Current Setpoint Filter - Siemens Sinamics S110 Function Manual

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)
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:
Denominator natural frequency f
Denominator damping D
Table 7- 2 Example of a PT2 filter
STARTER filter parameters
Characteristic frequency f
Damping D 0.7 dB
N
Function Manual
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
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
N
Amplitude log frequency curve
500 Hz
N
N
Drive functions
7.1 Servo control
Phase frequency curve
137