Siemens SINAMICS S120 Function Manual page 87

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 natural frequency f
S Denominator damping D
© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition
Amplitude log frequency curve
500 Hz
= f
Z Sp
+
Z
2 @ f
+
2 @ f
N
Phase frequency curve
f
BB
K
@ 10
20
Sp
= f
N Sp
f
BB
Sp
Operating Modes
Servo control
3-87