Characteristics Of U/F Control - Siemens SIMATIC ET 200pro Series Operating Instructions Manual
Low voltage converter for the distributed i/o system
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Also See for SIMATIC ET 200pro Series:
- Operating instructions manual (545 pages) ,
- Quick manual (260 pages) ,
- Original instructions manual (256 pages)
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Advanced commissioning
7.11 Motor control
7.11.1.1
Characteristics of U/f control
The inverter has different V/f characteristics.
①
②
Figure 7-25
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.
142
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
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257324B AE
SIMATIC ET 200pro FC-2 converter
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