Dynamic Servo Control (Dsc) - Siemens SINAMICS S120 Function Manual

fault (F30002) with a parameterizable voltage threshold (p1244). This is carried out by
activating the Vdc_max monitoring function (p1240 = 4, 6).
Function diagrams (see SINAMICS S120/S150 List Manual)
● 5650 Vdc_max controller and Vdc_min controller
Overview of important parameters (see SINAMICS S120/S150 List Manual)
Adjustable parameters
● p1240[0...n] Vdc controller or Vdc monitoring configuration
● p1244[0...n] DC link voltage threshold, upper
● p1248[0...n] DC link voltage threshold, lower
● p1250[0...n] Vdc controller proportional gain
Display parameters
● r0056.14 Vdc_max controller active
● r0056.15 Vdc_min controller active
3.15

Dynamic Servo Control (DSC)

Description
The function Dynamic Servo Control" (DSC) is a closed-loop control structure which is
computed in a fast speed controller clock cycle and is supplied with setpoints by the control
in the position controller clock cycle.
This allows higher position controller gain factors to be achieved.
The following prerequisites are necessary to use the "Dynamic Servo Control" function:
● n-set mode
● Isochronous PROFIBUS DP or PROFINET IO with IRT
● The position controller gain factor (KPC) and the position deviation (XERR) must be
● The position actual value must be transferred to the master in the actual value telegram
● When DSC is activated, the speed setpoint N_SOLL_B from the PROFIBUS DP or
● The internal quasi position controller uses the actual position value from the motor
Drive functions
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
included in the setpoint telegram of PROFIBUS DP or PROFINET IO with IRT (refer to
P0915).
of PROFIBUS DP or PROFINET IO with IRT via the encoder interface Gx_XIST1.
PROFINET IO with IRT telegram is used as a speed pre-control value.
measuring system (G1_XIST1) or the actual position value from the additional encoder
system (telegrams 6, 106, 116, and 118 or free telegrams).
Servo control
3.15 Dynamic Servo Control (DSC)
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