Danfoss VLT Decentral Drive FCD 302 Design Manual

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Danfoss VLT Decentral Drive FCD 302 Design Manual Manual pdf 35 page image

The remote reference is calculated once in every scaninterval and initially consists of 2 types of referenceinputs:• X (the external reference): A sum (seeparameter 3-04 Reference Function) of up to 4externally selected references. These comprise anycombination (determined by the setting ofparameter 3-15 Reference Resource 1,parameter 3-16 Reference Resource 2, andparameter 3-17 Reference Resource 3) of a fixedpreset reference (parameter 3-10 Preset Reference),variable analog references, variable digital pulsereferences, and various fieldbus references in theunit, which controls the frequency converter ([Hz],[RPM], [Nm] and so on).• Y (the relative reference): A sum of 1 fixed presetreference (parameter 3-14 Preset Relative Reference)and 1 variable analog reference(parameter 3-18 Relative Scaling ReferenceResource) in [%].The 2 types of reference inputs are combined in thefollowing formula: Remote reference=X+X*Y/100%. Ifrelative reference is not used, set parameter 3-18 RelativeScaling Reference Resource to [0] No function andparameter 3-14 Preset Relative Reference to 0%. The catchup/slow down function and the freeze reference function canboth be activated by digital inputs on the frequencyconverter. The functions and parameters are described inthe VLT® AutomationDrive FC 301/FC 302 ProgrammingGuide.The scalings of analog references are described inparameter groups 6-1* Analog Input 1 and 6-2* Analog Input2, and the scaling of digital pulse references are describedin parameter group 5-5* Pulse Input.Reference limits and ranges are set in parameter group 3-0*Reference Limits.2.6.1 Reference LimitsParameter 3-00 Reference Range, parameter 3-02 MinimumReference, and parameter 3-03 Maximum Reference togetherdefine the allowed range of the sum of all references. Thesum of all references is clamped when necessary. Therelation between the resulting reference (after clamping) isshown in Illustration 2.23/Illustration 2.24 and the sum of allreferences is shown in Illustration 2.25.Resulting referenceSum of allreferencesForwardReverseP 3-00 Reference Range= [0] Min-Max130BA184.10-P 3-03P 3-03P 3-02-P 3-02Illustration 2.23 Reference Range=[0] Min-MaxP 3-00 Reference Range =[1]-Max-MaxResulting referenceSum of allreferences-P 3-03P 3-03130BA185.10Illustration 2.24 Reference Range=[1] -Max-MaxThe value of parameter 3-02 Minimum Reference cannot beset to less than 0, unless parameter 1-00 ConfigurationMode is set to [3] Process. In that case, the followingrelations between the resulting reference (after clamping)and the sum of all references is as shown inIllustration 2.25.130BA186.11P 3-03P 3-02 Sum of allreferencesP 3-00 Reference Range= [0] Min to MaxResulting referenceIllustration 2.25 Sum of all ReferencesProduct Overview and Functi... Design GuideMG04H302 Danfoss A/S © 05/2018 All rights reserved. 332 2