3.2.4 Control Structure in VVCplus Advanced Vector ControlControl structure in VVC plus open loop and closed loop configurations:In the configuration shown in the illustration above, par. 1-01Motor Control Principle is set to “VVCplus [1]” and par. 1-00Configuration Mode is set to“Speed open loop [0]”. The resulting reference from the reference handling system is received and fed through the ramp limitation and speed limitationbefore being sent to the motor control. The output of the motor control is then limited by the maximum frequency limit.If par. 1-00Configuration Mode is set to “Speed closed loop [1]” the resulting reference will be passed from the ramp limitation and speed limitation intoa speed PID control. The Speed PID control parameters are located in the par. group 7-0*. The resulting reference from the Speed PID control is sentto the motor control limited by the frequency limit.Select “Process [3]” in par. 1-00Configuration Mode to use the process PID control for closed loop control of e.g. speed or pressure in the controlledapplication. The Process PID parameters are located in par. group 7-2* and 7-3*.FC 300 Design Guide 3 Introduction to AutomationDrive FC 300MG.33.BC.02 - VLT® is a registered Danfoss trademark 213
