Siemens SINAMICS S120, Function Manual

Page: 264 / 1094

Vector control
5.15 Efficiency optimization
Drive functions
264
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
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 load is connected to the drive, the
setpoint (reference) flux increases linearly with the load and, reaching the setpoint set in
p1570 at approx. r0077 = r0331 · p1570.
Figure 5-21 Efficiency tuning
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 to 200 ms. Flux
differentiation (see also p1401.1) is automatically deactivated internally following
magnetization.
Figure 5-22 Basic efficiency optimization