Siemens SINAMICS S120 Function Manual page 159

Table 3-19 V/f characteristic (p1300)
Parameter Meaning
values
0 Linear characteristic
1 Linear characteristic
with flux current con-
trol (FCC)
2 Parabolic
characteristic
3 Programmable
characteristic
© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition
Application / property
Standard (w/o voltage
boost)
Characteristic that
compensates for voltage
drops 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.
Characteristic that takes
into account the motor
torque characteristic
(e.g. fan/pump).
a) Quadratic
characteristic
2
(n characteristic)
b) Energy saving
because the low voltage
also results in small
currents and drops.
Characteristic that takes
into account the motor /
machine torque
characteristic
(e.g. synchronous motor).
Operating Modes
Vector V/f control (r0108.2 = 0)
V
V
n
p1300 = 0
0
V
V
max
r0071
p0304
0
p0310
V
V
n
p1300 = 2
0
V
V max
r0071
p1327
p1325
p1323
p1321
r1315
0
f1 f2 f3
p1320 p1322 p1324
f
f
n
Load current
dependent
f
f
f
n
f
f4 fmax
p1326 p1082
3-159