Siemens SINAMICS G120C USS/MB - Page 313

Efficiency optimization, method 1
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Figure 6-69 Reduce the flux setpoint in the partial load range of the motor
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.
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Figure 6-70 Qualitative result of efficiency optimization, method 1
The reduced flux in the motor partial load range results in higher efficiency.
Parameter Description
p1570 Flux setpoint (factory setting: 100%)
p1580 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
SINAMICS G120C converter
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF 313