Danfoss FC 300 Design Manual

Also see for FC 300: Operating instructions Instruction manual Design guide Design guide Design guide

Contents

Danfoss FC 300 Design Manual Manual pdf 24 page image

3.2.6 Control Structure in Flux with Motor FeedbackControl structure in Flux with motor feedback configuration (only available in AutomationDrive FC 302):In the shown configuration, par. 1-01Motor Control Principle is set to “Flux w motor feedb [3]” and par. 1-00Configuration Mode is set to “Speed closed-loop [1]”.The motor control in this configuration relies on a feedback signal from an encoder mounted directly on the motor (set in par. 1-02Flux Motor FeedbackSource).Select “Speed closed-loop [1]” in par. 1-00Configuration Mode to use the resulting reference as an input for the Speed PID control. The Speed PID controlparameters are located in par. group 7-0*.Select “Torque [2]” in par. 1-00Configuration Mode to use the resulting reference directly as a torque reference. Torque control can only be selected intheFlux with motor feedback (par. 1-01Motor Control Principle) configuration. When this mode has been selected, the reference will use the Nm unit.It requires no torque feedback, since the actual torque is calculated on the basis of the current measurement of the adjustable frequency drive.Select “Process [3]” in par. 1-00Configuration Mode to use the process PID control for closed-loop control of, e.g., speed or a process variable in thecontrolled application.3.2.7 Internal Current Control in VVCplus ModeThe adjustable frequency drive features an integral current limit control which is activated when the motor current, and thus the torque, is higher thanthe torque limits set in par. 4-16Torque Limit Motor Mode, par. 4-17Torque Limit Generator Mode and par. 4-18Current Limit.When the adjustable frequency drive is at the current limit during motor operation or regenerative operation, the adjustable frequency drive will try toget below the preset torque limits as quickly as possible without losing control of the motor.3.2.8 Local (Hand On) and Remote (Auto On) ControlThe adjustable frequency drive can be operated manually via the local control panel (LCP) or remotely via analog and digital inputs and serial bus.If allowed in par. 0-40[Hand on] Key on LCP, par. 0-41[Off] Key on LCP, par. 0-42[Auto on] Key on LCP, and par. 0-43[Reset] Key on LCP, it is possibleto start and stop the adjustable frequency drive via the LCP using the [Hand ON] and [Off] keys. Alarms can be reset via the [RESET] key. After pressingthe [Hand ON] key, the adjustable frequency drive goes into hand mode and follows (as default) the local reference that can be set using arrow key onthe LCP.3 Introduction to AutomationDrive FC 300 FC 300 Design Guide3-8 MG.33.BC.22 - VLT® is a registered Danfoss trademark3