Siemens SIMATIC ET 200pro Series Operating Instructions Manual page 173

Efficiency optimization, method 2
Generally, energy efficiency optimization method 2 achieves a better efficiency than
method 1.
We recommend that you set method 2.
Figure 7-36
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 7-37
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
SIMATIC ET 200pro FC-2 converter
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257324B 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
7.18 Efficiency optimization
173