Siemens SINAMICS S120, Function Manual

Page: 299 / 1094

V/f control (vector control)
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
299
Parameter
values
Meaning Application / property
3 Programmable char-
acteristic
Characteristic that takes into account
motor/machine torque curve (e.g. syn-
chronous motor).
4 Linear characteristic
and ECO
Characteristic, see parameter 0 and Eco mode at a constant operating point.
•
In the ECO mode, the efficiency at a constant operating point is optimized. This
optimization is only effective in steady-state operation and when the ramp-function
generator is not bypassed.
•
You must activate slip compensation and set the scaling of the slip compensation
(p1335) so that the slip is completely compensated (generally, 100%).
5 Precise frequency
drives
Characteristic that takes into account the technological particularity of an application
(e.g. textile applications):
• Whereby the current limitation (Imax controller) only affects the output voltage and
not the output frequency
•
By disabling slip compensation
6 Precise frequency
drives with flux cur-
rent control (FCC)
Characteristic that takes into account the technological particularity of an application
(e.g. textile applications):
•
Whereby the current limitation (Imax controller) only affects the output voltage and
not the output frequency
• By disabling slip compensation
Voltage losses in the stator resistance for static/dynamic loads are also compensated
(flux current control FCC). This function is required for small motors, as, in comparison
to large motors, they have a relatively high stator resistance.
7 Parabolic characteris-
tic and ECO
Characteristic, see parameter 1 and ECO mode at a constant operating point.
•
In the Eco mode, the efficiency at a constant operating point is optimized. This
optimization is only effective in steady-state operation and when the ramp-function
generator is not bypassed.
•
You must activate slip compensation and set the scaling of the slip compensation
(p1335) so that the slip is completely compensated (generally, 100%).
19 Independent voltage
setpoint
The user can define the output voltage of the Motor Module independently of the fre-
quency using BICO parameter p1330 via the interfaces (e.g. analog input AI0 of Ter-
minal Board 30 –> p1330 = r4055[0]).