Parameterization - Siemens SINUMERIK 840D sl Function Manual

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Table of Contents

B2: Acceleration

5.2 Functions

Since a vibration-capable filter setting is not expected to yield useful results in any case, as

with the jerk filter's "2nd-order filter" (PT2) low-pass filter (PT2) mode there is no setting option

for the denominator damping D

The bandstop filter can be parameterized in two different ways:

● Real bandstop filter

● Bandstop filter with additional amplitude response increase/decrease at high frequencies

Real bandstop filter

The real bandstop filter is applied when identical numerator and denominator natural

frequencies are selected:

If numerator damping setting = 0 is selected, the blocking frequency is equivalent to complete

attenuation. In this case the 3 dB bandwidth is calculated as follows:

3 dB bandwidth

If instead of complete attenuation, a reduction by a factor of k is all that is required, then

numerator damping should be selected in accordance with k. In this case the above formula

for calculating the 3 dB bandwidth no longer applies.

Bandstop filter with additional amplitude response increase/decrease at high frequencies

In this case, the numerator and denominator natural frequencies are set to different values.

The numerator natural frequency determines the blocking frequency.

By selecting a lower/higher denominator natural frequency than the numerator natural

frequency, you can increase/decrease the amplitude response at high frequencies. An

amplitude response increase at high frequencies can be justified in most cases, as the

controlled system generally possesses a lowpass characteristic itself, i.e. the amplitude

response drops at high frequencies anyway.

Supplementary conditions

If too high a numerator natural frequency is selected, the filter is disabled. In this case the

limiting frequency f