Supplementary Functions For Vector Control; Moment Of Inertia Precontrol - Siemens SINAMICS S120 Function Manual

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Table of Contents

To activate the "Moment of inertia estimator" function module, proceed as follows:

1. Call the configuration of the drive in the Startdrive engineering tool in offline mode. Activate

the "Moment of inertia estimator / OBT" function module.

You can then check under r0108.10 in the parameter view whether the moment of inertia

estimator is activated.

2. Make the setting p1400.18 = 1 (moment of inertia estimator active) in the parameter view of

the drive object:

A data set changeover can be used to activate or deactivate the moment of inertia estimator

Additional settings and special issues

If the function for adapting the moment of inertia via BICO technology (p1497 connected) is

activated, the moment of inertia estimator is not active.

● Duration and accuracy of the moment of inertia estimation can be set in the parameters

p1561 and p1562. The following applies:

● If the load changes during acceleration, you must change the 1 signal in parameter p1502

using a BICO switch.

● The estimated moment of inertia can be monitored in parameter r1493.

Supplementary functions for vector control

The "Moment of inertia precontrol" function can only be applied in the vector control mode.

● The "Moment of inertia estimator" function module is activated.

Drive functions

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

The lower the values in both parameters, ...

The higher the values in both parameters, ...

9.12 Moment of inertia estimator

the shorter the moment of inertia estimator meas‐

urements. As a consequence, a quickly chang‐

ing torque can be better estimated.

the more precise the values supplied by the mo‐

ment of inertia estimator.

Function modules