Siemens SINAMICS S150 NEMA, Operating Instructions Manual, Page: 516 / 862

Functions, monitoring and protective functions
9.3 Drive functions
Enclosed Drives
514
Operating Instructions, 12/2018, A5E36652151A
9.3.2.2 Simple efficiency optimization (method 1)
For p1580 = 100%, the flux in the motor under no-load operating conditions is reduced to
half of the setpoint (reference) flux (p1570/2). As soon as a load is connected to the drive,
the setpoint (reference) flux increases linearly with the load and reaches the setpoint set in
p1570 at approx. r0077 = r0331 x p1570.
Figure 9-3 Efficiency optimization
In the field-weakening range, the final value is reduced by the actual degree of field
weakening. The smoothing time (p1582) should be set to approx. 100 ms to 200 ms. Flux
differentiation (see also p1401.1) is automatically deactivated internally following
magnetization.
Figure 9-4 Basic efficiency optimization