Alfa Laval ThinkTop - ThinkTop Digital

4Technicalspecications
4.2ThinkTopDigital
Power Power
Power
Supply Supply
Supply
TheThinkTopisdesignedtobeapartofthePLC’sInput/Output(I/O)system.Itshouldbesuppliedfromthesameprotected
powersupplyastheotherI/Odevices.TheI/Opowersupplyshouldnotbeusedforotherkindsofload.
Theunitisreversepolarityandshortcircuitprotected.
Supplyvoltagenominal:.............24±10%VDC
Supplyvoltageabsolutemax.:......30VDC.
Supplyvoltageabsolutemin.:......8VDC.
Supplycurrent*):....................Max.45mA(forsensorunitalone)
(excludingcurrenttothesolenoids,externalsensorandthePLCinputcurrent).
*)Theinitialcurrentduringpower-onishigher.Theactualshapeofthecurrentpulsedependsonthepowersupplyused.
Typicalvaluesare150mARMSduring13ms(regulatedPS)to360mARMSduring8ms(unregulatedPS).
FulfillmentoftheULrequirementsinUL508requirestheunittobesuppliedbyanisolatingsourcethatcomplieswiththe
requirementsforclass2powerunits(UL1310)orclass2and3transformers(UL1585).
Feedback Feedback
Feedback
signals signals
signals
Thesensorsystemcanbeusedfor4feedbacksignals+1statussignal=5digitalPNP/NPNfeedbacksignals.
OutputsignalsfromthesensorunittotheconnectedPLC.
Nominalvoltage:....................MustmatchtheselectedtypeofThinkTop.
Loadcurrent:........................Typically50mA,max.100mA.
Voltagedrop:........................Typically3Vat50mA.
PNP/NPN PNP/NPN
PNP/NPN
Polarity Polarity
Polarity
PNP(sourcing)orNPN(sinking)functionisselectedwithajumperinterm.12and13.Jumperpresent=PNP .Ifchangingto
NPN,removethejumberandmakeapowerrecycle.Apowerrecycleisalwaysrequiredwhenchangingthisfunction.
Solenoid Solenoid
Solenoid
valve valve
valve
signals signals
signals
Threeoutputsignals(withonecommon,terminal11)fromtheterminalrowareusedforactivationofthesolenoids.Positive
(connectedwithterminal9)ornegative.
T T
T
echnical echnical
echnical
specifications specifications
specifications
Norminalvoltage
Nominalpower
24VDC
1.0W.
10