Servo Control - Siemens SINAMICS S120 Function Manual

Servo control

Definition
This type of closed-loop control enables operation with a high dynamic response and
precision for a motor with a motor encoder.
The motor connected to servo control is simulated in a vector model based on data from the
equivalent circuit diagram. This means that the servo control is also a vector control.
However, for servo control, the vector model is optimized according to other criteria. In favor
of maximum dynamic performance, a small deterioration in the control accuracy and control
quality is taken into consideration.
Characteristics of the servo control:
● Maximum computing speed
● Shortest sampling times
● Maximum dynamic performance
● Preferably used with permanent magnet synchronous motors with the appropriate
dynamic performance
A servo control with encoderless operation must be verified in a test application. Stable
operation in this mode cannot be guaranteed for every application.
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
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