Siemens SINAMICS G150 Operating Instructions Manual page 433

Voltage boost during acceleration (p1311)
The voltage boost is only effective for one acceleration operation and only until the setpoint
is reached.
Voltage boost is only effective if the signal "ramp-up active" (r1199.0 = 1) is present.
You can use parameter r0056.6 to observe whether the voltage boost is active during
acceleration.
Figure 7-8
Voltage boost at startup (p1312)
The voltage boost is only effective for the first acceleration operation after pulse enable and
only until the setpoint is reached.
Voltage boost is only effective if the signal "ramp-up active" (r1199.0 = 1) is present.
You can use parameter r0056.5 to observe whether the voltage boost is active at startup.
Function diagram
FP 6300
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A
Voltage boost during acceleration (example: p1300 = 0, p1310 = 0, p1311 > 0)
V/f characteristic and voltage boost
Setpoint channel and closed-loop control
7.3 V/f control
433