Drive functions
7.1 Servo control
Function Manual
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
137
7.1.7 Current setpoint filter
Description
The two current setpoint filters connected in series can be parameterized as follows:
● Low-pass 2nd order (PT2: -40 dB/decade) (type 1)
● General filter 2nd order (type 2)
Bandstop and lowpass with reduction are converted to the parameters of the general filter
2nd order via STARTER.
– Bandstop
– Low-pass with reduction by a constant value
The phase frequency curve is shown alongside the amplitude log frequency curve. A phase
shift results in a control system delay and should be kept to a minimum.
Function diagram 5710 (see SINAMICS S110 List Manual) illustrates how the current
setpoint filter operates.
Transfer function:
V
I
'
I
+
1
1
1
V
V
˭
˭
Denominator natural frequency f
N
Denominator damping D
N
Table 7- 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
I
1
+]
G%
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