Banner EZ-SCREEN­ Safety Light Curtain Systems - Manual (Page 23)

page 23
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
Installation and Alignment
EZ-SCREEN Grid
Instruction Manual
3.3.4 Adjacent Reflective Surfaces
A reflective surface located adjacent to the light grid may deflect one or more
beams around an object in the light grid. In the worst case, such a situation may
allow an object to pass undetected through the light grid.
This reflective surface may result from shiny surfaces or glossy paint on the
machine, the workpiece, the floor or the walls.
Beams deflected by reflective surfaces are discovered by performing the trip test
portion of the final alignment procedure and the periodic checkout procedures
(Sections 3.6 and 6). To eliminate problem reflections:
• If possible, relocate the sensors to move the beams away from the reflective
surface(s), being careful to maintain adequate separation distance.
• Otherwise, if possible, paint, mask or roughen the shiny surface to reduce its
reflectivity.
• Where these are not possible (as with a shiny workpiece), include a means of
restricting the receiver’s field of view or the emitter’s spread of light in the
sensor mounting.
• Repeat the trip test to verify that these changes have eliminated the problem
reflection(s). If the workpiece is especially reflective and comes close to the
light grid, perform the trip test with the workpiece in place.
WARNING . . .
Avoid Installation Near
Reflective Surfaces
Avoid mounting the light grid near
any reflective surfaces. A
reflective surface located nearby
may reflect light around an object
or person within the light grid,
preventing its detection by the
light grid. This possibility is
detected during the trip test.
Failure to prevent reflection
problems will result in incomplete
guarding; serious bodily injury or
death could result.
!
Emitter Receiver
Operating
Range (R)
d
d Do not position
reflective surfaces
within the shaded area
Short-Range Models
Operating Range 0.8 to 3 meters (2.6' to 10'): d = 131 mm (5.2")
Operating Range 3 to 20 meters (10' to 65'): d = 0.0437 x R (meters or feet)
Long-Range Models
Operating Range 15 to 70 meters (49' to 230'): d = 0.0437 x R (meters or feet)
Figure 3-6. Adjacent reflective surfaces