Danfoss VLT AutomationDrive FC 302 Design Manual

Also see for VLT AutomationDrive FC 302: Service guide Programming guide Instruction manual Installation guide Operating guide

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Danfoss VLT AutomationDrive FC 302 Design Manual Manual pdf 25 page image

When the last event/action has been executed, thesequence starts over again from event [0]/action [0].Illustration 5.4 shows an example with 4 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 5.4 Order of Execution when 4 Events/Actions areProgrammedComparatorsComparators are used for comparing continuous variables(output frequency, output current, analog input, and so on)to fixed preset values.Par. 13-11Comparator Operator=TRUE longer than.. . .. . .Par. 13-10Comparator OperandPar. 13-12Comparator Value130BB672.10Illustration 5.5 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 5.6 Logic Rules5.2.12 Safe Torque OffThe Safe Torque Off (STO) function is used to stop thedrive in emergency stop situations.For more information about Safe Torque Off, includinginstallation and commissioning, refer to the Safe Torque OffOperating Guide.Liability conditionsThe customer is responsible for ensuring that personnelknow how to install and operate the safe torque offfunction by:• Reading and understanding the safety regulationsconcerning health, safety, and accidentprevention.• Understanding the generic and safety guidelinesprovided in the Safe Torque Off Operating Guide.• Having a good knowledge of the generic andsafety standards for the specific application.5.3 Dynamic Braking OverviewDynamic braking slows the motor using 1 of the followingmethods:• AC brakeThe brake energy is distributed in the motor bychanging the loss conditions in the motor(parameter 2-10 Brake Function = [2]). The ACbrake function cannot be used in applicationswith high cycling frequency since this situationoverheats the motor.• DC brakeAn overmodulated DC current added to the ACcurrent works as an eddy current brake(parameter 2-02 DC Braking Time ≠ 0 s).• Resistor brakeA brake IGBT keeps the overvoltage under acertain threshold by directing the brake energyfrom the motor to the connected brake resistor(parameter 2-10 Brake Function = [1]). For moreinformation on selecting a brake resistor, see VLT®Brake Resistor MCE 101 Design Guide.For drives equipped with the brake option, a brake IGBTalong with terminals 81(R-) and 82(R+) are included forconnecting an external brake resistor.The function of the brake IGBT is to limit the voltage in theDC link whenever the maximum voltage limit is exceeded.It limits the voltage by switching the externally mountedresistor across the DC bus to remove excess DC voltagepresent on the bus capacitors.External brake resistor placement has the advantages ofselecting the resistor based on application need,dissipating the energy outside of the control panel, andprotecting the drive from overheating if the brake resistoris overloaded.Product Features Design GuideMG38C202 Danfoss A/S © 01/2018 All rights reserved. 235 5