Siemens SINUMERIK 840C Installation Instructions Manual page 1116

08.96
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.
10
Magnitude
[dB] 3
0
-3
-10
-20
-30
180
Phase
angle
90
0
-90
-180
Fig. 12-4 Low-pass behaviour at natural frequency of 1000 Hz
and variation in damping of 0.2, 0.5 and 1.0
© Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
Amplitude response
2
10
log f [Hz]
Phase response
2
10
log f [Hz]
6FC5197- AA50
12 Functional Descriptions
12.33.3 Current setpoint filter
0.2
0.5
1.0
3
10
1.0
0.5
0.2
10 3
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