Beijer-electronics BFI-P2 V1.21 Manual de usuario descargar pdf (Pagina 23)

UserGuideRevision1.121

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4.10. SafeTorqueOff

SafeTorqueOFFwillbereferredtoas“STO”throughtheremainderofthissection.

4.10.1. Responsibilities

The overall system designer is responsible for defining the requirements of the overall “Safety Control System” within which the drive will be

incorporated;furthermorethesystemdesignerisresponsibleforensuringthatthecompletesystemisriskassessedandthatthe“Safetycontrol

System”requirementshavebeenentirelymetandthat

thefunctionisfullyverified,thismustincludeconfirmationtestingofthe“STO”function

beforedrivecommissioning.

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Thesystem designer shall determinethe possiblerisks and hazardswithin the system by carryingout a thorough risk andhazard analysis,the

outcomeoftheanalysisshouldprovideanestimateofthepossiblehazards,furthermoredeterminetherisklevelsandidentifyanyneedsforrisk

reduction.The“STO”functionshouldbeevaluatedtoensureitcansufficientlymeettherisklevelrequired.

4.10.2. WhatSTOProvides

Thepurposeofthe“STO“functionistoprovideamethodofpreventingthedrivefromcreatingtorqueinthemotorintheabsenceofthe“STO“

inputsignals(Terminal12withrespecttoTerminal13),thisallowsthedrivetobeincorporatedintoacompletesafetycontrolsystemwhere

“STO“requirementsneedtobefulfilled.

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The“STO“functioncantypicallyeliminatetheneedforelectro‐mechanicalcontactorswithcross‐checkingauxiliarycontactsaspernormally

requiredtoprovidesafetyfunctions.

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Thedrivehasthe“STO“Functionbuilt‐inasstandardandcomplieswiththedefinitionof“Safetorqueoff“asdefinedbyIEC61800‐5‐2:2007.

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The“STO“Functionalsocorrespondstoanuncontrolledstopinaccordancewithcategory0(EmergencyOff),ofIEC60204‐1.Thismeansthat

themotorwillcoasttoastopwhenthe“STO”functionisactivated,thismethodofstoppingshouldbeconfirmedasbeingacceptabletothe

systemthemotorisdriving.

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The“STO“functionisrecognisedasafailsafemethodeveninthecasewherethe“STO“signalisabsentandasinglefaultwithinthedrivehas

occurred,thedrivehasbeenproveninrespectofthisbymeetingthefollowingsafetystandards:

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SIL

(SafetyIntegrityLevel)

PFH

D

(ProbabilityofdangerousFailuresperHour)

SFF

(Safefailurefraction%)

Lifetimeassumed

EN61800‐5‐2 2 1.23E‐091/h(0.12%ofSIL2) 50 20Yrs



 PL

(Performancelevel)

CCF(%)

(CommonCauseFailure)

ENISO13849‐1 PLd 1



SILCL

EN62061 SILCL2

Note:Thevaluesachievedabovemaybejeopardiseifthedriveisinstalledoutsideofthe Environmentallimitsdetailedinsection10.1

“Environmental“.

4.10.3. WhatSTOdoesnotprovide

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DisconnectandISOLATEthedrivebeforeattemptinganyworkonit.The“STO“functiondoesnotpreventhighvoltagesfrombeing

presentatthedrivepowerterminals.

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1

Note:The“STO“functiondoesnotpreventthedrivefromanunexpectedre‐start.Assoonas the“STO“inputsreceivetherelevant

signal it is possible (subject to parameter settings) to restart automatically, Based on this, the function should not be used for

carryingoutshort‐termnon‐electrical

machineryoperations(suchascleaningormaintenancework).

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Note:Insomeapplicationsadditionalmeasuresmayberequiredtofulfilthesystemssafetyfunctionneeds:the“STO“function

doesnotprovidemotorbraking.Inthecasewheremotorbrakingisrequiredatimedelaysafetyrelayand/oramechanicalbrake

arrangementorsimilarmethodshouldbeadopted,considerationshouldbemadeovertherequiredsafetyfunctionwhenbrakingas

thedrivebrakingcircuitalonecannotberelieduponasafail‐safemethod.

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Whenusingpermanentmagnetmotorsandintheunlikelyeventofamultipleoutputpowerdevicesfailingthenthemotorcould

effectivelyrotatethe

motorshaftby180/pdegrees(Wherepdenotesnumberofmotorpolepairs).

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