Contrinex YRB-4EML-31S Instructions for use

SAFETY RELAY APPLICATION
Application manual for YRB-4EML-31S safety relay

Application manual for YRB-4EML-31S safety relay
Contrinex AG Industrial Electronics 2
Designation:
Revision:
Order No.:
SAFETYRELAYAPPLICATION
02 / 13.07.2016
605-000-728
This manualis valid for:
YRB-4EML-31S from Contrinex

Application manual for YRB-4EML-31S safety relay
Contrinex AG Industrial Electronics 3
Pleaseobserve the following notes
User group of this manual
The use of products described in this manual is oriented exclusively to:
–Qualified electriciansor persons instructedby them, who are familiar with applicable
standards and other regulationsregardingelectricalengineeringand, in particular,the
relevantsafety concepts.
–Qualified application programmersand software engineers, who are familiar with the
safety concepts of automationtechnology and applicable standards.
Explanation of symbols used and signal words
Thisis the safetyalert symbol. It isused to alert you to potentialpersonalinjury
hazards. Obey all safety measures that follow this symbol to avoid possible
injuryor death.
There are three different categories of personal injury that are indicated with a
signal word.
DANGER This indicates a hazardoussituationwhich, if not avoided, will
resultin death orserious injury.
WARNING This indicates a hazardous situation which, if not avoided, could
resultin death orserious injury.
CAUTION This indicates a hazardous situation which, if not avoided, could
resultin minor or moderate injury.
This symbol together with the signal word NOTE and the accompanying text
alert the reader to a situation which may cause damage or malfunction to the
device, hardware/software, or surrounding property.
This symbol and the accompanying text provide the reader with additional
informationor refer to detailed sources of information.
How to contact us
Internet Up-to-date
information onContrinexproductsand ourTermsand Conditionscan be found
on the Internetat:
www.contrinex.com
Subsidiaries If there are any problems that cannot be solved using the documentation,pleasecontact
your Contrinex subsidiary.
Subsidiary contact informationis availableat www.contrinex.com.
Published by CONTRINEX SA
André-Piller 50
1762 Givisiez
SWITZERLAND
Should you haveany suggestions orrecommendations forimprovement of the contentsand
layout of our manuals, please send your comments to:
[e-mail]

Application manual for YRB-4EML-31S safety relay
Contrinex AG Industrial Electronics 4
General terms and conditions of use for technical docum
e ntat i o n
Contrinex reserves the right to alter, correct, and/or improve the technical
documentation and the products described in the technical documentation at its own
discretion and withoutgivingprior notice, insofaras this is reasonablefor the user. The
same applies to any technical changes thatserve the purpose of technical progress.
The receipt of technical documentation (in particular user documentation) does not
constitute any further duty on the part of Contrinex to furnish informationon modifications
toproductsand/ortechnical documentation. You areresponsibleto verify the suitabilityand
intended use of the products in your specific application, in particularwith regard to
observing the applicable standards and regulations.All informationmade availablein the
technical data is supplied without any accompanying guarantee,whether expressly
mentioned,implied or tacitly assumed.
In
general, theprovisionsofthecurrentstandardTermsandConditionsof Contrinex apply
exclusively,in particular as concerns any warranty liability.
This manual, including all illustrationscontained herein, is copyright protected. Any
changes to the contents or the publication of extracts of this document is prohibited.
Contrinex reserves the right to register its own intellectual property rights for the product
identificationsofContrinexproducts that are used here. Registration ofsuch intellectual
property rights by third parties is prohibited.
Otherproduct identificationsmay be affordedlegalprotection,evenwheretheymaynotbe
indicated as such.

Application manual for YRB-4EML-31S safety relay
Contrinex AG Industrial Electronics 5
Table of contents
1 Introduction..................................................................................................................................................... 7
1.1 Target group for this application manual................................................................................................ 7
2 Safety of machines and systems ..................................................................................................................... 9
2.1 Functional safety ................................................................................................................................... 10
2.2 Practical procedure according to EN ISO 13849 ................................................................................... 10
2.2.1 Definition of the safety function ................................................................................................... 10
2.2.2 Determination of the required performance level (PL
r
) .............................................................. 11
2.2.3 Technical implementation............................................................................................................. 11
2.2.4 Dividing the safety function into subsystems ................................................................................ 12
2.2.5 Determination of the achieved PL for each subsystem................................................................. 12
2.2.6 Determination of the achieved PL for the overall safety function................................................ 14
2.2.7 Verification of the achieved PL...................................................................................................... 14
2.2.8 V alidatio n ...................................................................................................................................... 14
2.3 Practical procedure according to EN ISO 62061 ................................................................................... 15
2.3.1 Specification of requirements for the safety-related control function (SRCF)............................... 15
2.3.2 Determination of the required safety integrity level (SIL) ............................................................ 15
2.3.3 Drafting the safety-related electrical control system ................................................................... 15
(SRECS) .......................................................................................................................................................... 15
2.3.4 Determination of the achieved safety integrity for the entire SRECS........................................... 16
2.3.5 Verification of the achieved SIL...................................................................................................... 16
2.3.6 V alidatio n ...................................................................................................................................... 17
3 Safety technology basics ............................................................................................................................... 18
3.1 Cross-circuit detection .......................................................................................................................... 18
3.2 Maximum cable lengths ........................................................................................................................ 19
3.3 Stop ....................................................................................................................................................... 20
4 Application examples for YRB-4EML-31S safety relay .................................................................................. 22
4.1 Emergency stop..................................................................................................................................... 22
4.1.1 YRB-4EML-31S up to PL c/SIL 1 ...................................................................................................... 23
4.1.2 YRB-4EML-31S up to PL d/SIL 2 ..................................................................................................... 25
4.2 Light curtain (ESPE)................................................................................................................................ 27

Application manual for YRB-4EML-31S safety relay
Contrinex AG Industrial Electronics 6
4.2.1 YRB-4EML-31S up to PL e/SIL 3 ..................................................................................................... 28
4.3 Movable guards..................................................................................................................................... 30
4.3.1 YRB-4EML-31S up to PL d/SIL 2 ..................................................................................................... 31
4.6 Contact extension/forcibly guided contacts.......................................................................................... 33
A Appendix for document lists ......................................................................................................................... 34
A 1 Explanation of terms .................................................................................................................................. 34
A 1 Case studies –connection to a PLC ........................................................................................................... 36

Application manual for YRB-4EML-31S safety relay
Contrinex AG Industrial Electronics 7
1 Introduction
Theterm“safety” derivesfromLatin and refers to astatethatisfreefrom unacceptablerisks.
This fundamental human requirementis also enshrined in basic EUlaw.
The safety of machinesand systemsmainly depends on the correct application of
standards and directives. In Europe, the basis for this is the Machinery Directive, which
provides standard specifications to support companies when designing safety-related
machines. The aimisto eliminate barriers to tradewithin the EU. However, even outsidethe
European Economic Area, manyEuropean standards are gaining in importance duetotheir
internationalstatus.
Thefact that thesafetyof machines and systems notonlydepends onthe components and
technologies used, but is mainlyaffected by the “human”factor is no surprise.
1.1 Target group for this application manual
This manual is aimed at all designers of safety controllers.This manual should provide a
simple introduction to the technology of safety-relatedmachines and systemsand an
overviewof safety technology basics. You mustalways ensure you are familiar with the
directives, standards, and regulations relevant to the field of application.

Application manual for YRB-4EML-31S safety relay
Contrinex AG Industrial Electronics 8
1.3 Symbols used
Emergencystop
AOPD light curtain
Movable guard

Application manual for YRB-4EML-31S safety relay
Contrinex AG Industrial Electronics 9
2 Safety of machines and systems
In modern industrial production, the amount of complex technical equipment used is
constantly increasing. The purpose of safety technology is to reduce the risk to people,
working animals,the environment,and machinesas far as possible, and to at least a
reasonabledegree. The availabilityof production equipmentshould not be restricted any
more than is absolutelynecessary.
Safetyis
relative. Thereisno suchthingasanabsolutelysafemachine. However, sincethe
opening of the Europeansingle market, manufacturersand operators of machinesand
technical equipment are legally bound to observe Europeandirectives for the design and
operation of machines and systems.
When adhering to harmonized standards (assumed effect), which apply to a machine or
piece of technical equipment, it is assumed that they comply with legal regulationswhen
launched.
The Machinery Directiveis one of the most important single market directives. It is of such
importance because machineconstruction is one of the industrial mainstays of the
EuropeanEconomic Area. The Machinery Directive defines the requirementsmachinery
must meet before it can be placed on the market and operated in the EuropeanEconomic
Area.It also contains essential health and safety requirementsfor the planningand
construction of machinery and safety components.
Everymachine or system poses a risk. According to the requirements of the Machinery
Directive, a risk assessment must be carriedout for every machine.
If the risk is greater than the level of risk that can be tolerated,risk reduction must be
implemented.
Standard EN ISO12100 “Safetyof machinery - General principles for design - Risk
assessmentand risk reduction” describes the risks to be considered and the general
principles for design to reduce risk, and describes risk assessmentand risk reduction as a
repetitiveprocess to achieve safety. All phases in the life of the machine are therefore
assessed.
Procedure
Design-related
measures All
implemented?
Safety
measures All
implemented?
Organization
Risk
Figure1 Risk reduction in machines

Application manual for YRB-4EML-31S safety relay
Contrinex AG Industrial Electronics 10
2.1 Functional safety
Safety-related parts of machine control systems are frequently assigned to provide safety
functions. The contribution to the overall risk reduction of machinery by the safety-related
parts of a control system is determined according to EN ISO 12100.
Inordertoachievethenecessary
functional safetyof a machine orsystem,itis essential for
the safety-relatedparts of the safety equipment and control devices to operatecorrectly
and, in the event of failure, for the system to remain in the safe state or enter a safe state.
The requirementsfor achieving functionalsafety are based on the following objectives :
–Avoidance of systematicerrors
–Control of systematicerrors
–Control of random faults or failures
The requirementsof the safety-relatedparts of a machinecontrol system are specified in
EN ISO 13849 (and EN 62061).Thestandardspecifiesthevarioussafetylevelsintheform
of the “performance level”(and “safety integritylevel” (SIL)) for the safety-related parts
according to the degree of risk and describes the characteristicsof the safety functions.
2.2 Practical procedure according to EN ISO
13849
In practice, the following steps have proven effective when designing safe controllers
according to EN ISO 13849.
2.2.1 Definition of the safety function
The safety functions must be defined first. This informationis derived from the risk
assessment.
Example:
Trigger event: Opening the safety door.
Response: The robot drive is set to a safe stop state. The power
semiconductor pulses are disabled.
Safe state: Powercircuit has no power.