Commissioning - Siemens SINAMICS S120 Function Manual

Drive functions

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Commissioning

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

1. Call the drive configuration offline in STARTER. In the "Configuration" screen form, click

the "Function modules / technology packages" button. In the "Object Properties" dialog

box, activate the "Moment of inertia estimator" function module.

You can check the current configuration in parameter r0108.10.

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

drive object:

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

estimator via p1400.

For servo control, the Online tuning (Page 120)function automatically activates the

"Moment of inertia estimator".

Additional settings and special issues

● Using parameters p1561 and p1562, you define how quickly and/or how precisely the

moment of inertia should be estimated.

– The lower the values in both parameters, the shorter the moment of inertia estimator

– The higher the values in both parameters, the more precise the values supplied by the

● If the speed setpoint changes must be performed under load, then you can freeze the

currently estimated moment of inertia during this time. To do this, in parameter p1502 set

a 1 signal using a BICO switch . For operation with encoder, p1402.4 must also be set =

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

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

activated, the moment of inertia estimator is not active.

Drive functions

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

measurements. As a consequence, a quickly changing torque can be better

moment of inertia estimator.

Function modules

8.12 Moment of inertia estimator

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