FprEN 12750

Safety of woodworking machines - Four sided moulding machines

2011-02-14 EMA: WI deleted following alert 2.

Sicherheit von Holzbearbeitungsmaschinen - Fräsmaschinen für vierseitige Bearbeitung

Dieses Dokument behandelt die signifikanten Gefährdungen, Gefährdungssituationen und Gefährdungs¬ereignisse, wie sie in Abschnitt 4 aufgelistet sind, und die zutreffen auf stationäre Fräsmaschinen für vierseitige Bearbeitung mit einer größtmöglichen Arbeitsbreite von 350 mm und einer größtmöglichen Geschwindigkeit des mechanischen Werkstückvorschubs von 200 m min1, mit elektrischer und / oder elektronischer Steuerung, im folgenden als "Maschinen" bezeichnet, die konstruiert sind zum Bearbeiten von Massivholz, Spanplatten, Faserplatten oder Sperrholz, sowie diesen Werkstoffen, wenn sie kunststoffbeschichtet oder mit Kantenmaterial versehen sind, wenn sie bestimmungsgemäß und entsprechend den vorhersehbaren Bedingungen des Herstellers verwendet werden einschließlich einem vernünftigerweise vorhersehbaren Missbrauch der Maschine (siehe 6.3 c)).
ANMERKUNG 1   Hinsichtlich der Definition einer stationären Maschine siehe 3.2.1.
Dieses Dokument behandelt auch die Gefährdungen, die sich auf folgende optionale Arbeitseinheiten beziehen:
   Universalspindel;
   Glasleistentrennaggregat.
Dieses Dokument ist nicht anzuwenden auf Maschinen, die zur Bearbeitung von Rundholz konstruiert sind, welches nicht vorbearbeitet worden ist.
Dieses Dokument behandelt nicht irgendwelche Gefährdungen im Zusammenhang mit:
1)   Einschubeinrichtungen (Magazine, Aufgabebehälter usw.);
ANMERKUNG 2   Für mechanische Einschubeinrichtungen, die auch den Zugriff zur Einschuböffnung verhindern siehe 5.3.7.2.
2)   einzelnen Maschinen, die in Kombination mit irgend einer anderen Maschine verwendet werden (als Teil einer Linie);
3)   heißen Oberflächen als Folge von Vorschubgeschwindigkeiten größer als 120 m min-1;
4)   Ausschubeinrichtungen (z. B. mechanischen Transportsystemen) mit Ausnahme von Gefährdungen durch Wegschleudern als Folge von Gleichlauffräsen.
Dieses Dokument gilt nicht für Fräsmaschinen für vierseitige Bearbeitung, die vor dem Datum seiner Veröffentlichung als EN hergestellt wurden.

Sécurité des machines pour le travail du bois - Machines à moulurer sur quatre faces

Le présent document traite des phénomènes dangereux, situations et événements dangereux significatifs, tels qu'énumérés dans l'Article 4, applicables aux machines à moulurer sur quatre faces d’une largeur maximale de travail de 350 mm et d’une vitesse maximale du mécanisme d’avance de pièce de 200 m/min, équipées d’un système de commande électrique et/ou électronique, désignées ci-après par le terme « machines ». Celles-ci sont conçues pour la coupe de bois massif, de panneaux de particules et de fibres, de contreplaqué ainsi que ces matériaux lorsque leurs surfaces ou leurs chants sont recouverts d’une matière plastique stratifiée, durant l’utilisation normale et dans les conditions prévues par le constructeur, y compris en cas de mauvais usage raisonnablement prévisible de la machine (voir 6.3).
NOTE 1   Pour la définition d’une machine fixe, voir 3.2.1.
Le présent document traite également des phénomènes dangereux liés aux autres unités d’usinage optionnelles suivantes :
a)   arbre universel ;
b)   unité de sciage pour coupe de parcloses.
Le présent document n’est pas applicable aux machines conçues pour la découpe de grumes non précédemment usinés.
Le présent document ne couvre pas les phénomènes dangereux relatifs aux
1)   dispositifs d’avance (magasins, trémies, etc.),
NOTE 2   Pour les dispositifs d’avance mécanique qui empêchent aussi l’accès aux ouvertures d’alimentation, voir 5.3.7.2.
2)   combinaison avec tout autre machine d’une machine simples utilisée (comme partie d’une ligne de fabrication),
3)   surfaces chaudes liées à des vitesses d’avance supérieures à 120 m min-1,
4)   dispositifs de sortie (par exemple systèmes de manutention mécanique), sauf pour les phénomènes dangereux liés à l’éjection de pièces de la machine lors d’une coupe en avalant.
Le présent document n’est pas applicable aux machines à moulurer sur quatre faces construites avant sa date de sa publication comme EN.

Varnost lesnoobdelovalnih strojev - Rezkalnik za štiristransko obdelavo

General Information

• Status: Not Published
• ICS: 79.120.10 - Woodworking machines
• Technical Committee: CEN/TC 142 - Woodworking machines - Safety
• Drafting Committee: CEN/TC 142/WG 9 - Four sided planing and moulding machines
• Current Stage: 4598 - Decision to abandon - Finalization for Vote
• Start Date: 14-Feb-2011
• Completion Date: 14-Feb-2011
• Directive: 2006/42/EC - Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast)
• Directive: 98/37/EC - Machinery
• Mandate: M/079 - Mandate to CEN and CENELEC for standardization in the field of machines
• Mandate: M/396 - Mandate to CEN and Cenelec for standardisation in the field of machinery
• Ref Project: oSIST prEN 12750:2008 - Safety of woodworking machines - Four sided moulding machines

Relations

• Revised: EN 12750:2001 - Safety of woodworking machines - Four-sided moulding machines
• Effective Date: 22-Dec-2008

Overview

FprEN 12750 is a comprehensive European standard developed by CEN (European Committee for Standardization) that addresses the safety requirements specifically for four sided moulding woodworking machines. It supersedes the earlier EN 12750:2001 standard and ensures compliance with essential health and safety requirements under the EU Machinery Directive and EFTA Regulations.

This standard covers stationary four sided moulding machines designed for machining solid wood, chipboard, fibreboard, plywood, and materials with plastic laminates or edgings. It applies to machines with a maximum working width of 350 mm and a maximum integrated work-piece feed speed of 200 m/min, including those with electrical and/or electronic control systems.

As a Type C standard under EN ISO 12100-1:2003, FprEN 12750 takes precedence over general Type A or B standards in matters relating to four sided moulding machines, providing detailed risk assessments and specific safety guidelines.

Key Topics

• Scope and Application

  • Targets stationary four sided moulding machines for woodworking with precise feed and cutting capabilities.
  • Covers hazards during normal operation and reasonably foreseeable misuse.
  • Includes optional work units such as universal spindles and glass bead cutting units.
  • Does not cover hazards related to infeed devices like magazines or hoppers, or machines used in combination within production lines.

• Hazards Addressed

  • Mechanical hazards: risk of break-up, ejections, moving parts access, and stability.
  • Control system safety: starting, stopping, emergency stops, mode selection, speed changes, and power failures.
  • Non-mechanical hazards: fire, noise, dust and chip emission, electricity, ergonomics, lighting, pneumatics, and hydraulics.
  • Specific focus on tool guarding, braking systems, and feed mechanisms to prevent injuries.

• Control Systems and Safety Features

  • Safe and reliable control system design principles.
  • Positioning and duplication of controls to enhance operator safety.
  • Emergency stop requirements and electrical supply failure management.
  • Integration of electronic safety-related components covered under normative annexes.

• Safety Information and Usage Guidance

  • Requirements for manufacturer-provided warning devices and clear marking.
  • Instruction handbooks detailing safe operation, maintenance, and risk mitigation.
  • Maintenance and fitting instruction to reduce improper handling risks.

Applications

FprEN 12750 is essential for manufacturers, designers, and safety engineers involved in the production and use of four sided moulding machines within woodworking industries. The standard’s practical applications include:

• Machine Design and Manufacturing
  Ensuring all new machines meet stringent safety criteria before market introduction, focusing on mechanical and non-mechanical hazard controls.

• Operator Safety Enhancements
  Guiding the implementation of safety controls, emergency stopping devices, and guarding to protect workers from injuries during machine operation.

• Compliance and Certification
  Helping manufacturers demonstrate conformity with European directives for legal market access across the EU and EFTA.

• Risk Management
  Assisting in hazard identification, risk assessment, and applying effective safety measures during machine use or foreseeable misuse conditions.

Related Standards

• EN ISO 12100-1:2003 - General principles for machine safety - risk assessment and risk reduction.
• EN 847-1:2005 + A1:2007 - Specifications for woodworking tooling, relevant for cutters and tool holders used in four sided moulding machines.
• EN 61508 / EN ISO 13849 - Functional safety of electrical/electronic control systems that may interface with the machines' safety controls.
• Machine-specific standards for infeed and feed systems, dust extraction, and noise control may also complement FprEN 12750 compliance.

---

By adhering to the requirements in FprEN 12750, stakeholders in the woodworking sector can effectively minimize the risk of accidents, enhance machine safety performance, and ensure regulatory conformity for four sided moulding machines used throughout Europe.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2008
Varnost lesnoobdelovalnih strojev - Rezkalnik za štiristransko obdelavo
Safety of woodworking machines - Four sided moulding machines
Sicherheit von Holzbearbeitungsmaschinen - Fräsmaschinen für vierseitige Bearbeitung
Sécurité des machines pour le travail du bois - Machines à moulurer sur quatre faces
Ta slovenski standard je istoveten z: prEN 12750
ICS:
79.120.10 Lesnoobdelovalni stroji Woodworking machines
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
DRAFT
prEN 12750
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2008
ICS 79.120.10 Will supersede EN 12750:2001
English Version
Safety of woodworking machines - Four sided moulding
machines
Sécurité des machines pour le travail du bois - Machines à Sicherheit von Holzbearbeitungsmaschinen -
moulurer sur quatre faces Fräsmaschinen für vierseitige Bearbeitung
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 142.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
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. prEN 12750:2008: E
worldwide for CEN national Members.

prEN 12750:2008 (E)
Contents Page
Foreword.4
Introduction .4
1 Scope.5
2 Normative references.5
3 Terms and definitions .8
3.1 General.8
3.2 Definitions.8
4 List of significant hazards .13
5 Safety requirements and/or measures .16
5.1 General.16
5.2 Controls.16
5.2.1 Safety and reliability of control systems.16
5.2.2 Position of controls .19
5.2.3 Starting.20
5.2.4 Normal stopping.20
5.2.5 Emergency stop.21
5.2.6 Mode selection.22
5.2.7 Speed changing.23
5.2.8 Direction of rotation.25
5.2.9 Integrated feed.25
5.2.10 Power operated spindle adjustment during setting.26
5.2.11 Control duplication.26
5.2.12 Failure of the power supply.27
5.2.13 Failure of control circuits.27
5.3 Protection against mechanical hazards .27
5.3.1 Stability.27
5.3.2 Risk of break-up during operation.27
5.3.3 Tool holder and tool design.28
5.3.4 Braking.30
5.3.5 Devices to minimise the possibility or the effect of ejection .32
5.3.6 Work-piece supports and guides.37
5.3.7 Prevention of access to moving parts and ejection of parts of tools .39
5.3.8 Required characteristics of tool guards.44
5.3.9 Retaining devices.44
5.4 Protection against non-mechanical hazards .45
5.4.1 Fire.45
5.4.2 Noise.45
5.4.3 Emission of chips and dust.46
5.4.4 Electricity.47
5.4.5 Ergonomics and handling.47
5.4.6 Lighting.48
5.4.7 Pneumatics.48
5.4.8 Hydraulics.48
5.4.9 Electromagnetic immunity.48
5.4.10 Static electricity.48
5.4.11 Supply disconnection (isolation) .48
5.4.12 Errors of fitting.49
5.4.13 Maintenance.49
prEN 12750:2008 (E)
6 Information for use.49
6.1 Warning devices.49
6.2 Marking.50
6.3 Instruction handbook.51
Annex A (informative) Use of well-tried components and safety principles .55
Annex B (normative) Use of electronic components .56
B.1 General.56
B.2 Safety-related parts of a control system (SRP/CS).56
B.2.1 Design.56
B.2.2 Safety-related software.56
B.2.3 Validation.57
Annex C (normative) Spindles specification.59
Annex D (normative) Braking tests.60
D.1 Conditions for all tests.60
D.2 Unbraked run-down time .60
D.3 Braked run-down time.60
D.4 Run-up time.61
Annex E (normative) Table lip resistance test.62
E.1 General.62
E.2 Test probe.62
E.3 Measurements.64
E.4 Tests.64
E.5 Result.65
E.6 Test report.65
Annex F (normative) Impact test method for guards .66
F.1 General.66
F.2 Test method.66
F.2.1 Preliminary remarks.66
F.2.2 Testing equipment.66
F.2.3 Projectile for guards.66
F.2.4 Sampling.67
F.2.5 Test procedure.67
F.3 Results.67
F.4 Assessment.68
F.5 Test report.68
F.6 Test equipment for impact test .68
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 98/37/EC.70
Annex ZB (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC.73
Bibliography.77

prEN 12750:2008 (E)
Foreword
This document (prEN 12750:2008) has been prepared by Technical Committee CEN/TC 142 “Woodworking
machines - Safety”, the secretariat of which is held by UNI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12750:2001.
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 the Machinery Directives.
For relationship with EC Directives, see informative Annex ZA and Annex ZB, which are integral part of this
document.
Organisations contributing to the preparation of this European Standard include the European Manufacturers
Association "EUMABOIS".
The European Standards produced by CEN/TC 142 are particular to woodworking machines and complement
the relevant A and B Standards on the subject of general safety (see introduction of EN ISO 12100-1:2003 for
a description of A, B and C standards).

Introduction
This document has been prepared to be a harmonised standard to provide one means of conforming to the
Essential Health and Safety Requirements of the Machinery Directive and associated EFTA Regulations.
This document is intended to replace EN 12750:2001. EN 12750:2001 can be further applied until 29/12/2009.

This document is a type C standard as defined in EN ISO 12100-1:2003.
The machinery concerned and the extent to which hazards, hazardous situations and events are covered is
indicated in the scope of this document.
When provisions of this type C standard are different from those which are stated in type A or B standards, the
provisions of this type C standard take precedence over the provisions of other standards, for machines that
have been designed and built according to the provisions of this type C standard.
The requirements of this document are directed to manufacturers and their authorised representatives of four
sided moulding machines. This document is also useful for designers.
This document also includes provisions and examples of information to be provided by the manufacturer to
the user.
Common requirements for tooling are given in EN 847-1:2005 + A1:2007.
prEN 12750:2008 (E)
1 Scope
This document deals with the significant hazards, hazardous situations and events as listed in clause 4, which
are relevant to stationary four sided moulding machines with a maximum working width of 350 mm and a
maximum speed of the integrated work-piece feed of 200 m/min, with electrical and/or electronic control
system, hereafter referred to as "machines" designed to cut solid wood, chipboard, fibreboard, plywood and
also these materials where these are covered with plastic laminate or edgings when they are used as
intended and under the conditions foreseen by the manufacturer, including reasonably forseeable misuse of
the machine (see 6.3 c)).
NOTE 1 For the definition of a stationary machine see 3.2.1.
This document deals also with hazards relating to the following optional work units:
universal spindle;
glass bead cutting unit.
This document is not applicable to machines designed for machining logs which have not previously been
machined.
This document does not deal with any hazards relating to:
1) infeed devices (magazines, hoppers, etc.);
NOTE 2 For mechanical infeed devices which also prevent access to the infeed opening see 5.3.7.2.
2) single machines being used in combination with any other machine (as part of a line);
-1
3) hot surfaces related to feed speeds exceeding 120 m min ;
4) outfeed devices (e.g. mechanical handling systems) except for hazards related to ejection from the
machine due to climb cutting.
This document is not applicable to four sided moulding machines which are manufactured before the date of
its publication as EN.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 294:1992, Safety of machinery – Safety distances to prevent danger zones being reached by the upper
limbs
EN 847-1:2005 + A1:2007, Tools for woodworking –Safety requirements – Part 1: Milling tools, circular saw
blades
EN 894-1:1997, Safety of machinery – Ergonomics requirements for the design of displays and control
actuators – Part 1: General principles for human interactions with displays and control actuators
EN 894-2:1997, Safety of machinery – Ergonomics requirements for the design of displays and control
actuators – Part 2: Displays
prEN 12750:2008 (E)
EN 894-3:2000, Safety of machinery — Ergonomics requirements for the design of displays and control
actuators — Part 3: Control actuators
EN 953:1997, Safety of machinery – Guards - General requirements for the design and construction of fixed
and movable guards
EN 982:1996, Safety of machinery — Safety requirements for fluid power systems and their components —
Hydraulics
EN 983:1996, Safety of machinery — Safety requirements for fluid power systems and their components —
Pneumatics
EN 1005-1:2001, Safety of machinery — Human physical performance — Part 1: Terms and definitions
EN 1005-2:2003, Safety of machinery — Human physical performance — Part 2: Manual handling of
machinery and component parts of machinery
EN 1005-3:2002, Safety of machinery — Human physical performance — Part 3: Recommended force limits
for machinery operation
EN 1005-4:2005, Safety of machinery — Human physical performance — Part 4: Evaluation of working
postures and movements in relation to machinery
EN 1037:1995, Safety of machinery — Prevention of unexpected start-up
EN 1088:1995 + A1:2007, Safety of machinery — Interlocking devices associated with guards — Principles
for design and selection
EN 1760-2:2001, Safety of machinery - Pressure sensitive protective devices - Part 2: General principles for
the design and testing of pressure sensitive edges and pressure sensitive bars
EN 50178:1997, Electronic equipment for use in power installations
EN 50370-1:2005, Electromagnetic compatibility (EMC) — Product family standard for machine-tools —
Part 1: Emission
EN 50370-2:2003, Electromagnetic compatibility (EMC) — Product family standard for machine-tools —
Part 2: Immunity
EN 60204-1:2006, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
(IEC 60204-1:2005, modified)
EN 60439-1:1999 + A1:2004, Low-voltage switchgear and controlgear assemblies — Part 1: Type-tested and
partially type-tested assemblies (IEC 60439-1:1999)
EN 60529:1991 + A1:2000, Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989)
EN 61310-1:1995, Safety of machinery — Indication, marking and actuation — Part 1: Requirements for visual,
auditory and tactile signals (IEC 61310-1:1995)
EN 61496-1:2004, Safety of machinery — Electro-sensitive protective equipment — Part 1: General
requirements and tests (IEC 61496-1:2004, modified)
EN 61508-2:2001, Functional safety of electrical/electronic/programmable electronic safety-related systems —
Part 2: Requirements for electrical/electronic/programmable electronic safety-related systems (IEC 61508-
2:2000)
prEN 12750:2008 (E)
EN 61508-3:2001, Functional safety of electrical/electronic/programmable electronic safety-related systems —
Part 3: Software requirements (IEC 61508-3:1998 + Corrigendum 1999)
EN 61508-7:2001, Functional safety of electrical/electronic/programmable electronic safety-related systems –
Part 7 Overview of techniques and measures (IEC 61508-7:2000)
EN 62061:2005, Safety of machinery – Functional safety of safety-related electrical, electronic and
programmable electronic control systems (IEC 62061:2005)
EN ISO 20354:2003, Acoustics - Measurement of sound absorption in a reverberation room (ISO 354:2003)
EN ISO 3743-1:1995, Acoustics — Determination of sound power levels of noise sources — Engineering
methods for small, moveable sources in reverberant fields — Part 1: Comparison method for hard-walled test
rooms (ISO 3743-1:1994)
EN ISO 3743-2:1996, Acoustics — Determination of sound power levels of noise sources using sound
pressure — Engineering methods for small, moveable sources in reverberant fields — Part 2: Methods for
special reverberation test rooms (ISO 3743-2:1994)
EN ISO 3744:1995, Acoustics — Determination of sound power levels of noise sources using sound pressure
— Engineering method in an essentially free field over a reflecting plane (ISO 3744:1994)
EN ISO 3745:2003 + AC:2006, Acoustics — Determination of sound power levels of noise sources using
sound pressure — Precision methods for anechoic and semi-anechoic rooms (ISO 3745:2003)
EN ISO 3746:1995, Acoustics — Determination of sound power levels of noise sources using sound pressure
— Survey method using an enveloping measurement surface over a reflecting plane (ISO 3746:1995)
EN ISO 4871:1996, Acoustics — Declaration and verification of noise emission values of machinery and
equipment (ISO 4871:1996)
EN ISO 9614-1:1995, Acoustics — Determination of sound power levels of noise sources using sound
intensity — Part 1: Measurement at discrete points (ISO 9614-1:1993)
EN ISO 11202:1995 + AC:1997, Acoustics — Noise emitted by machinery and equipment — Measurement of
emission sound pressure levels at a workstation and at other specified positions — Survey method in situ
(ISO 11202:1995)
EN ISO 11204:1995 + AC:1997, Acoustics — Noise emitted by machinery and equipment — Measurement of
emission sound pressure levels at a workstation and at other specified positions — Method requiring
environmental corrections (ISO 11204:1995)
EN ISO 11688-1:1998+AC:1998, Acoustics – Recommended practice for the design of low-noise machinery
and equipment – Part 1: Planning (ISO/TR 11688-1:1995)
EN ISO 12100-1:2003, Safety of machinery - Basic concepts, general principles for design - Part 1: Basic
terminology, methodology (ISO 12100-1:2003)
EN ISO 12100-2:2003, Safety of machinery - Basic concepts, general principles for design - Part 2: Technical
principles (ISO 12100-2:2003)
EN ISO 13849-1:2006, Safety of machinery — Safety-related parts of controls systems — Part 1: General
principles for design (ISO 13849-1:2006)
EN ISO 13849-2:2003, Safety of machinery — Safety-related parts of controls systems — Part 2: Validation
(ISO 13849-2:2003)
prEN 12750:2008 (E)
ISO 7960:1995, Airborne noise emitted by machine tools – Operating conditions for woodworking machines
3 Terms and definitions
3.1 General
For the purposes of this document the terms and definitions given in EN ISO 12100-1:2003 and the following
apply.
3.2 Definitions
3.2.1
four sided moulding machine
machine where the work-piece once loaded manually or by magazine, moves by an integrated feed
mechanism (machines where the first feed roller is fitted after the first tool are, for the purpose of this
document, integrated fed machines). The machine has at least four work units, one on each side, with rotating
planing or moulding tools. The spindles have horizontal and/or vertical axes which can be adjusted manually
or under power.
The machine can be fitted with additional work units such as universal spindle(s) or glass bead cutting unit(s)
3.2.2
universal spindle
work unit, the position of which can be changed manually or under power so as to allow it to work at different
positions around the work-piece
3.2.3
glass bead cutting unit
work unit fitted with a tool, usually a saw blade, to cut out a glass bead from the machined profile of the work-
piece (e.g. see figure 1)
prEN 12750:2008 (E)
Key
1 glass bead saw-blade
2 bed ledge separator
3 anti-kickback finger
4 pressure device
5 guiding channel for glass bead ledge
6 glass bead ledge
7 work-piece
8 fixed safeguard for glass bead saw blade
9 automatic guard for glass bead saw blade
10 fence
11 feed direction
Figure 1 — Example of a glass bead cutting unit
3.2.4
hydraulic tool fixing device
device for clamping the tool to the spindle using hydraulic pressure
3.2.5
integrated feed on four sided moulding machines
feed mechanism for the work-piece or tool which is integrated with the machine and where the work-piece or
machine element with incorporated tool are held and controlled mechanically during the machining operation
3.2.6
loading of four sided moulding machines
manual or automatic placing of the work-piece on to a carriage, magazine, lift, hopper, movable bed, conveyor
or the presentation of the work-piece to an integrated feed device
prEN 12750:2008 (E)
3.2.7
climb cutting
when the relative rotational direction of the tool cutting point is in the same direction as the feed
3.2.8
cutting area of the tool
area of the tool involved in the cutting process
3.2.9
non-cutting area of the tool
area of the tool which is not involved in the cutting process
3.2.10
ejection
uncontrolled movement of the work-piece or parts of it or part of the tool from the machine during processing
3.2.11
kickback
unexpected sudden movement of the work-piece or parts of it opposite to the direction of feed during
processing
3.2.12
anti-kickback device
device which either reduces the possibility of kickback or arrests the motion of the work-piece or parts of it
during kickback (example see key 5 in Figure 1)
3.2.13
catching fingers device
device designed to prevent the ejection of divided work-pieces (example see Figure 2)

Key
1 catching finger
2 work-piece
3 feed direction
Figure 2 — Example of a catching fingers device
prEN 12750:2008 (E)
3.2.14
speed range
range between the lowest and the highest rotational speed for which the spindle or tool is designed to operate
3.2.15
run-up time
time elapsed from the actuation of the start control device until the spindle reaches the intended speed
3.2.16
run-down time
time elapsed from the actuation of the stop control device up to spindle standstill
3.2.17
pressure sensitive protective equipment (PSPE)
mechanically actuated assembly of devices and/or components working together for protective tripping or
presence-sensing purposes comprising as a minimum:
- one or more sensing elements;
- a control unit (where necessary);
- one or more output signal switching device(s).
Safety-related control system associated with the PSPE or the PSPE itself can further include a secondary
switching device, start interlock, re-start interlock etc.
NOTE For example pressure sensitive bars
3.2.18
complete enclosure
total machine enclosure primarily designed for noise attenuation and to permit the operator to move around
freely within it and where all machine setting and adjustments are available inside it. The enclosure contains
openings for work-piece loading and unloading and access is normally through a door/opening
3.2.19
integrated enclosure
safeguarding system consisting of a combination of fixed and moveable guards as integral part of the machine
which provides a measure of sound attenuation and where certain setting adjustments may be available
outside it
3.2.20
machine actuator
power mechanism used to effect motion on the machine
3.2.21
stationary machine
machine designed to be located on or fixed to the floor or other parts of the structure of the premises
3.2.22
safety function
function of the machine whose failure can result in an immediate increase of the risk(s) (EN ISO 12100-1:2003,
3.28)
prEN 12750:2008 (E)
3.2.23
safety-related part of a control system (SRP/CS)
part of a control system that responds to safety-related input signals and generates safety-related output
signals (EN ISO 13849-1:2006, 3.1.1)
3.2.24
safety-related PLC
programmable logic controller dedicated to safety-related application designed in the required category
according to EN ISO 13849-1:2006
3.2.25
safety-related electrical control system (SRECS)
electrical part of a control system whose failure can result in a immediate increase of the risk(s) (EN
62061:2005, 3.2.4)
3.2.26
performance level (PL)
discrete level used to specify the ability of safety–related parts of control systems to perform a safety function
under foreseeable conditions (EN ISO 13849-1:2006, 3.1.23)
3.2.27
monitoring system
system with a safety function which ensures that a protective measure is initiated if the ability of a component
or an element to perform its function is diminished or if the process conditions are changed in such a way that
hazards are generated (EN ISO 13849-1:2006, 3.1.21)
3.2.28
safety-related application software (SRASW)
software specific to the application, that is implemented by the machine manufacturer, generally containing
logic sequences, limits and expressions that control the appropriate inputs, outputs, calculations and decisions
necessary to meet SRP/CS requirements (EN ISO 13849-1:2006, 3.1.36)
3.2.29
Safety-related embedded software (SRESW)
firmware
system software
software that is part of the system supplied by the control manufacturer and is not accessible for modification
by the user of the machine (EN ISO 13849-1:2006, 3.1.37)
NOTE 1 Embedded software is usually written in FVL.
NOTE 2 For example the operating system of a speed monitoring device.
3.2.30
diagnostic coverage
DC
measure of the effectiveness of diagnostics, which may be determined as the ratio between the failure rate of
detected dangerous failures and the failure rate of total dangerous failures (EN ISO 13849-1:2006, 3.1.26)
NOTE Diagnostic coverage can exist for the whole or parts of a safety-related system. For example, diagnostic
coverage could exist for sensors and/or logic system and/or final elements.
3.2.31
information from the supplier
statements, sales literature, leaflets or other documents where a manufacturer (supplier) declares either the
compliance of the characteristics of e.g. a material or product or the conformity of a material or a product to a
relevant standard.
prEN 12750:2008 (E)
4 List of significant hazards
This clause contains the significant hazards, hazardous situations and events (see EN 1050:1996), as far as
they are dealt with in this document, identified by risk assessment as significant for the machines as defined in
the scope and which require action to eliminate or reduce the risk. This document deals with these significant
hazards by defining safety requirements and/or measures or by reference to relevant standards.
These hazards are listed in Table 1 in accordance with Annex A of EN 1050:1996.
prEN 12750:2008 (E)
Table 1 — List of significant hazards
Relevant
No Hazards, hazardous situations and hazardous EN ISO 12100 clause(s) of
events this document
Part 1: Part 2:
2003 2003
1 Mechanical hazards due to machine parts or work-pieces due to
a) shape; 4.2 4.2.1, 5.3.3, 5.3.5,
4.2.2, 5 5.3.6, 5.3.7,
5.3.8, Annex C
b) relative location; 5.2.2, 5.2.3,
5.2.9, 5.3.3,
5.3.5
c) mass and stability (potential energy of elements which 5.2.9, 5.2.12,
may move under the effect of gravity); 5.3.1, 5.3.6,
5.3.9
d) mass and velocity (kinetic energy of elements in 5.2.6, 5.2.7,
controlled or uncontrolled motion); 5.2.9
e) mechanical strength. 5.3.3, 5.3.5,
5.3.6, 5.3.8,
Annex E,
Annex F
- accumulation of energy inside the machinery by:
g) liquids and gases under pressure;  5.4.7, 5.4.8
1.1 Crushing hazard 4.2.1 5.3.7.1, 5.3.7.2
1.2 Shearing hazard 5.3.7.1, 5.3.7.2
1.3 Cutting or severing hazard 5.3.7.1, 5.3.7.2
1.4 Entanglement hazard 5.3.7.1, 5.3.7.2,
5.3.7.3
1.5 Drawing-in or trapping hazard 5.3.7.1, 5.3.7.2,
5.3.7.3
1.6 Impact hazard 5.3.5
1.7 Stabbing or puncture hazard 5.3.7, 6.3
1.9 High pressure fluid injection or ejection hazard 4.2.1 4.10 5.2.13
2 Electrical hazards due to:
2.1 Contact of persons with live parts (direct contact) 4.3 4.9, 5.5.4 5.4.4
2.2 Contact of persons with parts which have become live 4.3 4.9 5.4.4
under faulty conditions (indirect contact)
4 Hazards generated by noise, resulting in:
Hearing loss (deafness), other physiological disorders 4.2.2, 5
4.1 4.5 5.4.2
(loss of balance, loss or awareness)
4.2 Interference with speech communication, acoustic 5.4.2
signals
prEN 12750:2008 (E)
Table 1 — List of significant hazards (concluded)
Relevant
No Hazards, hazardous situations and hazardous EN ISO 12100 clause(s) of
events this document
Part 1: Part 2:
2003 2003
7 Hazards generated by materials and substances (and their constituent elements) processed or used by
the machinery
7.1 Hazards from contact with or inhalation of harmful fluids 4.8 4.3b), 4.4 5.4.3
and dusts
7.2 Fire 4.8 4.4 5.4.1, 5.4.10
8 Hazards generated by neglecting ergonomic principles in machinery design related to
8.1 Unhealthy postures or excessive effort 4.9 4.7, 4.8.2, 5.2.2, 5.2.6
4.11.12,
5.5.5, 5.5.6
8.2 Hand-arm or foot-leg anatomy 4.9 4.8.3 5.4.5
8.4 Local lighting 4.8.6 6.3
8.6 Human error, human behaviour 4.9 4.8, 4.11.8, 5.2.6, 6.3
4.11.10,
5.5.2, 6
8.7 Design, location or identification of manual controls 4.8.7, 5.2.2, 5.2.6
4.11.8
8.8 Design or location of visual display units 4.8.8, 6.2 5.2.2
9 Combination of hazards 4.11 5.2.6
10 Unexpected start-up, unexpected overrun/overspeed (or any similar malfunction) from:
10.1 Failure/disorder of the control system 4.11, 5.5.4 5.2.13
10.2 Restoration of energy supply after an interruption 4.11.4 5.2.12
10.3 External influences on electrical equipment 4.11.11 5.4.9, Annex B
10.5 Errors in the software 4.11.7 Annex B
10.6 Errors made by the operator (due to mismatch of 4.9 4.8, 4.11.8, 5.4.5, 5.4.11,
machinery with human characteristics and abilities, see 4.11.10, 6.3
8.6) 5.5.2, 6
11 Impossibility of stopping the machine in the best 4.11.1, 5.2.4, 5.2.5
possible conditions 4.11.3,
5.5.2
12 Variations in the rotational speed of tools 4.2.2, 4.3 5.2.7
13 Failure of the power supply 4.11.1,
5.2.12
4.11.4
14 Failure of the control circuit 4.11, 5.5.4 5.2.13, Annex
B
15 Errors of fitting 4.7, 6.5 5.4.12
16 Break-up during operation 4.2.2 4.3 5.3.2
17 Falling or ejected objects or fluids 4.3, 4.10 5.3.5
18 Loss of stability / overturning of machinery 5.2.6 5.3.1

prEN 12750:2008 (E)
5 Safety requirements and/or measures
5.1 General
The machine shall comply with the safety requirements and/or protective measures of Clause 5.
NOTE 1 In addition, the machine should be designed according to the principles of EN ISO 12100-1:2003 and EN ISO
12100-2:2003 for hazards relevant but not significant, which are not dealt with by this document (e.g. sharp edges of the
machine frame).
NOTE 2 For guidance in connection with risk reduction by design see Clause 4 of EN ISO 12100-2:2003 and for
safeguarding measures see Clause 5 of EN ISO 12100-2:2003.
5.2 Controls
5.2.1 Safety and reliability of control systems
5.2.1.1 General
For the purpose of this document safety-related parts of a control system (SRP/CS) start at the point where
the safety-related input signals are initiated (including e.g. the actuating cam and the roller of the position
switch) and end at the output of the power control elements (including, for example, the main contacts of a
contactor). For the implementation of any safety-related function the appropriate requirements of EN ISO
13849-1:2006 shall apply.
Safety-related parts of the control system of the machine are those concerning the functions listed in Table 2.
The design of the safety-related control system shall be such as to achieve the machine safety functions
required in this document.
NOTE If monitoring systems are used for diagnostics, they are also considered as SRP/CS.
5.2.1.1.1 Performance level (PL)
For the safety-related parts of the control system (SRP/CS) with the functions listed in column 1 of Table 2 the
minimum performance level (see EN ISO 13849-1:2006, 4.5) shall be in accordance with column 2 of Table 2.
Alternatively, where the estimation of the PL is not possible due to lack of data, categories shall be in
accordance with column 3 of Table 2.
prEN 12750:2008 (E)
Table 2 — Safety functions, Performance Levels (PL) and categories
Function
Performance Category Relevant Clause(s) of this
level (PL) document
starting c) 1 or 3 5.2.3
prevention of unexpected start-up c) 1 or 3 5.2.8, 5.2.12, 5.2.13
normal stopping c) 1 or 3 5.2.4
emergency stop c) 1 or 3 5.2.5
interlocking of guards for drives c) 1, 2 or 3 5.3.7.4
interlocking of guards for tools c) 1 or 3 5.3.7.1
interlocking of functions c) 1 or 3 5.2.3, 5.2.4, 5.2.5, 5.2.6,
5.2.8, 5.2.9, 5.2.10, 5.3.5,
5.3.7.1, 5.3.7.2
In setting mode: c) 1 or 3 5.2.9, 5.2.10
initiation of powered adjustment for positioning
the spindles, spindle units, feed roller height,
fences, table height, chip breaker and pressure-
shoes
powered adjustment for positioning the b) B 5.2.10
spindles, spindle units, feed roller height,
fences, table height, chip breaker and pressure-
shoes
mode selection c) 1 or 3 5.2.6
hold-to-run control c) 1 or 3 5.2.6, 5.2.9, 5.2.10
selection of direction of rotation of spindles b) B 5.2.8
mechanical operated trip device c) 1 or 3 5.3.7.2
braking system b) B, 1, 2 or 3 5.3.4
monitoring of the tool speed if realized by use c) 2 or 3 5.2.7.3
of frequency inverter
NOTE The average probability of a dangerous failure per hour for the different performance levels is described in
Table 3 of EN ISO 13849-1:2006.
Where more than one category is indicated in Table 2 then the relevant clause of this document specifies
which category is required, depending on the type of control system technique used (e.g. electro-mechanical,
electronic or hydraulic and its possible combinations) and according to the risk analysis.
If on machines designed for different modes of operation the same SRP/CS is used for all safety functions in
the different modes the SRP/CS shall meet the requirements of the highest PL of the different modes.
Category 1 in electric control systems is only achieved by using hardwired components.
Where category B is required all other categories also fulfil the requirement. Where category 1 is required
categories 3 and 4 also fulfil the requirement. Where category 2 is required categories 3 and 4 also fulfil the
requirement. Where category 3 is required category 4 also fulfils the requirement.
prEN 12750:2008 (E)
Where a combination of SRP/CS is used the overall PL identified according 6.3 of EN ISO 13849-1:2006 shall
comply at least with the PL required in Table 2.
SRP/CS for which a special standard exists shall fulfil all requirements of this document.
Verification: By checking the relevant drawings and/or circuit diagrams and inspection of the machine.
5.2.1.1.2 Fault detection and fault reaction for safety-related parts of the control system (SRP/CS)
Unless otherwise specified in the relevant clause of this document, fault detection and fault reaction functions
shall be in accordance with the requirements in 6.2.4 to 6.2.7 of EN ISO 13849-1:2006.
Verification: By checking the relevant drawings and/or circuit diagrams and inspection of the machine.
5.2.1.1.3 Environmental conditions
For all components exposed to environmental conditions, e.g. dust and/or gases, these conditions shall be
taken into account.
Unless safety-related electronic parts of the control system (SRP/CS) being part of a component for which a
special standard exists they shall fulfil the environmental req
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