Danfoss VLT AutomationDrive FC 360 Design Manual

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Danfoss VLT AutomationDrive FC 360 Design Manual Manual pdf 25 page image

The remote reference is calculated once every scaninterval and initially consists of 2 types of referenceinputs:1. X (the external reference): A sum (see3-04 Reference Function) of up to 4 externallyselected references, comprising any combination(determined by the setting of 3-15 Reference 1Source, 3-16 Reference 2 Source and 3-17 Reference3 Source) of a fixed preset reference (3-10 PresetReference), variable analog references, variabledigital pulse references, and various serial busreferences in any unit the frequency converter ismonitoring ([Hz], [RPM], [Nm] etc.).2. Y (the relative reference): A sum of one fixedpreset reference (3-14 Preset Relative Reference)and one variable analog reference (3-18 RelativeScaling Reference Resource) in [%].The 2 types of reference inputs are combined in thefollowing formula: Remote reference=X+X*Y/100%. Ifrelative reference is not used, set 3-18 Relative ScalingReference Resource to [0] No function and 3-14 PresetRelative Reference to 0%. The catch up/slow down functionand the freeze reference function can both be activated bydigital inputs on the frequency converter. The functionsand parameters are described in the VLT® AutomationDriveFC 360 Programming Guide.The scaling of analog references is described in parametergroups 6-1* Analog Input 53 and 6-2* Analog Input 54, andthe scaling of digital pulse references is described inparameter group 5-5* Pulse Input.Reference limits and ranges are set in parameter group3-0* Reference Limits.2.4.1 Reference Limits3-00 Reference Range, 3-02 Minimum Reference and3-03 Maximum Reference together define the allowed rangeof the sum of all references. The sum of all references isclamped when necessary. The relation between theresulting reference (after clamping) and the sum of allreferences is shown in Illustration 2.17 and Illustration 2.18.Resulting referenceSum of allreferencesForwardReverseP 3-00 Reference Range= [0] Min-Max130BA184.10-P 3-03P 3-03P 3-02-P 3-02Illustration 2.17 Sum of All References When Reference Rangeis Set to 0P 3-00 Reference Range =[1]-Max-MaxResulting referenceSum of allreferences-P 3-03P 3-03130BA185.10Illustration 2.18 Sum of All References When Reference Rangeis Set to 1The value of 3-02 Minimum Reference cannot be set to lessthan 0, unless 1-00 Configuration Mode is set to [3] Process.In that case, the following relations between the resultingreference (after clamping) and the sum of all references isas shown in Illustration 2.19.Product Overview Design GuideMG06B402 Danfoss A/S © 09/2014 All rights reserved. 232 2