7.20.3.5 Friction characteristic
Function
In many applications, e.g. applications with geared motors or belt conveyors, the friction torque
of the load is not negligible.
The converter provides the possibility of precontrolling the torque setpoint, bypassing the
speed controller with the friction torque. The precontrol reduces overshooting of the speed
after speed changes.
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The converter calculates the current friction torque from a friction characteristic with 10
intermediate points.
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The intermediate points of the friction characteristic are dened for positive speeds. In the
negative direction of rotation, the converter uses the intermediate points with a negative
sign.
Recording a friction characteristic
After quick commissioning, the converter sets the speeds of the intermediate points to values
suitable for the rated speed of the motor. The friction torque of all intermediate points is still
equal to zero. On request, the converter records the friction characteristic: The converter
accelerates the motor step by step up to the rated speed, measures the friction torque and writes
the friction torque into the intermediate points of the friction characteristic.
Precondition
The motor is permitted to accelerate up to the rated speed without endangering persons or
property.
Advanced commissioning
7.20Motor control
SINAMICS G115D Wall Mounted distributed drive
Operating Instructions, 07/2023, FW V4.7 SP14, A5E52808211A AA 297
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