Technology Function: Friction Characteristic - Siemens SINAMICS S120 Function Manual

6.10

Technology function: friction characteristic

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 pre-controlled
and improves the response.
10 interpolation points are used for each friction characteristic curve. The coordinates of an
interpolation point are described by a speed (p382x) and a torque parameter (p383x)
(interpolation point 1 = p3820 and p3830).
Features
● 10 interpolation points are available for mapping the friction characteristic curve.
● An automatic function allows you to record the friction characteristic curve (record friction
● A connector output (r3841) can be applied as friction torque (p1569).
● The friction characteristic can be activated and deactivated (p3842).
Function diagrams (see SINAMICS S List Manual)
● 5610 Torque limiting/reduction/interpolator
● 6710 Current setpoint filters
● 7010 Friction characteristic curve
Overview of key parameters (see SINAMICS S List Manual)
● p3820 Friction characteristic curve value n0
● ...
● p3839 Friction characteristic curve value M9
● r3840 CO/BO: Friction characteristic curve status
● r3841 CO: Friction characteristic curve output
● p3842 Friction characteristic curve activation
● p3845 Friction characteristic curve record activation
Commissioning via parameters
In p382x, speeds for the measurement are predefined as a function of the maximum speed
p1082 during initial 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:
● p3845 = 0 Friction characteristic curve recording deactivated
Drive Functions
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
characteristic curve).
6.10 Technology function: friction characteristic
Basic functions
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