Siemens SINAMICS S120 Function Manual page 600

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8.14 Advanced Position Control (including Active Vibration Suppression)

The diagram shows, as example, how an open APC circuit can be measured. The stability of

the control loop can be identified based on the amplitude reserve at the frequency where the

phase goes through -180° (in the example, at 200 Hz).

A damping effect is achieved, if, at the oscillation frequency (in the example, 18 Hz) the

phase is approximately at 0° - and at the same time the amplitude is in the vicinity of 0 dB.

APC without sensor on the load side (p3700 = 4) – open circuit

Function Manual, 11/2017, 6SL3097-4AB00-0BP5

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