Siemens SINAMICS S120 Function Manual page 202

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Servo control

5.23 Voltage precontrol

4. Measure a current controller setpoint step change again (see figure below)

The measurement result in the example indicates that after reaching the setpoint, the

current decays according to an exponential function (1-exp(-t/Tsm)). You estimate the

smoothing time based on the time from the point of contact of the initial tangent with the final

value straight line.

5. Enter the time constant in p1735.

6. In p1734, enter by what percentage the setpoint point of contact should extend beyond the

final value straight line (e.g. (1.5A/1.32A -1)·100 % = 13.6 %).

Example: Prior to optimizing

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

Drive functions