Siemens SINAMICS S120 Function Manual page 83

Band-stop with defined reduction
Table 3-5 Example of band-stop
STARTER filter parameters
Blocking frequency 500 Hz
Bandwidth 500 Hz
Notch depth infinite dB
Reduction --10 dB
General conversion to parameters for general order filters:
S Numerator frequency f
S Numerator damping D
S Denominator frequency f
S Denominator damping D
© Siemens AG, 2005. All rights reserved
SINAMICS S120 Function Manual, 06/05 Edition
Amplitude log frequency curve
ω
Z
= f
=
Z 2π Sp

⋅ 1
K
= 10
⋅
20
Z 2
ω
N
= f ⋅ 10
=
N
2π Sp
f
BB
=
N
2 ⋅ f ⋅ 10
Sp
Operating Modes
Phase frequency curve
 
2
f
2
1 − 1
BB
+
Abs
10 f ⋅ 10
2
20
Sp
Abs
40
Abs
40
Servo control
Abs
10
3-83