Friction Characteristic Curve - Siemens SINAMICS S150 NEMA Operating Instructions Manual

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Friction characteristic curve

The friction characteristic is used to compensate for the frictional torque of the motor and

driven load. A friction characteristic allows the speed controller to be pre-controlled and

improves the control response..

10 points along the characteristic are used for the friction characteristic. The coordinates of

every interpolation point are defined by a speed parameter (p382x) and a torque parameter

(p383x) (point 1 = p3820 and p3830, point 10 = p3829 and p3839).

● There are 10 points along the characteristic to represent the friction characteristic.

● An automatic function supports the friction characteristic plot.

● A connector output (r3841) can be interconnected as friction torque (p1569).

● The friction characteristic can be activated and deactivated (p3842).

Commissioning

Speeds for making measurements as a function of the maximum speed p1082 are pre-

assigned in p382x when commissioning the drive system for the first time. These can be

appropriately changed corresponding to the actual requirements.

The automatic friction characteristic plot can be activated using p3845. The characteristic is

then plotted the next time that it is enabled.

The following settings are possible:

p3847 (friction characteristic plot warm-up period) can be used to set a time for the drive to

warm up to the specified operating temperature. During this time, the drive is brought up to

and kept at the greatest speed set for plotting the friction characteristic, so that the drive

warms up to the operating temperature. Then measurement is started with the highest

Enclosed Drives

Operating Instructions, 12/2018, A5E36652151A

Friction characteristic plot deactivated

Friction characteristic plot activated, all directions

  T he friction characteristic is plotted in both directions of rotation. The

result of the positive and negative measurement is averaged and entered

Friction characteristic plot activated, positive direction

Friction characteristic plot activated, negative direction

Functions, monitoring and protective functions

9.3 Drive functions