Siemens SINAMICS S120 Function Manual page 544

Function modules
8.12 Inertia estimator
Commissioning
To activate the "inertia estimator" function module, proceed as follows:
1. Call the drive object configuration offline. In the "Configuration" screen form, click the
"Function modules / technology packages" button. In the "Object Properties" dialog box,
select the "inertia estimator" function module.
2. Make the setting p1400.18 = 1 (inertia estimator active) in the expert list of the drive
object:
A data set changeover can be used to activate or deactivate the inertia estimator via
p1400.
Note
The "Online tuning" function activates the inertia estimator automatically.
If the speed setpoint changes must be performed under load, then freeze the currently
estimated moment of inertia during this time by setting the source to a 1 signal.
If the function for adapting the moment of inertia via BICO technology (p1497 connected) is
activated, the inertia estimator is not active.
The estimated moment of inertia can be monitored in parameter r1493.
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Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
Drive functions