Fc 300 Controls - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide

FC 300 Controls

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The adjustable frequency drive is capable of controlling either the speed or the torque on the
motor shaft. Setting par. 1-00 determines the type of control.
Speed control:
There are two types of speed control:
Speed open loop control which does not require any feedback.
•
Speed closed-loop control in the form of a PID control that requires a speed feedback to an input. A
•
properly optimized speed closed-loop control will have higher accuracy than a speed open loop control.
Selects which terminal to use as speed PID feedback in par. 7-00.
Torque control:
Torque control is part of the motor control and correct settings of motor parameters are very
important. The accuracy and settling time of the torque control are determined from Flux
with motor feedback (par. 1-01 Motor Control Principle).
• Flux sensorless offers superior performance in all four quadrants at motor frequencies above 10 Hz.
Flux with encoder feedback offers superior performance in all four quadrants and at all motor speeds.
•
The "Flux with encoder feedb" mode requires that an encoder speed feedback signal is
present. Select which terminal to use in par. 1-02.
Speed / torque reference:
The reference to these controls can either be a single reference or the sum of various references including
relatively scaled references. The handling of references is explained in detail later in this section.
Introduction to FC 300
MG.33.B3.22 - VLT is a registered Danfoss trademark
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