Fc 300 Controls - Danfoss FC 300 Design Manual

FC 300 Design Guide
The motor is supplied with variable voltage / current and frequency, which enables infinitely variable speed
control of three-phased, standard AC motors and permanent magnet synchronous motors.

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 (sensorless).
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Speed closed-loop control in the form of PID control that requires speed feedback to an input. Properly
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optimized speed closed-loop control will have higher accuracy than speed open loop control.
Selects which input to use as speed PID feedback in par. 7-00.
Torque control (FC 302 only):
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 w motor feedb (par. 1-01 Motor Control Principle).
Flux sensorless offers superior performance in all four quadrants at motor frequencies above 10 Hz.
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Flux with encoder feedback offers superior performance in all four quadrants and at all motor speeds.
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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.B6.22 - VLT is a registered Danfoss trademark
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