Siemens SINAMICS G150 Operating Instructions Manual page 572

Functions, monitoring, and protective functions
9.3 Extended functions
Additional supplementary functions:
● 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.
Commissioning
The "inertia estimator" function module can be activated by running the commissioning
wizard. Parameter r0108.10 indicates whether the function module has been activated.
Activating the moment of inertia estimator
The moment of inertia estimator is deactivated in the factory setting. p1400.18 = 0,
p1400.20 = 0, p1400.22 = 0.
If you performed the rotating measurement for the motor identification during commissioning,
we recommend leaving the moment of inertia estimator deactivated.
Preconditions
● You have selected encoderless vector control.
● The load torque must be constant whilst the motor accelerates or brakes.
Typical of a constant load torque are conveyor applications and centrifuges, for example.
Fan applications, for example, are not permitted.
● The speed setpoint is free from superimposed unwanted signals.
● The motor and load are connected to each other with an interference fit.
Drives with slip between the motor shaft and load are not permitted, e.g. as a result of
loose or worn belts.
If the conditions are not met, you must not activate the moment of inertia estimator.
Procedure
To activate the moment of inertia estimator, proceed as follows:
1. Set p1400.18 = 1
2. Check: p1496 ≠ 0
3. Activate the acceleration model of the speed controller pre-control: p1400.20 = 1.
With p1400.22 = 1, the valued determined by the moment of inertia estimator is retained at a
pulse inhibit.
With p1400.24 = 1, the moment of inertia can be determined in an accelerated manner for
steady acceleration processes.
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Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A