3.6.3 Control Structure in VVC++_+_Config. modeRef.ProcessP 1-00High+f max.Low-f max.P 4-11Motor speedlow limit (RPM)P 4-12Motor speedlow limit (Hz)P 4-13Motor speedhigh limit (RPM)P 4-14Motor speedhigh limit (Hz)MotorcontrollerRampSpeedPIDP 7-20 Process feedback1 sourceP 7-22 Process feedback2 sourceP 7-00 Speed PIDfeedback sourceP 1-00Config. modeP 4-19Max. output freq.-f max.MotorcontrollerP 4-19Max. output freq.+f max.P 3-**P 7-0*130BA055.10Illustration 3.6 Control Structure in VVC+ Open Loop and Closed Loop ConfigurationsSee Active/Inactive Parameters in Different Drive Control Modes in the Programming Guide for an overview of which controlconfiguration is available, depending on selection of AC motor or PM Non salient motor. In the configuration shown inIllustration 3.6, 1-01 Motor Control Principle is set to [1] VVC+ and 1-00 Configuration Mode is set to [0] Speed open loop. Theresulting 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 1-00 Configuration Mode is set to [1] Speed closed loop, the resulting reference is passed from the ramp limitation andspeed limitation into a speed PID control. The Speed PID control parameters are located in parameter group 7-0* Speed PIDCtrl. The resulting reference from the Speed PID control is sent to the motor control limited by the frequency limit.Select [3] Process in 1-00 Configuration Mode to use the process PID control for closed loop control of e.g. speed or pressurein the controlled application. The Process PID parameters are located in parameter group 7-2* Process Ctrl. Feedb and 7-3*Process PID Ctrl.Basic Operating Principles VLT® AutomationDrive FC 301/FC 302 Design Guide, 0.25-75 kW20 MG33BF02 - Rev. 2013-12-2033
