Current Setpoint Filter - Siemens SINAMICS G220 Operating Instructions Manual

Functions
14.10 Closed-loop drive control
14.10.6

Current setpoint filter

Overview
A current setpoint filter suppresses critical frequency components and thereby prevents the
excitation of oscillations by the speed controller. A current setpoint filter therefore increases the
achievable machine dynamics in critical applications.
Requirement
The Dynamic Drive Control operating mode or the closed-loop speed control mode is selected.
Description of function
The converter has 2 current setpoint filters connected in series. The following choices are
available for each current setpoint filter:
• PT2 low-pass
Figure 14-149
• General 2nd order filter
Figure 14-150
With the correct adjustment, it is possible to achieve a bandstop or a low-pass with reduction.
Depending on p1699, changed filter settings take effect at different times:
• p1699 = 0
The changed settings take effect immediately.
• p1699 = 1
The changed settings do not take effect until p1699 = 0.
548
f = Denominator natural frequency
N
D = Denominator damping
N
Transfer function of the 2nd order low-pass
f = Numerator natural frequency
Z
D = Numerator damping
Z
f = Denominator natural frequency
N
D = Denominator damping
N
Transfer function for a general 2nd order filter.
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB
SINAMICS G220 converter