Siemens SINAMICS S120 Function Manual page 172

Vector V/f control (r0108.2 = 0)
5.2 Voltage boost
Note
The voltage boost affects all V/f characteristics (p1300).
NOTICE
If the voltage boost value is too high, this can result in a thermal overload of the motor
winding.
Permanent voltage boost (p1310)
Figure 5-3
Voltage boost at acceleration (p1311)
Voltage boost at acceleration is effective if the ramp function generators provide the
feedback signal "ramp-up active" (r1199.0 = 1).
172
Permanent voltage boost (example: p1300 = 0 and p1310 > 0)
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
Drive Functions