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

3. Introduction to FC 300

3.2.3. 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
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 desaturation circuit in
3
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, VVC
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.
22
plus
or flux vector motor control.
MG.33.B9.22 - VLT ®
plus ).
is a registered Danfoss trademark.
FC 300 Design Guide