Siemens SINAMICS G120C USS/MB Operating Instructions Manual page 313

Efficiency optimization, method 1
Figure 6-69
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 6-70
The reduced flux in the motor partial load range results in higher efficiency.
Parameter
p1570
p1580
SINAMICS G120C converter
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF
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.
Advanced commissioning
6.29 Efficiency optimization
313