Danfoss VLT Decentral Drive FCD 302 Design Manual

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Danfoss VLT Decentral Drive FCD 302 Design Manual Manual pdf 76 page image

4.9 Smart Logic ControlSmart logic control (SLC) is essentially a sequence of user-defined actions (see parameter 13-52 SL Controller Action[x]) executed by the SLC when the associated user-definedevent (see parameter 13-51 SL Controller Event [x]) isevaluated as true by the SLC.The condition for an event can be a particular status orthat the output from a logic rule or a comparator operandbecomes true. This leads to an associated action asillustrated in Illustration 4.9.. . .. . .Par. 13-11Comparator OperatorPar. 13-43Logic Rule Operator 2Par. 13-51SL Controller EventPar. 13-52SL Controller Action130BB671.13CoastStart timerSet Do X lowSelect set-up 2. . .RunningWarningTorque limitDigital input X 30/2. . .=TRUE longer than... . .. . .Illustration 4.9 Current Control Status/Event and ActionEvents and actions are each numbered and linked togetherin pairs (states). This means that when event [0] is fulfilled(attains the value true), action [0] is executed. After this,the conditions of event [1] is evaluated and if evaluatedtrue, action [1] is executed, and so on. Only 1 event isevaluated at any time. If an event is evaluated as false,nothing happens (in the SLC) during the current scaninterval and no other events are evaluated. This meansthat when the SLC starts, it evaluates event [0] (and onlyevent [0]) each scan interval. Only when event [0] isevaluated true, the SLC executes action [0] and startsevaluating event. It is possible to program from 1 to 20events and actions.When the last event/action has been executed, thesequence starts over again from event [0]/action [0].Illustration 4.10 shows an example with 3 event/actions.130BA062.14State 113-51.013-52.0 State 213-51.113-52.1Startevent P13-01State 313-51.213-52.2State 413-51.313-52.3Stopevent P13-02Stopevent P13-02Stopevent P13-02Illustration 4.10 Example - Internal Current ControlComparatorsComparators are used for comparing continuous variables(that is, output frequency, output current, analog input,and so forth) to fixed preset values.Par. 13-11Comparator Operator=TRUE longer than.. . .. . .Par. 13-10Comparator OperandPar. 13-12Comparator Value130BB672.10Illustration 4.11 ComparatorsLogic rulesCombine up to 3 boolean inputs (true/false inputs) fromtimers, comparators, digital inputs, status bits, and eventsusing the logical operators AND, OR, and NOT.. . .. . . . . .. . .Par. 13-43Logic Rule Operator 2Par. 13-41Logic Rule Operator 1Par. 13-40Logic Rule Boolean 1Par. 13-42Logic Rule Boolean 2Par. 13-44Logic Rule Boolean 3130BB673.10Illustration 4.12 Logic RulesApplication Examples VLT® Decentral Drive FCD 30274 Danfoss A/S © 05/2018 All rights reserved. MG04H30244