Efficient Networks Siemens Sinamics S120 - Manual (Page 80)

Servo control
3.7 Current setpoint filter
Drive Functions
80
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
Table 3-2 Example of a PT2 filter
STARTER filter parameters Amplitude log frequency curve Phase frequency curve
Characteristic frequency f
N
500 Hz
Damping D
N
0.7 dB
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Band-stop with infinite notch depth
Table 3-3 Example of band-stop with infinite notch depth
STARTER filter parameters Amplitude log frequency curve Phase frequency curve
Blocking frequency f
Sp
= 500 Hz
Bandwidth (-3 dB) f
BB
= 500 Hz
Notch depth K = -∞ dB
Reduction Abs = 0 dB
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Simplified conversion to parameters for general order filters:
Reduction or increase after the blocking frequency (Abs)
Infinite notch depth at the blocking frequency
● Numerator frequency f
Z
= f
Sp
● Numerator damping D
Z
= 0
● Denominator natural frequency f
N
= f
Sp
● Denominator damping
6S
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1
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