Apc With Acceleration Feedback - Siemens SINAMICS S120 Function Manual

8.14.5

APC with acceleration feedback

Description
Using this function, the acceleration signal from a direct measuring system is used to
dampen oscillations.
Only oscillations that can be measured at the direct measuring system can be dampened. If
this is not the case, then an external acceleration sensor can be mounted at a favorable
location within the machine, and used for APC.
For instance, this function is well-suited for axes, where the oscillation only has a low effect
on the motor (e.g. due to a high ratio - or significant self locking of a gearbox).
Frequently, when using a direct measuring system, high-frequency resonance points occur
in the range > 100 Hz in the control loop, which can result in significant problems when
setting APC. In cases such as these, the APC filter must be used in order to ensure control
loop stability. It must also be taken into consideration that resonance effects such as these
are dependent on axis positions, for example. The parameterization selected must be stable
in the complete machining space of the machine. This is also the reason that using the
function without a direct measuring system (see Chapter "Active Vibration Suppression (APC
without sensor on the load side) (Page 597)") is frequently a more rugged solution.
Before the function can be optimized, the speed controller loop must first be optimized as
this forms the subordinate control loop.
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
8.14 Advanced Position Control (including Active Vibration Suppression)
Function modules
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