Friction Characteristic - Siemens Sinamics G110M Operating Instructions Manual

Advanced commissioning
6.17 Motor control
● When opening the motor holding brake, enter a speed setpoint > 0.
For speed setpoint = 0, and with the motor holding brake open, the load drops because
the induction motor rotates with the slip frequency as a result of the pulling load.
● Set the ramp-up and ramp-down times ≤ 10 s in the ramp-function generator.
● If, in quick commissioning, you have selected application class Dynamic Drive Control
then set p0502 = 1 (technological application: dynamic starting or reversing).
6.17.2.4

Friction characteristic

Function
In many applications, e.g. applications with geared motors or belt conveyors, the frictional
torque of the load is not negligible.
The inverter provides the possibility of precontrolling the torque setpoint, bypassing the
speed controller. The precontrol reduces overshooting of the speed after speed changes.
Figure 6-51
The inverter calculates the current frictional torque from a friction characteristic with 10
intermediate points.
Figure 6-52
The intermediate points of the friction characteristic are defined for positive speeds. In the
negative direction of rotation, the inverter uses the intermediate points with a negative sign.
244
Par. Explanation
p1610 Static torque setpoint (encoderless) (Factory setting: 50 %)
Set a value which is higher than the maximum load torque that occurs.
Precontrol of the speed controller with frictional torque
Friction characteristic
Distributed converter for SIMOGEAR geared motors
Operating Instructions, 09/2017, FW V4.7.9, A5E31298649B AH