Setting functions
8.5 Motor control
SIMATIC ET 200pro FC-2 converter
116 Operating Instructions, 04/2015, FW V4.7.3, A5E34257324B AB
Characteristics of U/f control
The inverter has different V/f characteristics.
The voltage boost of the characteristic optimizes the speed control at low speeds
With the flux current control (FCC), the inverter compensates for the voltage drop in the stator
Figure 8-12 Characteristics of U/f control
The inverter increases its output voltage to the maximum possible output voltage. The
maximum possible output voltage of the inverter depends on the line voltage.
When the maximum output voltage is reached, the inverter only increases the output
frequency. At this point, the motor enters the field weakening range: At constant torque, the
slip decreases quadratically as the speed increases.
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