Siemens Sinamics G110M Operating Instructions Manual page 245

Recording a friction characteristic
After quick commissioning, the inverter 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 inverter records the friction characteristic: The inverter
accelerates the motor step by step up to the rated speed, measures the frictional torque und
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
To record the friction characteristic, proceed as follows:
1. Set P3845 = 1: The inverter 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 inverter accelerates the motor.
During measurement, the inverter signals the alarm A07961.
When the inverter has determined all the intermediate points of the friction characteristic
without fault code F07963, the inverter 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 inverter adds the output of the friction
characteristic r3841 to the torque setpoint.
Parameter
Parameter
p3820 ...
p2839
r3840
r3841
p3842
Distributed converter for SIMOGEAR geared motors
Operating Instructions, 09/2017, FW V4.7.9, A5E31298649B AH
Explanation
Intermediate points of the friction characteristic [rpm; Nm]
Friction characteristic status word
.00 1 signal: Friction characteristic OK
.01 1 signal: Determination of the friction characteristic is active
.02 1 signal: Determination of the friction characteristic is complete
.03 1 signal: Determination of the friction characteristic has been aborted
.08 1 signal: Friction characteristic positive direction
Friction characteristic, output [Nm]
Activate friction characteristic
0: Friction characteristic deactivated
1: Friction characteristic activated
Advanced commissioning
6.17 Motor control
245