General low-pass with reduction, Transfer function general 2nd-order filter, Servo control 3.7 current setpoint filter – Efficient Networks Siemens Sinamics S120 User Manual
Page 82: Denominator natural frequency, Denominator damping, Start of reduction) ● numerator damping, Denominator natural frequency f, Denominator damping d, Numerator natural frequency f, Numerator damping d
Servo control
3.7 Current setpoint filter
Drive Functions
82
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
● Denominator natural frequency
$EV
6S
1
1
I
I
=
˭
˶
● Denominator damping
$EV
6S
%%
1
I
I
'
General low-pass with reduction
Table 3-6
Example of general low-pass with reduction
STARTER filter parameters
Amplitude log frequency curve
Phase frequency curve
Characteristic frequency f
Abs
= 500 Hz
Damping D = 0.7
Reduction Abs = -10 dB
$EV G%
I
$EV
+]
G%
Conversion to parameters for general order filters:
● Numerator natural frequency f
Z
= f
Abs
(start of reduction)
● Numerator damping
$EV
$EV
=
I
I
● Denominator natural frequency f
N
● Denominator damping D
N
Transfer function general 2nd-order filter
V
I
'
I
V
V
I
'
I
V
+
1
1
1
=
=
=
V
˭
˭
˭
˭
Numerator natural frequency f
Z
Numerator damping D
Z
Denominator natural frequency f
N
Denominator damping D
N