Pilz PNOZ s50 - Slow Shutdown of Power Circuits

Functiondescription
OperatingManualPNOZs50
1002194EN02
16
t
over
U
B1B2
U
Avg
Y10, Y11
Y20, Y21
01+, 02+
t
t
t
on
t
off
Fig.:Switchingthepowercircuitsonandoff
Legend:
}
Y10,Y11,Y20,Y21:SafeinputstoswitchtheoutputsO1+,O2+
}
O1+,O2+:Safeoutputs,powercircuit1and2
}
U
B1B2
:Supplyvoltageofpowercircuits
}
t
on
:Switchonpowercircuit
}
t
over
:Configuredoverexcitationtime
}
t
off
:Switchoffpowercircuit
}
U
Avg
:Configuredreducedvoltage(arithmeticmeanofthevoltageattheoutputsonce
theoverexcitationtimehaselapsed)
InputsY10,Y11(orY20,Y21)canbeactivatedviasinglepoleordualpolesafeoutputs.
INFORMATION
Detailsofthewiringcanbefoundinthechapterentitled"Commissioning",
under"Wiring".
4.2.2 Switchingthepowercircuitsonandoff(slowshutdownS35,S36)
Iftheswitchingtimesarenotcritical,theloadsatthepowercircuitscanalsobeshutdown
slowly.Aconnectedbrakeispermittedtohavelongerapplicationtimes,forexample.The
brakeswitcheswithlowernoiseandislowerwearing.
NOTICE
Thepowercircuit'sslowshutdownisnotsafetyrelated.Itmayonlybeused
whenpermittedbythehazardanalysis.
Toshutdowntheinductiveloadsafely,thefastshutdownmustbeactivated
aftertheslowshutdown.Thatwaythebrakehasadualpoleshutdown.
A1/0pulseedgeatoneoftheslowshutdowninputs(S35orS36)switchesoffthecorres
pondingpowercircuit(O1+,O2+)insinglepolemode.Aflywheeldiodemeansthatthecur
rentonlydissipatesthemagneticfieldslowly.