 1.3 Limits
SIWAREX WT241
Manual, 05/2015, A5E36046748A 67
If the scale is automatically calibrated using the load cell parameters and if
the scale is not installed exactly horizontally, you must subsequently enter
the inclination angle of the belt. The input is made in degrees.
1.4.4 Filter settings
A critically damped low-pass filter is provided to suppress interferences.
The diagram below shows the step response of the filter (f
g
= 2 Hz). The
entry "0" means that the filter is switched off. The cut-off frequency can be
specified between 0.05 and 50.0 Hz.
Figure 8-2 Step response of the digital low-pass filter when f
g
= 2 Hz
The definition of the cut-off frequency is extremely important for suppress-
ing interferences. Defining the cut-off frequency defines the "speed" of the
scale's response to changes in the measured value. A value of 5 Hz, for
example, results in a relatively rapid response to a change in weight; a val-
ue of 0.5 Hz makes the scale "slower".
The weighing system offers following filters:
Belt load low pass filter
Belt speed low pass filter
Flow rate average filter
Frequency „Belt
load“ low pass filter
(Hz)
Cutoff frequency of low pass filter for belt load
Set “0” to switch off the filter.
Cutoff frequency f
g
can range between 0.05…50 Hz.
Order number „Belt
load“ low pass filter
The number of the filter defines the effect of damping. The values 2, 4,
6, 8, and 10 can be set. The higher the selected order number, the
higher the damping effect of the filter.
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