Siemens SINAMICS G115D Operating Instructions Manual page 338

Advanced commissioning
7.28 Efficiency optimization
Based on its thermal motor model, the converter continually determines - for the actual
operating point of the motor - the interdependency between efficiency and flux. The
converter then sets the flux to achieve the optimum efficiency.
Depending on the motor operating point, the converter either decreases or increases the flux
in partial load operation of the motor.
Efficiency optimization, method 1
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 converter reduces the flux
setpoint linearly with the torque.
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SINAMICS G115D Wall Mounted distributed drive
Operating Instructions, 07/2023, FW V4.7 SP14, A5E52808211A AA