Moment Of Inertia Estimator - Siemens SINAMICS G220 Operating Instructions Manual

14.10.9

Moment of inertia estimator

Overview
The moment of inertia estimator continuously corrects the value of the load moment of inertia
for the closed-loop control. In this way, the moment of inertia estimator minimizes overshoots
after speed changes.
The more precise the value of the moment of inertia in the converter, the lower the
overshoot after speed changes.
Figure 14-153
Description of function
The converter calculates the total moment of inertia of the load and motor. The calculation
comprises the following components:
• Actual speed
• Actual motor torque
• Friction torque of the load
Figure 14-154
When using the moment of inertia estimator, we recommend that you also activate the
friction characteristic.
SINAMICS G220 converter
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB
Influence of the moment of inertia on the speed
Overview of the function of the moment of inertia estimator
Functions
14.10 Closed-loop drive control
557