EN 574:1996+A1:2008

SLOVENSKI STANDARD
01-oktober-2008
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Safety of machinery - Two-hand control devices - Functional aspects - Principles for
design
Sicherheit von Maschinen - Zweihandschaltungen - Funktionelle Aspekte -
Gestaltungsleitsätze
Sécurité des machines - Dispositifs de commande bimanuelle - Aspects fonctionnels -
Principes de conception
Ta slovenski standard je istoveten z: EN 574:1996+A1:2008
ICS:
13.110 Varnost strojev Safety of machinery
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 574:1996+A1
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2008
ICS 13.110 Supersedes EN 574:1996
English Version
Safety of machinery - Two-hand control devices - Functional
aspects - Principles for design
Sécurité des machines - Dispositifs de commande Sicherheit von Maschinen - Zweihandschaltungen -
bimanuelle - Aspects fonctionnels - Principes de Funktionelle Aspekte - Gestaltungsleitsätze
conception
This European Standard was approved by CEN on 20 November 1996 and includes Amendment 1 approved by CEN on 18 May 2008.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 574:1996+A1:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3
Introduction .4
1 Scope .4
2 Normative references .5
3 Definitions .5
4 Types of two-hand control devices and their selection .7
5 Characteristics of safety functions.9
6 Requirements related to categories of control.10
7 Use of programmable electronic systems .11
8 Prevention of accidental actuation and of defeat.12
9 General requirements.14
10 Verification .16
11 Marking .20
12 Information for installation, use and maintenance .21
Annex A (normative) Measurement tests for the prevention of defeat.23
Annex B (informative) Use of categories (according to EN 954-1:1996) in types of two-hand
control devices.28
Annex ZA (informative) !!!!Relationship between this European Standard and the Essential
Requirements of EU Directive 98/37/EC"""".29
Annex ZB (informative) !!Relationship between this European Standard and the Essential
!!
Requirements of EU Directive 2006/42/EC"""".30
Bibliography .31

Foreword
This document (EN 574:1996+A1:2008) has been prepared by Technical Committee CEN/TC 114 “Safety of
machinery”, the Secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by December 2008, and conflicting national standards shall be withdrawn
at the latest by December 2008.
This document includes Amendment 1, approved by CEN on 2008-05-18.
This document supersedes EN 574:1996.
The start and finish of text introduced or altered by amendment is indicated in the text by tags ! ".
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
!For relationship with EU Directive(s), see informative Annexes ZA and ZB, which are integral parts of this
document."
This standard is a type B standard in the structure of A-/B-/C-standards as defined in EN 292.
Annex A of this standard is normative, whereas annexes B and C are informative.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and United Kingdom.
Introduction
This standard has been prepared to be a type B standard in the sense of the Machinery Directive
(89/392/EWG) and associated EFTA regulations.
A two-hand control device is a safety device (safety component). It provides a measure of protection for the
operator against reaching danger zones during hazardous situations by locating the control actuating devices
in a specific position. For hand held machinery it should be taken into consideration that the danger zone is
not stationary.
The selection of a two-hand control device as an appropriate safety device will depend upon the risk
assessment made by designers, standard makers and others in accordance with EN 292-1 and EN 1050.
The definition of a two-hand control device is given in 3.1 and takes precedence over the definition in 3.23.4 of
EN 292-1:1991.
In some arrangements enabling devices (see 3.23.2 of EN 292-1:1991) and/or hold-to-run devices (see 3.23.3
of EN 292-1:1991) may comply with the definition of a two-hand control device in this standard. Additionally,
some special control devices - such as teach pendants for robots and some crane controls – require the use
of two hands and can comply with the definition a two-hand control device in this standard.
1 Scope
This standard specifies the safety requirements of a two-hand control device and its logic unit as defined in
3.1.
This standard describes the main characteristics of two-hand control devices for the achievement of safety
and sets out combinations of functional characteristics for three types. This standard does not apply to
devices intended to be used as enabling devices, hold to run devices and as special control devices.
This standard does not specify with which machines two-hand control devices shall be used. It also does not
specify which types of two-hand-control device shall be used. Moreover it does not specify the distance
between the two-hand control device and the danger zone (see 9.8).
The standard provides requirements and guidance on the design and selection (based on a risk assessment)
of two-hand control devices including their assessment, the prevention of defeat and the avoidance of faults.
The standard also provides requirements and guidance for two-hand control devices containing a
programmable electronic system (see 7).
This standard applies to all two-hand control devices, independent of the energy used, including:
 Two-hand control devices which are or are not integral parts of a machine;
 Two-hand control devices which consist of one or more than one separate elements.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications.
These normative references are cited at the appropriate places in the text and the publications are listed in
this clause. For dated references, subsequent amendments to or revisions of any of these publications only
apply to this European Standard when incorporated. For undated references, the latest edition of the
publication applies.
EN 292-1:1991, Safety of machinery, basic concepts, general principles for design — Part 1: Basic
terminology, methodology.
EN 292-2:1991/A1:1995, Safety of machinery, basic concepts, general principles for design — Part 2:
Technical principles and specifications.
prEN 894-1:1992, Safety of machinery, ergonomics requirements for the design of displays and control
actuators – Part 1: Human interactions with displays and control actuators.
prEN 894-2:1992, Safety of machinery, ergonomics requirements for the design of displays and control
actuators – Part 2: Displays.
prEN 894-3:1992, Safety of machinery, ergonomics requirements for the design of displays and control
actuators – Part 3: Control actuators.
EN 954-1:1996, Safety of machinery, safety related parts of control systems — Part 1: General principles for
design.
prEN 999:1995, Safety of machinery, the positioning of protective equipment in respect of approach speeds of
parts of the human body.
EN 1050:1996, Safety of machinery, principles for risk assessment
EN 60204-1:1992, Safety of machinery, electrical equipment of machines – Part 1: General requirements.
3 Definitions
For the purposes of this standard, the following definitions apply:
3.1
two-hand control device
a device which requires at least simultaneous actuation by the use of both hands in order to initiate and to
maintain, whilst a hazardous condition exists, any operation of a machine thus affording a measure of
protection only for the person who actuates it (see figure 1)
Key
1 input signal
2 two-hand control device
3 control actuating device
4 signal converter(s)
5 signal processor(s)
6 output signal
7 logic unit
Figure 1 — Schematic representation of a two-hand control device

3.2
input signal
the externally actuated signal applied by hand to a control actuating device (see fig. 1)
3.3
control actuating device
a component of the two-hand control device which senses an input signal from one hand and transmits it to a
signal converter (see fig. 1)
3.4
simultaneous actuation
the continuing actuation of both control actuating devices during the same time period, whatever the time lag
is between the start of one input signal and the start of the other (see fig. 2)
NOTE In the English language the word "concurrent" and the word "simultaneous" are often used synonymously (e.g.
see clause 9.2.7 of EN 60204-1:1992).
3.5
synchronous actuation
a particular case of simultaneous actuation where the time lag between the start of one input signal and the
start of the other is less than or equal to 0,5 s (see fig. 3).
3.6
signal converter
a component of the two-hand control device which receives an input signal from a control actuating device
and which transmits and/or converts this signal into a form acceptable to the signal processor (see fig. 1).
3.7
signal processor
a part of the two-hand control device which generates the output signal as a consequence of the two input
signals (see fig. 1).
3.8
output signal
the signal generated by the two-hand control device to be fed into the machinery to be controlled, and which is
based on one pair of input signals (see fig. 1).
3.9
response time
the time between the release of a control actuating device and the cessation of the output signal (see 9.8)
3.10
mobile two-hand control device
a device which can be moved and used in more than one definable position relative to the danger zone of the
machine which it controls
4 Types of two-hand control devices and their selection
Table 1 defines three types of two-hand control devices. It sets out the functional characteristics and the
minimum measures for the safety of each type of two-hand control device in this standard. All two-hand
control devices shall comply with EN 292 and the relevant parts of EN 60204-1.

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