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Functions
14.10 Closed-loop drive control
• 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 different U/f characteristics.
①
②
③
④
Figure 14-105
494
The voltage boost of the characteristics improves speed control at low speeds
When the flux current control (FCC) is used, the converter compensates for the voltage drop in the
stator resistance of the motor
In the ECO mode, the converter optimizes the motor efficiency in steady-state operation. The
optimization is only effective when the ramp-function generator is not bypassed.
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.
Characteristics of U/f control
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB
SINAMICS G220 converter
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