3.2.3 FC 301 vs. FC 302 Control PrincipleFC 301 is a general purpose frequency converter for variable speed applications. The control principle is based on VoltageVector Control (VVCplus).FC 301 can handle both asynchronous and PM motors.The current sensing principle in FC 301 is based on current measurement in the DC link or motor phase. The ground faultprotection on the motor side is solved by a de-saturation circuit in the IGBTs connected to the control board.Short circuit behaviour on FC 301 depends on the current transducer in the positive DC link and the desaturation protectionwith feedback from the 3 lower IGBT's and the brake.ML2 92L1 91L3 9389(+)88(-)R+82R-81U 96V 97W 98130BA192.12InrushR inrLoad sharing -De-saturation protectionLoad sharing +BrakeResistorDriveControlBoardIllustration 3.1 FC 301FC 302 is a high performance frequency converter for demanding applications. The frequency converter can handle variouskinds of motor control principles such as U/f special motor mode, VVCplus or Flux Vector motor control.FC 302 is able to handle Permanent Magnet Synchronous Motors (Brushless servo motors) as well as normal squirrel cageasynchronous motors.Short circuit behaviour on FC 302 depends on the 3 current transducers in the motor phases and the desaturationprotection with feedback from the brake.InrushR inrLoad sharing -Load sharing +LC Filter -(5A)LC Filter +(5A) BrakeResistor130BA193.13ML2 92L1 91L3 9389(+)88(-)R+82R-81U 96V 97W 98P 14-50Illustration 3.2 FC 302Introduction VLT® AutomationDrive FC 300 Design Guide, 0.25-75 kWMG33BE02 - VLT® is a registered Danfoss trademark 173 3RSPSupply - 1-888-532-2706 - www.RSPSupply.comhttp://www.RSPSupply.com/p-21462-Danfoss-131B8966-VLT-Automation-VT-Drive-VFD-FC301-230V-5-HP.aspx
