Safety in system Protection for man and machine

Safety in system: Protection for man and machine

more than 50 years of experience more than 20. 000 different products more than 200 billion WON turnover more than 1. 200 employees in more than 20 countries worldwide 03. 2008 / JSCH 2

Safety Switchgears for safety related tasks in all branches of mechanical engineering Automation Lift Switching components and switchgear for lifts – from position and door contact switches to non-contact positioning systems Electrical and electronic switches and sensors as well as actuating and indicating elements in this particular field 03. 2008 / JSCH 3

ELAN, Wettenberg SCHMERSAL, Wuppertal 03. 2008 / JSCH 4

03. 2008 / JSCH 5

Product portfolio Overview 03. 2008 / JSCH 6

Safety technology Devices and systems to protect men and machine emphasing to protect operators against hazardous machine movements. • Interlocking devices with/without guard locking Safety switches with separate actuator Safety magnet switches Plastic and metal encapsulated safety guard locks Trapped-key systems Position switches with safety function Contactless safety switches and guard locks with inductive working principle Hinge switches 03. 2008 / JSCH 7

Safety technology • Optoelectronic protective devices Safety laser scanner Safety light curtains Safety light grids with integrated muting function Safety light barriers – control category 4 Safety light barriers – control category 2 • Tactile protective devices/Two-hand controls (safeguards with locality fixation) Safety edges for corner applications Safety bumpers Safety mats Two-hand control panels 03. 2008 / JSCH 8

Safety technology • Command devices with personal protection function Emergency-stop equipment Enabling switches Pull-wire switches with convenient and wiretensioning device Safety foot switches Cable-less control stations with safety function • Safety-related control devices, safety-controllers and safety-bussystems Safety monitoring modules AS-Interface Safety at Work monitor ESALAN Safety. Controller Standstill monitors and delay timer ESALAN-Compact safety control units 03. 2008 / JSCH 9

Automation technology Electrical and electronic switching devices and sensors with emphasis positioning and end position entry • Standard and substandard position switches, reed switches and sensors Standardized position switches with metal- and plastic-encapsulated housings Multi-position switches Reed switches Proximity switches Sensors with increased EMC-resistance 03. 2008 / JSCH 10

Automation technology • Limit switches / special executions Heavy duty limit switches Gearbox switches Belt off-track running switches Position switches Micro switches • Command signalling devices Heavy duty devices Hygienic-conform devices V 4 A-command housings Design devices Foot pedal switches Grab wire switches 03. 2008 / JSCH 11

Automation technology Switches for special applications • Ex-proofed switches for safety-related and operational tasks Ex-proof for ATEX-zones 2 and 22 • Switches for hygienic- and contamination-critical tasks 03. 2008 / JSCH 12

Lift technology Electrical and electronic switching devices and sensors with emphasis positioning and end position entry • Traditional switches Door contacts with positive break Magnetic reed switches Position switches Floor, adjustment and unified switches Door locks • Ultrasonic-based positioning system USP 03. 2008 / JSCH 13

Catalogues / brochures with further information (extract) 03. 2008 / JSCH 14

Safety on Machinery Introduction

Requirements on Safety of Machinery • Subject of national law with different requirements, may be in form, may be in content • Different requirements in e. g. China, USA, European Community etc. • Requirements can be addressed to machine manufactures or to machine users or to both of the parties • E. g. European Community: Addressed (first of all) to machine manufacturers by so-called EC’s Council Directive • Although meanwhile there is a lot of International Standardization 03. 2008 / JSCH 16

Function of International Standardization • Contribution to a mutual (global) understanding of the contents of requirements (Global Regulatory Product Compliance) • But – may be – there are still additional dissent national requirements • Further: Formalities of bringing into circulation may be still different, e. g. mandatory and non-mandatory product certifications 03. 2008 / JSCH 17

International Standardization • Made by ISO (International Standardization Organization); standards of basics, safety aspects, safeguards of machinery • Made by IEC (International Electrical Committee); standards of safety-related electrical matters • Replacing more and more (but not yet completely) other (national or regional) standards (e. g. CEN, CENELEC etc. ) 03. 2008 / JSCH 18

Harmonised Standard for Machines (EC) Basic standards Type A Specialist basic standards Further differentiation Type B 1 Type B 2 Safety aspects overaching products Product specific safety equipment Specialist standards Type C Type A Contain basic terms, design principles and general aspects which apply to all machines, linked machines, parts of machines and safety components due to the field of application mentioned in the Machine Directive. Type B 1 Contain definite statements and possible solutions to general level safety aspects dealt with in the basic standard, e. g. safety distances, surface temperature, noise, safety related control systems. Type B 2 Contain definite statements or possible solutions to safety-related fixtures, e. g. two-handcontrols, interlocking devices, and separating guard devices. Type C Contain definite requirements or protective maesures for typical hazards which arise with a machine or group of machines, e. g. machine tools, rubber and plastic processing machines, packaging machines, machines for foodstuffs, woodworking machines, construction machines. 03. 2008 / JSCH 19

(Harmonised) Norms Reference for Schmersal products EC Directives • Machinery Directive • Low Voltage Directive • Electromagentical Compliance The intention of the hamonisation concept is that EC Directives and their annexes should only contain essential safety requirements. The binding, but normally very general essential safety Requirements, should be supplemented by harmonised, nonbinding European standards. Implementation in national law • EN 954 -1 Safety of machinery - Safety-related parts of control systems • EN 1088 Safety of machinery - Interlocking devices associated with guards • IEC 60947 Low-voltage switchgear and controlgear 03. 2008 / JSCH 20

Risk assessment to EN 954 -1 ISO EN 13 849 -1: 2006 03. 2008 / JSCH 21

Safety components Today‘s most popular protective devices

Advantages of Safety Components • Especially designed to provide a safety function, e. g. functional safety • Fulfilling the requirements of the relevant B 2 -standards • Tested and certified by Notified Bodies • Brought into circulation with a lot of background information and consultancy on request 03. 2008 / JSCH 28

Devices to protect against hazardous movements of machinery (and similar hazards) • Interlocking devices associated with guards • Active Optoelectronic Protective Devices (AOPD’s) • Tactile protective devices/Two-hand controls • Logic devices for SRP/CS • Safety devices for special applications and machine modes • … 03. 2008 / JSCH 31

Safety solutions for applications with immediate stop TYPE 1 Safety position switches for sliding doors TYPE 2 Safety switch with separated actuatorfor hinged and sliding doors

Safety solutions for applications with immediate stop Safety switches for flaps and hinged doors Safety switches for hinged and slided doors as well as flaps

Safety solutions for applications with delayed stop TYPE 2 Safety solenoid door interlocks for hinged and sliding doors

Interlocking devices associated with guards

Protective devices Equipment to protect against harzardous movements and other hazards (functional machine safety) a) Fixed guards b) Moveable guards c) d) Active Optoelectronic Protective Devices (AOPD‘s) (Protective devices with approximation function) d) Protective devices with mobility fastening (e. g. Two-hand-control-devices) e) Tactile protective devices f) Rotective devices for special machine modes g) Safety related parts of control systems h) E-stop devices 03. 2008 / JSCH 37

Guards • Most common protective measure on safety of machinery • Observe EN 953 – General requirements for the design and obstruction of guards (fi xed and moveable). • Guards are divided into - fixed guards - moveable guards • Double protection - Protection (1) against hazardous movements of machinery - Protection (2) against parts flying away, agressive liquids and other risks • Further feature: Mechanical barrier 03. 2008 / JSCH 38

Guards Interlocking devices Safety switches with separate actuators are suitable for sliding, hinged and particularly removable safety guards, which need to be closed to ensure the necessary operational security. They are also suitable for fitting on profile sections and existing equipment. 03. 2008 / JSCH 40

Guards Interlocking devices • Equipment must fullfil EN 1088 • The devices ensure that hazardous machine functions cannot be performed if the safety guard is open. • If safety switches are used (without guard locking), a stop instruction is given if the moveable guard is opened during a hazardous machine function. • If interlocking devices are used (with guard locking), the moveable guard is kept locked until such times as there is no longer a risk of injury from the hazardous machine function. • In both cases, closing the moveable guard should not initiate hazardous machine function. • Initiation of hazardous machine function must be done by a separate / intentionally made instruction (= reset push button) – exceptions have to be judged carefully. 03. 2008 / JSCH 41

Guards Interlocking devices - Working principle Safeguard open Safeguard closed 03. 2008 / JSCH 42

Guards Interlocking devices with guard locking A safety door interlock, i. e. an interlocking device with guard locking and delayed unlocking or release, must be used if the time a hazardous movement takes to stop is greater than the time a person requires to reach the danger zone. 03. 2008 / JSCH 43

Guards Interlocking devices with guard locking • Solenoid locking principle for safety applications • Always in conjunction with a guard door monitor and a fail-safe standstill or delay time monitor • Cycle run-down applications e. g. welding robots, CNC centres • Ensure that removable guarding devices, such as grids, hoods or doors, cannot be opened until hazardous conditions (e. g. runningdown movements) have come to an end. 03. 2008 / JSCH 44

Guards Interlocking devices with guard locking A spring applied interlocking device is locked by means of spring force and unlocked by means of electromagnetic force in energised state. If the supply voltage is interrupted, the moveable guard will still maintain ist protective effect. Safeguarding equipment closed (Power to unlock) Safeguarding equipment opened The springs in this design are safety springs. 03. 2008 / JSCH 45

Guards Interlocking devices with guard locking The electromagnet of the versions locked by magnetic force actively locks the device in energised state and unlocks it by spring force. Safeguarding equipment closed (Power to lock) Safeguarding equipment opened 03. 2008 / JSCH 46

Guards Interlocking devices with guard locking In order to be able nevertheless to open a moveable guard locked by spring force in deenergised state, all versions can be provided with an optional auxiliary release feature. The actuation of an auxiliary release function should only be possible with a tool, such as a special three-square socket wrench with which Elan interlocking devices can be opened and reset. 03. 2008 / JSCH 47

Joerg Schreiber Regional Sales Manager Asia K. A. Schmersal Gmb. H Industrielle Sicherheitsschaltsysteme Möddinghofe 30 D-42279 Wuppertal Telefon +49 202 6474 -887 Telefax +49 202 6474 -700 -887 Mobil +49 178 6474 -008 Email jschreiber@schmersal. com Internet http: //www. schmersal. com Thank you for your attention 03. 2008 / JSCH 48