Characteristics Of U/F Control - Siemens SINAMICS G115D Operating Instructions Manual
Distributed drive for conveyor technology control
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Also See for SINAMICS G115D:
- Operating instructions manual (522 pages) ,
- Operating instructions manual (600 pages)
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Advanced commissioning
6.18 Motor control
6.18.1.1
Characteristics of U/f control
The converter has different U/f characteristics.
①
②
The converter increases its output voltage to the maximum possible output voltage. The
maximum possible output voltage of the converter depends on the line voltage.
When the maximum output voltage is reached, the converter 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.
The value of the output voltage at the rated motor frequency also depends on the following
variables:
• Ratio between the converter size and the motor size
• Line voltage
• Line impedance
• Actual motor torque
The maximum possible output voltage as a function of the input voltage is provided in the
technical data.
256
The voltage boost of the characteristic optimizes the speed control at low speeds
With the flux current control (FCC), the converter compensates for the voltage drop in the stator
resistor of the motor
Technical data (Page 359)
Operating Instructions, 12/2020, FW V4.7 SP13, A5E48681219B-002
SINAMICS G115D distributed drive
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