FC 300 Design Guide
Introduction to FC 300
" FC 300 Controls
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.
S
peed control:
There are two types of speed control:
• Speed open lo op control which do es 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.
T
orque control:
Torque co ntrol is part of the motor control and correct settings of motor parameters are very
important. The accuracy and settling time o f the torque control are determine d 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.
S
peed / torque refere nce:
The reference to these controls can either be a single refere nce or th e sum
of various references including
relatively scaled references. T h e handling of references is explained in detail later in this section.
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MG.33.B3.22 - VLT is a registered Danfoss trademark
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