FC 300 Design Guide
Introduction to FC 300
The motor is supplied with variable voltage / curre nt and frequency, which enables infinitely variable spe ed
control of three-phased, standard AC motors and permanent magnet synchronous motors.
" 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 loop control which does not require a ny feedback (sensorless).
• Speed closed-loop control in the form of PID control that requires spe ed feedback
to a n input. Properly
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 .
T
orque control (FC 302 only ):
Torque c ontrol is part of the motor control and correct settings of motor paramet
ers are
very important. The accuracy and settling time of the torque control are determined from
Flux w motor feedb (par. 1-0 1 Motor Control Principle).
• Flux sensorless offers superior performance in all four quadrant
s at motor frequencies above 10 Hz.
• Flux with encoder feedback offers superior perform a nc e in all four quadrants and at all m otor speeds.
S
peed / t orque reference:
The reference to the se controls can either be a single reference or the sum of various references including
relatively scaled references. The handling of reference
s is explained in detail later in this section.
17
MG.33.B6.22 - VLT is a registered Danfoss trademark
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