Siemens SINAMICS S120 Function Manual page 106

Servo control
3.7 Current setpoint filters
Band-stop with defined notch depth
Table 3- 5 Example of band-stop with defined notch depth
STARTER filter
parameters
Blocking frequency
f = 500 Hz
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)
● Numerator natural frequency f
● Numerator damping:
● Denominator natural frequency f
● Denominator damping:
Band-stop with defined reduction
Table 3- 6 Example of band-stop
STARTER filter
parameters
Blocking frequency
f = 500 Hz
SP
Bandwidth f = 500 Hz
BB
Notch depth K = -∞ dB
Reduction ABS = -10 dB
104
Amplitude log frequency curve
= f
Z
N
Amplitude log frequency curve
Sp
= f
Sp
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Phase frequency curve
Phase frequency curve
Drive functions