Characteristics Of U/F Control - Siemens sinamics G120 Operating Instructions Manual

Low voltage inverters chassis devices with cu250s-2 control units and encoder evaluation

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Characteristics of U/f control

The inverter has different V/f characteristics.

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.

Converter with CU250S-2 Control Unit

Operating Instructions, 01/2016, FW V4.7 SP6, A5E31759476B AE

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

resistor of the motor

Characteristics of V/f control

Advanced commissioning

6.5 Motor control