Pilz PNOZ s50 - Function Description; Function Description Introduction; Core Functions and Operation; Fast Shutdown of Power Circuits

Functiondescription
OperatingManualPNOZs50
1002194EN02
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4 Functiondescription
4.1 Introduction
ThePWMrelayPNOZs50isusedforthesafetyrelatedshutdownofinductiveloads.
Ithastwopoweroutputstoactivatetwoindependent,inductiveloads.Eachpowercircuitis
switchedindependentlybytwoinputs.Twofeedbackloopsmonitortheswitchstatusofthe
inductiveloads.Twofailsafeoutputssignaltheswitchstatusoftheinductiveloadstothe
higherlevelsafetycontrolsystem.Afailsafefaultsignaloutputsignalsanyfaulttoahigher
levelsafetycontrolsystem.
Thedeviceisconfigurable.Alltheparameterscanbesetviaarotaryknobwithpushbutton.
Thestateoftheinputsandoutputs,theconfigurationandanyfaultsareshownonadis
play.Theconfigurationisstoredonachipcard.
Thereisanintegratedcounter,whichrecordsthenumberofoperationsforeachpowercir
cuit.
Blockdiagram
A1 A2
Y20 Y21 Y22 Y23
Power
=
B1
B2
O1-
O1+
O2+
O2-
Feed-
back
Y10 Y11 Y12 Y13
Inputs
fast
O3 O4
O5
S35
Y1 Y2
Feed-
back
T0 T1
Inputs
fast
S36
Input
slow
Input
slow
Supply
S11
Logic
=
Fig.:Blockdiagram
Potentialisolation,potentialconnection:
}
PotentialisolationbetweenthesupplyvoltagesA1/A2andB1/B2.
}
PotentialconnectionbetweenthepoweroutputsO1+/O1,O2+/O2andthesupply
voltageB1/B2.
}
Potentialconnectionbetweenthesemiconductorinputsandsinglepoleoutputs,
voltageoutputandsupplyvoltageA1/A2.
4.2 Functions
4.2.1 Switchingthepowercircuitsonandoff(fastshutdown)
ThedevicehastwosafedualpoleoutputsO1+/O1(powercircuit1)andO2+/O2(power
circuit2),whichcanbeswitchedusinginputsY10/Y11(powercircuit1)andY20/Y21
(powercircuit2):