Optimizing Motor Starting Using Standard Drive Control - Siemens SINAMICS G120C Operating Instructions Manual

Advanced commissioning
8.20 Motor control
8.20.2.4

Optimizing motor starting using Standard Drive Control

Overview
After selecting application class Standard Drive Control, in most applications no additional
settings need to be made.
At standstill, the converter 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.
Requirement
The ramp-up time of the ramp-function generator is, depending on the motor rated power, 1 s
(< 1 kW) ... 10 s (> 10 kW).
Function description
Starting current (boost) after selecting the application class Standard Drive Control
Figure 8-51
The converter boosts the voltage corresponding to the starting currents p1310 ... p1312.
Increase parameter values p1310 ... p1312 in steps of ≤ 5 %. Excessively high values in
p1310 ... p1312 can cause the motor to overheat and switch off (trip) the converter due to
overcurrent.
If message A07409 appears, it is not permissible that you further increase the value of any of
the parameters.
308
The resulting voltage boost using a linear characteristic as example
Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK
SINAMICS G120C Converters