Siemens SINAMICS S120 Function Manual page 105

Table 3- 3 Example of a PT2 filter
STARTER filter
parameters
Characteristic frequency
f 500 Hz
N
Damping D 0.7 dB
N
Band-stop with infinite notch depth
Table 3- 4 Example of band-stop with infinite notch depth
STARTER filter
parameters
Blocking frequency f =
Sp
500 Hz
Bandwidth (-3 dB) f =
BB
500 Hz
Notch depth K = -∞ dB
Reduction Abs = 0 dB
Simplified conversion to parameters for general order filters:
● Reduction or increase after the blocking frequency (Abs)
● Infinite notch depth at the blocking frequency
● Numerator natural frequency f
● Numerator damping D
● Denominator natural frequency f
● Denominator damping:
Drive functions
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Amplitude log frequency curve
Amplitude log frequency curve
= f
Z
= 0
Z
N
Sp
= f
Sp
Servo control
3.7 Current setpoint filters
Phase frequency curve
Phase frequency curve
103