Siemens SINAMICS G220 - Page 496

• Line impedance
• Actual motor torque
The maximum possible output voltage as a function of the input voltage is provided in the
technical data.
The converter has di󹪜erent U/f characteristics.
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① The voltage boost of the characteristics improves speed control at low speeds
② When the 󹪞ux current control (FCC) is used, the converter compensates for the voltage drop in the
stator resistance of the motor
③ In the ECO mode, the converter optimizes the motor e󹪟ciency in steady-state operation. The
optimization is only e󹪜ective when the ramp-function generator is not bypassed.
④ For settings 5 and 6, the converter keeps the output frequency constant:
• Slip compensation is inhibited
• When reaching the current limit, the I_max controller only reduces the motor voltage but not
the output frequency.
Figure14-105 Characteristics of U/f control
Functions
14.10Closed-loop drive control
SINAMICS G220 converter
494 Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB