Siemens SINAMICS G115D

Parameter Description Setting
p3845 Friction characteristic record acti‐
vation
Setting for the friction characteristic record.
0: Friction characteristic plot deactivated (factory
setting)
1: Friction characteristic plot activated, both direc‐
tions
2: Friction characteristic plot activated, positive di‐
rection
3: Friction characteristic plot activated, negative di‐
rection
p3846[0...n] Friction characteristic record ramp-
up/ramp-down time [s]
Sets the ramp-up/ramp-down time of the ramp-up/
ramp-down function generator to automatically re‐
cord the friction characteristic.
Factory setting: 10
p3847[0...n] Friction characteristic record warm-
up time [s]
Sets the warm-up time.
At the start of automatic plotting, the converter
accelerates the motor up to the speed = p3829 and
keeps the speed constant for this time.
Factory setting: 0
Further information on this topic is provided in the List Manual.
7.20.3.6 Moment of inertia estimator
Background
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 speci󹪝es the main percentage of the torque setpoint. The speed controller corrects
inaccuracies in the precontrol (feed-forward control).
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3
7
1
The more precise the value of the moment of inertia in the converter, the lower the
overshoot after speed changes.
Advanced commissioning
7.20Motor control
SINAMICS G115D Wall Mounted distributed drive
Operating Instructions, 07/2023, FW V4.7 SP14, A5E52808211A AA 299