
PNOZc1
OperatingManualPNOZc1
22197EN02
6
}
Thesafetyfunctionremainseffectiveinthecaseofacomponentfailure.
}
Thecorrectopeningandclosingofthesafetyfunctionrelaysistestedautomaticallyin
eachonoffcycle.
Blockdiagram/terminalconfiguration
InputInput
A1 A2 S21 S22
=
Power
Reset/
Start
S34
S11
S12
=
K1
K2
13
23 33
24 34
14
41
42
*
S33
*Insulationtothenonmarkedarea:Protectiveseparation(overvoltagecategoryIII),
Insulationofrelaycontactsagainsteachother:Basicinsulation(overvoltagecategoryIII),
protectiveseparation(overvoltagecategoryII)
Functiondescription
Whenthesupplyvoltageissupplied,the"POWER"LEDilluminates.Theunitisreadyfor
operationwhenthestartcircuitisclosed.
}
Inputcircuitsclosed(e.g.theESTOPbuttonisnotpressed):Thesafetycontactsare
closedandtheauxiliarycontactisopen.
}
Inputcircuitopen(e.g.ESTOPoperated):Thesafetycontactsareopenandtheauxili
arycontactisclosed.
}
Dualchanneloperationwithdetectionofshortsacrosscontacts:redundantinputcircuit,
detects
– earthfaultsinthestartandinputcircuit,
– shortsbetweencontactsintheinputcircuit.
}
Automaticstart:Unitisactiveoncetheinputcircuithasbeenclosed.
}
ManualstartUnitisactiveoncetheinputcircuitisclosedandthenthestartcircuitis
closed.
}
Increaseinthenumberofavailableinstantaneoussafetycontactsbyconnectingcon
tactexpansionmodulesorexternalcontactors.
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