Efficiency Optimization - Siemens Sinamics G120P Operating Instructions Manual

Functions
7.7 Application-specific functions
7.7.5

Efficiency optimization

The following can be achieved when optimizing efficiency using p1580:
● Lower motor losses in the partial load range
● Minimization of noise in the motor
Figure 7-19
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 increases linearly with the load and, reaching the setpoint set in
p1570 at approx. r0077 = r0331 x 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.
Table 7- 30
Parame-
ters
p1570
p1580
p1582
For more information, refer to the parameter descriptions and the function block diagrams
6722 and 6723 of the List Manual.
386
Efficiency optimization
Parameters
Description
Flux setpoint (Factory setting: 103 %)
Efficiency optimization (Factory setting: 100 %)
Flux setpoint smoothing time (Factory setting: 15 ms)
Inverter cabinet units
Operating Instructions, 12/2014, A5E32923362A