FC 300 Design GuideIntroduction to FC 300" FC 301 vs. FC 302 Control PrincipleThe FC 301 is a general-purpose adjustable frequency drive for variable speed applications. Thecontrol 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 linkor motor phase. The ground fault protection on the motor side is solved by a de-saturationcircuit 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 thedesaturation protection with feedback from the 3 lower IGBTs and the brake.The FC 302 is a high-performance adjustable frequency drive for demanding applications. Theadjustable frequency drive can handle various kinds of motor control principles such as U/fspecial 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 phasesand the desaturation protection with feedback from the brake.18 MG.33.B6.22 - VLT is a registered Danfoss trademark
