Siemens SINAMICS S120 Function Manual page 82

Operating Modes
Servo control
Band-stop with defined notch depth
Table 3-4 Example of band-stop with defined notch depth
STARTER filter parameters
Blocking frequency f
Sp =
Bandwidth f 500 Hz
BB =
Notch depth K = --20 dB
Reduction Abs = 0 dB
Simplified conversion to parameters for general order filters:
No reduction or increase after the blocking frequency
Defined notch at the blocking frequency K[dB] (e.g. --20 dB)
S Numerator frequency f
S Numerator damping D
S Denominator frequency f
S Denominator damping D
3-82
Amplitude log frequency curve
500 Hz
= f
Z Sp
=
Z
2 ⋅ f
= f
N Sp
=
N
2 ⋅ f
Phase frequency curve
f
BB
K
⋅ 10
20
Sp
f
BB
Sp
© Siemens AG, 2005. All rights reserved
SINAMICS S120 Function Manual, 06/05 Edition