Siemens SINAMICS G120 Operating Instructions Manual page 174

Functions
7.6 Motor control
Note
Only increase the voltage boost in small steps until satisfactory motor behavior is reached.
Excessively high values in p1310 ... p1312 can cause the motor to overheat and switch off
(trip) the inverter due to overcurrent .
Table 7- 25
Parameter Description
P1310
P1311
P1312
You will find more information about this function in the parameter list and in function
diagram 6300 of the List Manual.
172
Optimizing the starting characteristics for a linear characteristic
Permanent voltage boost (factory setting 50 %)
The voltage boost is active from standstill up to the rated speed.
It is at its highest at speed 0 and continually decreases as the speed increases.
Value of voltage boost at zero speed in V:
1.732 × rated motor current (p0305) × stator resistance (r0395) × p1310 / 100 %.
Voltage boost on acceleration
The voltage boost on acceleration is independent of speed and occurs when the setpoint
is increased. It disappears as soon as the setpoint is reached.
Value in V: 1.732 × rated motor current (p0305) × stator resistance (r0395) x p1311 /
100 %
Voltage boost at start up
The voltage boost at start-up results in an additional voltage boost when accelerating,
but only the first time the motor accelerates after it has been switched on.
The voltage boost in V is: 1.732 x rated motor current (p0305) × stator resistance (r0395)
x p1312 / 100%
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB