Siemens SINAMICS G120 Operating Instructions Manual page 349

We recommend that you set method 2.
Figure 6-58
Based on its thermal motor model, the inverter continually determines - for the actual operating
point of the motor - the interdependency between efficiency and flux. The inverter then sets
the flux to achieve the optimum efficiency.
Figure 6-59
Depending on the motor operating point, the inverter either decreases or increases the flux in
partial load operation of the motor.
The inverter calculates the parameters for the thermal motor model based on the motor data
that has been set – and the motor data identification.
Parameter
p1401
p1570
p3315
p3316
Converter with the CU230P-2 Control Units
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE
Determining the optimum flux from the motor thermal model
Qualitative result of efficiency optimization, method 2
Description
Flux control configuration
.14 1 signal: Efficiency optimization 2 active
Flux setpoint (factory setting: 100%)
Efficiency optimization 2 minimum flux limit value (factory setting: 50%)
Minimum limit value for the calculated optimal flux
Efficiency optimization 2 maximum flux limit value (factory setting: 110%)
Maximum limit value for the calculated optimal flux
Advanced commissioning
6.35 Efficiency optimization
349