Danfoss FC 300 Design Manual

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

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Danfoss FC 300 Design Manual Manual pdf 23 page image

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 frequency converter.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 frequency converter features an integral current limit control which is activated when the motor current, and thus the torque, is higher than thetorque limits set in par. 4-16Torque Limit Motor Mode, par. 4-17Torque Limit Generator Mode and par. 4-18Current Limit.When the frequency converter is at the current limit during motor operation or regenerative operation, the frequency converter will try to get below thepreset torque limits as quickly as possible without losing control of the motor.3.2.8 Local (Hand On) and Remote (Auto On) ControlThe frequency converter 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 frequency converter via the LCP using the [Hand ON] and [Off] keys. Alarms can be reset via the [RESET] key. After pressing the[Hand ON] key, the frequency converter goes into Hand mode and follows (as default) the Local reference that can be set using arrow key on the LCP.After pressing the [Auto On] key, the frequency converter goes into Automode and follows (as default) the Remote reference. In this mode, it ispossible to control the frequency converter via the digital inputs and var-ious serial interfaces (RS-485, USB, or an optional fieldbus). See moreabout starting, stopping, changing ramps and parameter set-ups etc. inpar. group 5-1* (digital inputs) or par. group 8-5* (serial communica-tion).130BP046.10Active Reference and Configuration ModeThe active reference can be either the local reference or the remote reference.In par. 3-13Reference Site the local reference can be permanently selected by selectingLocal [2].To permanently select the remote reference selectRemote [1]. By selectingLinked to Hand/Auto [0] (default) the reference site will depend on whichmode is active. (Hand Mode or Auto Mode).FC 300 Design Guide 3 Introduction to AutomationDrive FC 300MG.33.BC.02 - VLT® is a registered Danfoss trademark 233