Siemens SINAMICS G110M - Page 304

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Figure 8-57 Friction characteristic
The intermediate points of the friction characteristic are de󹪝ned for positive speeds. In the
negative direction of rotation, the converter uses the intermediate points with a negative sign.
Function description
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 frictional 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 frictional torque and
writes the frictional torque into the intermediate points of the friction characteristic.
Requirement
The motor is permitted to accelerate up to the rated speed without endangering persons or
property.
Procedure
1. Set P3845 = 1: The converter accelerates the motor successively in both directions of rotation
and averages the measurement results of the positive and negative directions.
2. Switch on the motor (ON/OFF1 = 1).
3. The converter accelerates the motor.
During measurement, the converter signals the alarm A07961.
When the converter has determined all the intermediate points of the friction characteristic
without fault code F07963, the converter stops the motor.
You have recorded the friction characteristic.
❒
Adding friction characteristic for the torque setpoint
If you enable the friction characteristic (p3842 = 1), the converter adds the output of the friction
characteristic r3841 to the torque setpoint.
Parameter
Parameter Description Factory setting
p3820[D] Friction characteristic, value n0 15 rpm
p3821[D] Friction characteristic, value n1 30 rpm
p3822[D] Friction characteristic, value n2 60 rpm
p3823[D] Friction characteristic, value n3 120 rpm
Advanced commissioning
8.19 Motor control
Distributed converter for SIMOGEAR geared motors
302 Operating Instructions, 10/2020, FW V4.7 SP13, A5E31298649B AL