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In the U/f control variant, "flux current control (FCC)," the inverter controls the motor current (starting
current) at low speeds
Figure 6-39 Simplified function diagram of the U/f control
One function not shown in the simplified function diagram is the resonance damping for
damping mechanical oscillations. You will find the complete function diagrams 6300 et seq. in
the List Manual.
For operation of the motor with U/f control, you must set at least the subfunctions shown with
a gray background in the figure to adapt them to your application:
● V/f characteristic
● Voltage boost
Default setting after selecting the application class Standard Drive Control
Selecting application class Standard Drive Control in the quick commissioning adapts the
structure and the setting options of the U/f control as follows:
● Starting current closed-loop control: At low speeds, a controlled motor current reduces the
tendency of the motor to oscillate.
● With increasing speed, transition from closed-loop starting current control into U/f control
with voltage boost depending on the load.
● The slip compensation is activated.
● Soft starting is not possible.
● Fewer parameters
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Figure 6-40 Default setting of the U/f control after selecting Standard Drive Control
The complete function diagrams 6850 ff. for application class Standard Drive Control are
provided in the List Manual.
Advanced commissioning
6.24 Motor control
Converter with the CU230P-2 Control Units
298 Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE
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