Danfoss FC 300 Design Manual

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

Contents

Danfoss FC 300 Design Manual Manual pdf 28 page image

3.2.9. Reference HandlingReferences and feedback can be scaled in physical units (i.e., RPM, Hz, °C) or simply in % relatingto the values of par. 3-02Minimum Reference and par. 3-03Maximum Reference.In this case, all analog and pulse inputs are scaled according to the following rules:• When par. 3-00Reference Range: [0] Min - Max 0% reference equals 0 [unit] where unitcan be any unit, such as rpm, m/s, bar, etc. 100% reference equals the Max (abs (par.3-03 Maximum Reference), abs (par. 3-02 Minimum Reference).• When par. 3-00Reference Range: [1] -Max - +Max 0% reference equals 0 [unit] -100%reference equals -Max Reference 100% reference equals Max Reference.Bus references are scaled according to the following rules:• When par. 3-00Reference Range: [0] Min - Max. To obtain max resolution on the busreference, the scaling on the bus is: 0% reference equals Min Reference and 100% ref-erence equals Max reference.• When par. 3-00Reference Range: [1] -Max - +Max -100% reference equals -Max Ref-erence 100% reference equals Max Reference.Par. 3-00Reference Range, 3-02Minimum Reference and 3-03Maximum Reference togetherdefine the allowed range of the sum of all references. The sum of all references is clamped whennecessary. The relation between the resulting reference (after clamping) and the sum of all ref-erences is shown below.The value of par. 3-02Minimum Referencecan not be set to less than 0, unless the par.1-00Configuration Mode is set to [3] Process.In this case, the subsequent relations be-tween the resulting reference (after clamping)and the sum of all references are as shown tothe right.3. Introduction to FC 300 FC 300 Design Guide28 MG.33.B9.22 - VLT® is a registered Danfoss trademark.3