Moment Of Inertia Estimator - Siemens SINAMICS G120C Operating Instructions Manual
Low voltage converters
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Also See for SINAMICS G120C:
- Operating instructions manual (470 pages) ,
- Compact operating instructions (92 pages) ,
- Getting started (68 pages)
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8.20.3.5
Moment of inertia estimator
Overview
From the load moment of inertia and the speed setpoint change, the converter calculates the
accelerating torque required for the motor. Via the speed controller precontrol, the accelerating
torque specifies the main percentage of the torque setpoint. The speed controller corrects
inaccuracies in the precontrol (feed-forward control).
Figure 8-55
The more precise the value of the moment of inertia in the converter, the lower the
overshoot after speed changes.
Figure 8-56
Function description
The converter calculates the total moment of inertia of the load and motor. The calculation
comprises the following components:
• Current speed
• Actual motor torque
• Reduce the load
SINAMICS G120C Converters
Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK
Influence of the moment of inertia estimator on the speed control
Influence of the moment of inertia on the speed
Advanced commissioning
8.20 Motor control
319
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