Advanced commissioning
6.5 Motor control
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2016, FW V4.7 SP6, A5E34259001B AC
239
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
Image 6-32 Characteristics of V/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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