Siemens SINAMICS G120C Operating Instructions Manual page 203

Parameter
p1310
p1311
p1312
You will find more information on this function in the parameter list and in function diagram
6301 in the List Manual.
Starting current (boost) after selecting the application class Standard Drive Control
After selecting application class Standard Drive Control, in most applications, and no
additional settings have to be made.
At standstill, the inverter ensures that at least the rated motor magnetizing current flows.
Magnetizing current p0320 approximately corresponds to the no-load current at
50 % ... 80 % of the rated motor speed.
In the following situations, after it has been switched on, the motor cannot accelerate up to
its speed setpoint:
● Excessively high load moment of inertia
● Excessively high load torque
● Ramp-up time p1120
The current can be increased at low
speeds to improve the starting behavior
of the motor.
The inverter boosts the voltage corre-
sponding to the starting currents
p1310 ... p1312.
The adjacent diagram shows the voltage
boost using a linear characteristic as
example.
SINAMICS G120C converter
Operating Instructions, 07/2015, FW V4.7 SP3, A5E34263257B AC
Description
Starting current (voltage boost) permanent (factory setting 50 %)
Compensates for voltage drops caused by long motor cables and the ohmic losses in
the motor.
Starting current (voltage boost) when accelerating (factory setting 0 %)
Provides additional torque when the motor accelerates.
Starting current (voltage boost) when starting (factory setting 0 %)
Provides additional torque, however, only when the motor accelerates for the first time
after it has been switched on ("break loose torque").
Advanced commissioning
6.5 Motor control
199