Voltage Boost - Siemens SINAMICS S120 Function Manual

Parameter Meaning
values
5 Precise frequency
drives
6 Precise frequency
drives with flux current
control (FCC)
19 Independent voltage
setpoint
5.2

Voltage boost

With an output frequency of 0 Hz, the V/f characteristics yield an output voltage of 0 V. The
voltage boost must be entered to:
● Magnetize the induction motor.
● Maintain the load.
● Compensate for the losses (ohmic losses in the winding resistors) in the system
● Generate a breakaway/acceleration/braking torque.
The voltage boost can be increased permanently (p1310) or during acceleration (p1311).
Figure 5-2
Drive Functions
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
Characteristic that takes into account the technological particularity of an
application (e.g. textile applications):
a) whereby the current limitation (Imax controller) only affects the output voltage
and not the output frequency, or
b) by disabling slip compensation
Characteristic that takes into account the technological particularity of an
application (e.g. textile applications):
a) whereby the current limitation (Imax controller) only affects the output voltage
and not the output frequency, or
b) by disabling slip compensation
Voltage losses in the stator resistance for static / dynamic loads are also
compensated (flux current control FCC). This is particularly useful for small
motors, since they have a relatively high stator resistance.
The user can define the output voltage of the Motor Module independently of the
frequency using BICO parameter p1330 via the interfaces (e.g. analog input AI0
of Terminal Board 30 –> p1330 = r4055[0]).
Voltage boost total
Vector V/f control (r0108.2 = 0)
Application / property
5.2 Voltage boost
171