Siemens SINAMICS S120 Function Manual page 107

Conversion to parameters for general order filters:
● Denominator natural frequency f
● Numerator natural frequency f
● Denominator damping D
● Numerator damping: D
General 2nd order filter
The following image shows the transfer function for a general filter 2nd order.
f = Numerator natural frequency
Z
D =numerator damping
Z
f = Denominator natural frequency
N
D
N
Table 5-7 Example: General 2nd order filter
Filter parameters
Numerator frequency f =
Z
500 Hz
Numerator damping D =
Z
0.02 dB
Denominator frequency
f = 900 Hz
N
Denominator damping D
N
= 0.15 dB
Function diagrams (see SINAMICS S120/S150 List Manual)
● 5700
● 5710
● 5711
Drive functions
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
Z
= Denominator damping
Amplitude log frequency curve
Servo control - Current control, overview
Servo control - Current setpoint filters 1 ... 4
Servo control - Current setpoint filters 5 ... 10 (r0108.21 = 1)
= f (start of reduction)
N Abs
Z
= 0.7
N
= 0.7
Phase frequency curve
Servo control
5.7 Current setpoint filter
105