Siemens SINAMICS G120 Operating Instructions Manual page 350

Advanced commissioning
6.35 Efficiency optimization
Efficiency optimization, method 1
Figure 6-60
The motor operates in partial load mode between no-load operation and the rated motor torque.
Depending on p1580, in the partial load range, the inverter reduces the flux setpoint linearly
with the torque.
Figure 6-61
The reduced flux in the motor partial load range results in higher efficiency.
Parameter
p1570
p1580
350
Reduce the flux setpoint in the partial load range of the motor
Qualitative result of efficiency optimization, method 1
Description
Flux setpoint (factory setting: 100%)
Efficiency optimization (factory setting depends on the inverter)
0% Efficiency optimization is deactivated.
100% In no-load operation, the inverter reduces the flux setpoint to 50% of the rated
motor flux.
Converter with the CU230P-2 Control Units
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE