Safety light curtains XUSL range
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Safety light curtains XUSL range Catalogue Simply easy!

Safety detection solutions Safety light curtains. XUSL range ■ General □ Presentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2 □ Directives and standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2 □ Application sectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2 □ Safety rules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2 □ Positioning of safeguards . . . . . . . . . . . . . . . . . . . . . . . . . ....

Safety detection solutions Safety light curtains XUSL range Safety light curtains are electro-sensitive protective equipment (ESPE) designed to help protect people operating or working in the vicinity of machinery, by stopping the hazardous movement of parts as soon as one of the light beams is broken. In particular, they provide protection to help ensure the safety of personnel operating hazardous machinery (Annex IV of the Machinery Directive 2006/42/EC), but they are equally suitable for use with many other types of machine. They help to protect personnel while allowing free access to...

Safety detection solutions General (continued) Safety light curtains XUSL range Standard EN/ISO 13855 (1) defines the parameters for the positioning of safeguards. In particular: - the safety distance between the light curtain and the hazardous zone - the body approach speed - multi-beam devices - multiple single-beam light curtains (2, 3, or 4 beams) Hazardous zone Light beams Optical axis Calculation of the minimum safety distance S between the light curtain and the hazardous zone: S = K (t1 + t2) + C (general formula) S = minimum distance in mm K = approach speed of body (or part of the...

General (continued) Safety detection solutions Safety light curtains XUSL range Functions and definitions Resolution (R) This is the smallest diameter (of an object) that type 4 or type 2 safety light curtains are able to detect with absolute certainty. R R=P+E P: distance between the mid point of the 2 adjacent light beams E: diameter of the light beams R: resolution (or detection capability) Protected height (Hp) The protected height is the zone (or height) within which an object of diameter at least equal to the resolution (or detection capability) R is detected with absolute certainty....

Safety detection solutions General (continued) Safety light curtains XUSL range Functions and definitions (continued) Operation of a safety light curtain A safety light curtain is an optical protection system with infrared beams that provides protection for operators in the vicinity of hazardous zones. Any moving parts in this zone are stopped if at least one of the light beams is broken. The system comprises a transmitter and a receiver positioned facing each other and controlled by a microprocessor. They are not physically interconnected. A row of diodes in the transmitter emits infrared...

General (continued) Safety detection solutions Safety light curtains XUSL range Functions and definitions (continued) Risk assessment Risk assessment and risk reduction form part of an iterative process described in standards EN ISO 12100, IEC 61496-1, IEC 61508 and IEC 62061 (SIL), and EN/ISO 13849 (PL). There are different techniques for evaluating hazards, none of which can be considered as the best risk assessment method. The standards describe general principles, but do not specify precisely what to do in each case. For safety-related data, refer to the PFHd (Probability of dangerous...

General (continued) Safety detection solutions Safety light curtains XUSL range Functions and definitions (continued) Selecting the sensing distance Two different maximum sensing distances can be selected for each XUSL4 and XUSL2 safety light curtain: short and long. Both sensing distances can be selected by wiring. Sensing distance for XUSL2E safety light curtains Hand and body detection, standard sensing distance: Short sensing distance: 0…4 m. Long sensing distance: 0…12 m Sensing distance for XUSL4E safety light curtains Finger detection, standard sensing distance: Short sensing...

General (continued) Safety detection solutions Safety light curtains XUSL range Functions and definitions (continued) External device monitoring External device monitoring (EDM) is an important safety function. It monitors the interface between the safety light curtains and the protected machine: b to check that the external devices, such as contactors and relays, are responding correctly to the light curtain outputs b to detect any inconsistency between the two external control devices that could prevent a stop command from reaching the equipment connected downstream (e.g. power contactors...

General (continued) Safety detection solutions Safety light curtains XUSL range Functions and definitions (continued) Master/slave multi-segments for type 4 light curtains (XUSL4E only) Master/slave multi-segment light curtains - example of daisy-chained function: START WEAK Master (transmitter) Master (receiver) Slave 2 (transmitter) Slave 2 (receiver) Slave 1 (transmitter) Slave 1 (receiver) Multi-segments help protect multiple zones via a series connection. Only the first segment, known as the “master”, is connected to the control cabinet or enclosure. This master segment, which can...

Safety detection solutions General (continued) Safety light curtains XUSL range Installation precautions Reflective surface positioned sideways: Reflective surface The devices must be installed such that the transmitter and associated receiver are mounted facing each other and correctly aligned for both height and angle. The aperture angle of the optics and transmitter/receiver alignment tolerance are: α = 2.5° (type 4) α = 5° (type 2) Perimeter of hazardous zone P (1) Optical axis (2) Operating width of light beam (3) Reflective surface (4) Reflected beam (prevents light beam being broken)...