Danfoss VLT AutomationDrive FC 360 Design Manual page 87

Design Guide | VLT® AutomationDrive FC 360
Figure 45: Clamping of Reference Input with Limits outside -Maximum to +Maximum
Control Structures
8.3.3
Control Principle
8.3.3.1
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.
Control Modes
8.3.3.2
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:
Speed open-loop control, which does not require any feedback from the motor (sensorless).
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Speed closed-loop PID control, which requires a speed feedback to an input. A properly optimized speed closed-loop control has
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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
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