Fc 301 Vs. Fc 302 Control Principle - Danfoss FC 300 Design Manual

FC 300 Design Guide
Introduction to FC 300

FC 301 vs. FC 302 Control Principle

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The FC 301 is a general-purpose adjustable frequency drive for variable speed applications. The
plus
control principle is based on voltage vector control (VVC ).
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. The 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 the 3 lower IGBTs and the brake.
The FC 302 is a high-performance adjustable frequency 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 motor 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