Motion Control & Drives


Rugged, cost-effective safety light curtain

April 2004 Motion Control & Drives

Banner Engineering is offering its EZ-Screen safety light screen system, a non-contact, point-of-operation machine guarding system. This new robust system is believed to be the industry's easiest to set up, align and operate, due to its excellent optical design, variety of sizes and resolutions, zone indicators, detailed diagnostics, and flexible mounting options. It is also believed to be the lowest cost system of its kind. The system also offers ample power - with a range up to 18 m and fast response times ranging from 9 to 40 ms.

"Especially significant to note, the two-piece EZ-Screen system does not require a separate control box, only a self-contained emitter and receiver pair," said Mike Carlson, technical manager for Banner's Safety Products. "This technology also eliminates the need for a synchronisation wire between the emitter and receiver because the system is synchronised optically - making it extraordinarily easy to install and operate," said Carlson. Despite its simplicity, this redundant microprocessor-controlled, self-checking design exceeds control reliability requirements and is certified per CE (Type 4/Category 4) and cULus (NIPF, UL61496, UL1998).

With systems available in two resolutions offering minimum object sensitivity of 14 mm or 30 mm, this compact package is suitable for finger or hand detection on smaller production machines, yet robust enough for large power presses. The addition of these hand protection EZ-Screen models round out the EZ-Screen safety light screen product family that includes grid and point style models for long-range (up to 70 m) perimeter guarding applications. The vibration-tolerant emitter and receiver circuitry, rugged aluminium housing, die-cast metal end caps, and acrylic lens cover result in long-lasting dependability, even in demanding industrial environments. It is also smaller than similar competitive systems, measuring just 45,2 mm by 36 mm.

Ease of set-up is achieved with a wide range of protective heights from 150 to 1800 mm, available in 150 mm increments. The emitter and receiver can be oriented on a vertical or horizontal plane or at any angle in between. Bracket choices provide the option of mounting the emitter and receiver from each end or by a convenient mounting channel on either side. Special brackets are also available for retrofitting older light curtains. Each system is pre-configured for most typical trip output, 'reach-through' applications. Trip output automatically resets when blocked beams are cleared. For 'pass-through' applications, Latch Output is easily configured via the access panel on the front of the receiver. Latching output requires a manual reset once the beams are cleared.

Extensive diagnostics further aid and simplify set-up, operation and maintenance. Both emitter and receiver feature highly visible diagnostic displays to provide continuous feedback of operating status, configuration and error conditions. The receiver features an easy to read seven-segment, three-digit display to indicate the number of beams interrupted or blocked and error codes if the system goes into lockout mode. The LED Zone Indicators on the receiver show when sections of the light screen are aligned or clear, or which areas are misaligned or blocked. DIP-switch selectable functions enable reduced resolution (Floating Blanking), Trip or Latch Output, external device monitoring (EDM), and Scan Code setting are accessible through the access cover.

The Banner EZ-SCREEN System is intended for point-of-operation machine guarding applications and other safeguarding applications, including area guarding when mounted horizontally and perimeter guarding utilising corner mirrors. A range of mounting brackets, stands and mirrors are available to facilitate virtually any conceivable mounting configuration. Typical applications include small assembly equipment, pick-and-place machines, moulding presses, packaging machinery, palletisers, roll formers, automated production equipment, robotic work cells, and power press applications.

The receiver has two solid-state safety outputs to control 24 V d.c. loads up to 0,5 A. For AC loads or loads requiring higher currents, an optional relay interface module is available, or discrete relays may be driven directly.



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