Danfoss VLT Decentral Drive FCD 302 Design Manual

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Danfoss VLT Decentral Drive FCD 302 Design Manual Manual pdf 19 page image

The remote reference is calculated once every scaninterval and initially consists of two types of referenceinputs:1. X (the external reference): A sum (see3-04 Reference Function) of up to four externallyselected references, comprising any combination(determined by the setting of 3-15 ReferenceResource 1, 3-16 Reference Resource 2 and3-17 Reference Resource 3) of a fixed presetreference (3-10 Preset Reference), variable analogreferences, variable digital pulse references, andvarious serial bus references in whatever unit thefrequency converter is controlled ([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 two types of reference inputs are combined in thefollowing formula: Remote reference=X+X*Y/100%. Ifrelative reference is not used 3-18 Relative Scaling ReferenceResource must be set to No function and to 0%. The catchup/slow down function and the freeze reference functioncan both be activated by digital inputs on the frequencyconverter. The functions and parameters are described inthe Programming Guide.The scaling of analog references are described inparameter groups 6-1* and 6-2*, and the scaling of digitalpulse references are described in parameter group 5-5*.Reference limits and ranges are set in parameter group3-0*.2.3.1 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 areclamped when necessary. The relation between theresulting reference (after clamping) is shown inIllustration 2.10/Illustration 2.11 and the sum of allreferences is shown in Illustration 2.12.Resulting referenceSum of allreferencesForwardReverseP 3-00 Reference Range= [0] Min-Max130BA184.10-P 3-03P 3-03P 3-02-P 3-02Illustration 2.10 Reference Range=[0] Min-MaxP 3-00 Reference Range =[1]-Max-MaxResulting referenceSum of allreferences-P 3-03P 3-03130BA185.10Illustration 2.11 Reference Range=[1] -Max-MaxThe value of 3-02 Minimum Reference can not be set to lessthan 0, unless1-00 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 2.12.130BA186.11P 3-03P 3-02 Sum of allreferencesP 3-00 Reference Range= [0] Min to MaxResulting referenceIllustration 2.12 Sum of all ReferencesProduct Overview VLT® Decentral Drive FCD 30218 MG04H102 - VLT® is a registered Danfoss trademark22