FC 300 Design Guide
Introduction to FC 300
" FC 301 vs. FC 302 Control Principle
The FC 301 is a general-purpose adjustable frequency drive for variable speed applications. The
control principle is based on voltage vector control (VVC
plus
).
The FC 301 can handle asynchronous motors only.
The current sensing principle in the FC 301 is based on current measurement in the DC link
or motor phase. T he ground fault protection on the motor side is solved by a de-saturation
circuit in the IGBTs connected to the control board.
Short circuit behavior in the FC 301 depends on the current transducer with positive DC link and the
desaturation protection with feedback from th e 3 lower IGBTs and the brake.
The FC 302 is a high-performanc e adjustable frequenc y drive for demanding applications. The
adjustable frequency drive can handle various kinds of motor control principles such as U/f
special motor mode, VVCplus or flux vector mot
or control.
The FC 302 is able to handle permanent magnet synchronous motors (brushless servo motors)
as well as normal squirrel-cage asynchronous motors.
Short circuit behavior on the FC 302 depends on
the 3 current transducers in the motor phases
and the desaturation protection with feedback from the brake.
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MG.33.B6.22 - VLT is a registered Danfoss trademark
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