Siemens SINAMICS S120 Function Manual page 84

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
General conversion to parameters for general order filters:
● Numerator natural frequency
● Numerator damping
84
Amplitude log frequency curve
= f
Z Sp
= f
N Sp
Amplitude log frequency curve
ω
= =
π
2
⎛
⎜
1 1
= • • ⎜ −
20
10 1
⎜ ⎜
2
⎝ 20
10
Phase frequency curve
Phase frequency curve
2
⎞
⎟
2
⎟ +
⎟ ⎟
2
•
⎠ 10
10
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Drive functions