Design Guide | VLT® AutomationDrive FC 360
Figure 45: Clamping of Reference Input with Limits outside -Maximum to +Maximum
8.3.3 Control Structures
8.3.3.1 Control Principle
A drive rectifies AC voltage from mains into DC voltage. Then the DC voltage is converted into an AC current with a variable amplitude
and frequency.
The motor is supplied with variable voltage/current and frequency, enabling variable speed control of 3-phased standard AC motors and
permanent magnet synchronous motors.
8.3.3.2 Control Modes
The drive is capable of controlling either the speed or the torque on the motor shaft. Setting parameter 1-00 Configuration Mode
determines the type of control.
Speed control
There are 2 types of speed control:
l Speed open-loop control, which does not require any feedback from the motor (sensorless).
l Speed closed-loop PID control, which requires a speed feedback to an input. A properly optimized speed closed-loop control has
higher accuracy than a speed open-loop control.
Select which input to use as speed PID feedback in parameter 7-00 Speed PID Feedback Source.
Torque control
Danfoss A/S © 2024.01 AJ435824192086en-000101 / 130R1295 | 85
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