Siemens SINUMERIK 840C - Page 1126

08.96 12 Functional Descriptions
12.33.5 Speed setpoint filter
Example of speed setpoint bandstop
fz : Blocking frequency MD 1514/MD 1517
DZ : Damping numerator
fbz = 2 x Dz x fz : Bandwidth numerator MD 1515/MD 1518
Dn : Damping denominator
fbn = 2 x Dz x fn : Bandwidth denominator MD 1516/MD 1519
fn = MD 1520(%) x fz : Bandstop natural frequency MD 1520/MD 1521
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Amplitude response
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a
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Magnitude
[dB]
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a
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a
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a
a a a a a a a a a a a a
log f [Hz]
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10
3
0
-3
-10
-20
-30
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Phase response
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Phase
angle
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a
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a
a a a a a a a a a a a a
log f [Hz]
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10
2
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a
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a
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10
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180
90
0
-90
-180
707
1414
1000
1000
707
1414
707
1414
Fig. 12-9 Frequency response of general bandstop with blocking frequency f
z
= 1000 Hz,
bandwidth f
Bn
= 500 Hz, counter bandwidth f
Bz
= 0 Hz and variation in natural
frequency f
n
= 707, 1000 and 1414 Hz.
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 12–351
SINUMERIK 840C (IA)