Siemens SINUMERIK 840C - Page 1116

08.96 12 Functional Descriptions
12.33.3 Current setpoint filter
Filter in the case of resonance at and above the controller stability limit
Low-pass
– With resonance bundle
– Distribution of resonance phenomena (dependent on traversing direction, speed)
Low-pass as current setpoint filter
A low-pass filter is the better solution in cases where a peak occurs in the amplitude response
that is not linked to a fixed frequency, but wanders under different conditions. With a low-pass
filter, the signal above the entered natural frequency is damped. Reduced damping results in
less phase rotation below the natural frequency and thus to a greater phase margin.
a a a a a a a a a a a a a a a a a a a a a a a a
a
a a a a a a a a a a a a a a a a a a a a a a
a
a
a a a a a a a a a a a a a a a a a a a a a a
a
a a a a a a a a a a a a a a a a a a a a a a a a
Amplitude response
a a a a a a a a a a a a a
a
a a a a a a a a a a a
a
a
a a a a a a a a a a a
a
a
a a a a a a a a a a a
a
a
a a a a a a a a a a a
a
a
a a a a a a a a a a a
a
a a a a a a a a a a a a a
Magnitude
[dB]
a a a a a a a a a a a a
a
a a a a a a a a a a
a
a
a a a a a a a a a a
a
a
a a a a a a a a a a
a
a a a a a a a a a a a a
log f [Hz]
a a a a
a
a a
a
a
a a
a
a
a a
a
a a a a
10
2
a a a a a
a
a a a
a
a
a a a
a
a a a a a
10
3
a a a a a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a
a a a
a
a a a a a
10
3
0
-3
-10
-20
-30
a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a
Phase response
a a a a a a a a a
a a a a a a a a a
a a a a a a a a a
a a a a a a a a a
a a a a a a a a a
a a a a a a a a a
a a a a a a a a a
Phase
angle
a a a a a a a a a a a a
a
a a a a a a a a a a
a
a
a a a a a a a a a a
a
a a a a a a a a a a a a
log f [Hz]
a a a a
a
a a
a
a
a a
a
a a a a
10
2
a a a a a
a
a a a
a
a
a a a
a
a a a a a
10
3
a a a a a a a a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a
a a a a a a
a
a a a a a a a a
180
90
0
-90
-180
a a a a
a
a a
a
a
a a
a
a a a a
0.2
a a a a
a
a a
a
a
a a
a
a a a a
1.0
0.5
a a a a
a
a a
a
a
a a
a
a a a a
1.0
0.5
a a a a
a
a a
a
a
a a
a
a a a a
0.2
Fig. 12-4 Low-pass behaviour at natural frequency of 1000 Hz
and variation in damping of 0.2, 0.5 and 1.0
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SINUMERIK 840C (IA)