Siemens Sinamics S120 Function Manual page 218

U/f control (vector control)
Several variations of the U/f characteristic exist, which are shown in the following table:
Table 5- 1 U/f characteristic (p1300)
Parameter Meaning
values
0 Linear characteristic
1 Linear characteristic
with flux current control
(FCC)
2 Parabolic characteristic Characteristic that takes into account
216
Standard (w/o voltage boost)
Characteristic that compensates for
voltage losses in the stator resistance
for static / dynamic loads (flux current
control FCC).
This is particularly useful for small
motors, since they have a relatively
high stator resistance.
the motor torque curve (e.g. fan/pump).
a) Quadratic characteristic (f
characteristic)
b) Energy saving because the low
voltage also results in small currents
and drops.
Application / property
2
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
Drive functions