Function modules
8.12 Moment of inertia estimator
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
589
For a horizontal conveyor, in a first approximation, the moment of inertia depends on the
load.
The relationship between load torque and torque is saved in the converter as linear
characteristic.
Figure 8-32 Moment of inertia precontrol
● In the positive direction of rotation:
Moment of inertia J = p5312 · load torque M
L
+ p5313
● In the negative direction of rotation:
Moment of inertia J = p5314 · load torque M
L
+ p5315
You have the following options to determine the characteristic:
● You already know the characteristic from other measurements. In this case, you must set
the parameters to known values when commissioning the system.
● The converter iteratively determines the characteristic by performing measurements while
the motor is operational.
Additional supplementary functions for vector control
● Accelerated moment of inertia estimation (p1400.24 = 1)
Using this setting, when the drive accelerates steadily, the moment of inertia can be more
quickly estimated.
● Speed controller adaptation (p5271.2 = 1)
The estimated load moment of inertia is taken into account for the speed controller gain.
Function diagrams and parameters
Function diagrams (see SINAMICS S120/S150 List Manual)
5035
- moment of inertia estimator (r0108.10 = 1)
6035
- moment of inertia estimator (r0108.10 = 1)
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