Technology Function Friction Characteristic - Siemens SINAMICS S120 Function Manual

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Technology function friction characteristic

Function description

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

driven machine. A friction characteristic enables the speed controller to be precontrolled and

improves the response.

Ten interpolation points are used for each friction characteristic curve. The coordinates of every

interpolation point are defined by a speed parameter (p382x) and a torque parameter (p383x)

(point 1 = p3820 and p3830).

● Ten interpolation points are available for mapping the friction characteristic curve.

● An automatic function allows you to record the friction characteristic curve (record friction

characteristic curve).

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

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

Configuring the function via parameters

In p382x, speeds for the measurement are predefined as a function of the maximum speed

p1082 during first commissioning. They can be changed appropriately.

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:

When the friction characteristic is plotted, the drive can cause the motor to move. As a result,

the motor may reach maximum speed.

Unplanned motor motion while recording the friction characteristic

Motor movement caused when plotting the friction characteristic can result in death, severe

injury or material damage.

● Ensure that nobody is in the danger zone and that the mechanical parts can move freely.

Drive functions

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

Friction characteristic plot deactivated

Friction characteristic record activates direction of rotation all

Note: The friction characteristic curve is recorded in both directions of rotation. The

results of the positive and negative measurement are averaged and entered in p383x.

Friction characteristic plot activated, positive direction of rotation

Friction characteristic plot activated, negative direction of rotation

8.16 Technology function friction characteristic

Basic functions