Efficiency Optimization - Siemens SINAMICS S120 Function Manual

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Efficiency optimization

The following can be achieved when optimizing the efficiency using p1580:

● Lower motor losses in the partial load range

● Noise in the motor is minimized

It only makes sense to activate this function if the dynamic response requirements of the

speed controller are low (e.g. pump and fan applications).

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 linearly increases with the load and at approx. r0077 =

r0331 × p1570 reaches the setpoint set in p1570.

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.

Function diagrams (see SINAMICS S120/S150 List Manual)

• 6722 Field weakening characteristic, Id setpoint (ASM, p0300 = 1)

• 6723 Field weakening controller, flux controller for induction motor (p0300 = 1)

Overview of important parameters (see SINAMICS S120/S150 List Manual)

Drive functions

Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3

Efficiency optimization

CO: Torque-generating current setpoint

Actual motor magnetizing current / short-circuit current

CO: Flux setpoint

Efficiency optimization

Vector control

4.15 Efficiency optimization