Siemens SINAMICS S120 Function Manual page 88

Operating Modes
Servo control
Band-stop with defined reduction
Table 3-5 Example of band-stop
STARTER filter parameters
Blocking frequency f = 500 Hz
SP
Bandwidth f = 500 Hz
BB
Notch depth K = infinite dB
Reduction ABS = –10 dB
General conversion to parameters for general order filters:
S Numerator natural frequency f
S Numerator damping D
S Denominator natural frequency f
S Denominator damping D
3-88
Amplitude log frequency curve
w
+ + f
Z
Z
2p
K @ 1
+ 10 @
20
Z
2
w
+
N
N
2p
f
+
BB
N
2 @ f @ 10
Sp
SINAMICS S120 Function Manual, 03/2006 Edition
Phase frequency curve
Sp
2
f 2
1
1 * )
BB
Abs
@ 10
10 f 2
20
Sp
Abs
+ f @ 10
40
Sp
Abs
40
© Siemens AG 2006 All Rights Reserved
Abs
10