Siemens SINAMICS G150 - Friction Characteristic Curve

Functions, monitoring, and protective functions
9.2 Drive functions
Converter cabinet units
504 Operating Instructions, 07/2016, A5E03347396A
9.2.8
Friction characteristic curve
Description
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).
Features
● 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:
•
p3845 = 0
Friction characteristic plot deactivated
•
p3845 = 1
Friction characteristic plot activated, all directions
The friction characteristic is plotted in both directions of rotation. The r
e-
sult of the positive and negative measurement is averaged and entered
into p383x.
•
p3845 = 2
Friction characteristic plot activated, positive direction
•
p3845 = 3
Friction charac
teristic plot activated, negative direction
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
speed.