Siemens SINAMICS G120C USS/MB - Page 265

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Figure 6-49 The resulting voltage boost using a linear characteristic as example
The inverter boosts the voltage corresponding to the starting currents p1310 … p1312.
Parameter Description
p1310 Starting current (voltage boost) permanent (factory setting 50%)
Compensates for voltage drops caused by long motor cables and the ohmic losses in
the motor.
p1311 Starting current (voltage boost) when accelerating (factory setting 0%)
Provides additional torque when the motor accelerates.
p1312 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").
You will find more information on this function in the parameter list and in function diagram
6301 in the List Manual.
After selecting application class Standard Drive Control, in most applications no additional
settings need 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 circumstances, the motor cannot accelerate to its speed setpoint after it has
been switched on:
● Load moment of inertia too high
● Load torque too large
● Ramp-up time p1120 too short
The current can be increased at low speeds to improve the starting behavior of the motor.
Advanced commissioning
6.19 Motor control
SINAMICS G120C converter
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF 265