Moment Of Inertia Estimator - Siemens SINAMICS G120D Operating Instructions Manual
Distributed converter, control units with encoder evaluation
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Also See for SINAMICS G120D:
- List manual (910 pages) ,
- Operating instructions manual (398 pages) ,
- Original instructions manual (382 pages)
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Advanced commissioning
6.5 Motor control
6.5.2.6
Moment of inertia estimator
Background
From the load moment of inertia and the speed setpoint change, the inverter 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).
Image 6-30
The more precise the value of the moment of inertia in the inverter, the lower the overshoot
after speed changes.
Image 6-31
Function
From the actual speed, the actual motor torque and the frictional torque of the load, the
inverter calculates the total moment of inertia of the load and motor.
Image 6-32
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Influence of the moment of inertia estimator on the speed control
Influence of the moment of inertia estimator on the speed
Overview of the function of the moment of inertia estimator
Operating Instructions, 07/2016, FW V4.7 SP6, A5E34262100B AD
Converter with control units CU240D-2
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