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UserGuideRevision1.121
www.beijerelectronics.com
25
4.10.7. “STO“ElectricalInstallation
The“STO”wiringshallbeprotectedfrominadvertentshortcircuitsortampering whichcouldleadtofailureofthe“STO”inputsignal,
furtherguidanceisgiveninthediagramsbelow.
Inadditiontothewiringguidelinesforthe“STO”circuitbelow,section4.1.1“RecommendedinstallationforEMCcompliance.shouldalso
be
followed.
Thedriveshouldbewiredasillustratedbelow;the24Vdcsignalsourceappliedtothe“STO”inputcanbeeitherfromthe24Vdconthedriveor
fromanExternal24Vdcpowersupply.
4.10.7.1. Recommended“STO”wiring
UsinganExternal24VdcPowerSupply. Usingthedrivesonboard24Vdcsupply

TwistedPair
Shieldedcables
1213
0V
+24Vdc
Safetyrelay
ProtectiveCappedTrunking
orequivalenttoprevent
STOCableshortcircuittoan
externalVoltagesource.
External
Power
Supply



Note:TheMaximumcablelengthfromVoltagesourcetothedriveterminalsshouldnotexceed25mtrs.
4.10.8. ExternalPowersupplySpecification.
VoltageRating(Nominal) 24Vdc
STOLogicHigh 1830Vdc(Safetorqueoffinstandby)
CurrentConsumption(Maximum) 100mA
4.10.9. SafetyRelaySpecification.
Thesafetyrelayshouldbechosensothatatminimumitmeetsthesafetystandardsinwhichthedrivemeets.
StandardRequirements SIL2orPLdSC3orbetter(WithForciblyguidedContacts)
NumberofOutputContacts 2independent
SwitchingVoltageRating 30Vdc
SwitchingCurrent 100mA
Wiresshouldbe
protected
againstshort
circuitsas
shownabove
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