Danfoss VLT 6002-6011 Installation, Operation And Maintenance Manual

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Danfoss VLT 6002-6011 Installation, Operation And Maintenance Manual Manual pdf 41 page image

41Reference HandlingReference handling is shown in the block diagram at the bottom of thispage. The block diagram shows how a change in a parameter canaffect the resulting reference.Parameters 203 to 205, Reference Handling, Minimum and MaximumReference, and parameter 210, Reference Type, define the wayreference handling can be carried out. These parameters are active bothin closed loop and open loop operation.In closed loop operation, the resulting reference is affected by param-eters 418 and 419, Setpoints, as well as by remote references.Remote references can be:- external references, including analog inputs 53, 54 and 60; pulsereferences through terminals 17 or 29 and references from serialcommunication.- preset references.The resulting reference can be shown in the display as a percentageby selecting Reference [%], or as a unit by selecting Reference [unit]in parameters 007 through 010. The sum of the external referencescan be shown in the display in a percentage of the range fromMinimum Reference to Maximum Reference. Select ExternalReference, [%] in parameters 007 through 010 Display Readout if areadout is required.It is possible to have both internal preset references and externalreferences at the same time. In parameter 210, Reference Type, achoice is made of how the preset references are to be combined withthe external references.An independent local reference exists, where the resulting reference isset by means of the + and - keys. In all cases, the output frequencyrange is limited by parameter 201, Output Frequency Low Limit, andparameter 202, Output Frequency High Limit.CAUTION!If local reference is active, drive isalways inOpen Loop, regardless of choice made in pa-rameter 100,Configuration.The unit of the local reference can be set either as Hz or as apercentage of the output frequency range. The unit is selected inparameter 011, Unit of Local Reference.203 Reference Handling (REFERENCE SITE)Value: Hand/Auto linked reference(LINKED TO HAND/START) [0]Remote controlled reference (REMOTE) [1]Local reference (LOCAL) [2]✭ Indicates default parameter. Depending upon the application, the drive may be delivered with other parameters selected.