Banner EZ-SCREEN­ Safety Light Curtain Systems - Manual (Page 22)

20
P/N 68413 rev. A
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
EZ-SCREEN Point
Instruction Manual
System Installation
Supplemental safeguarding is used to make the hazard point
accessible only through the light grid, per ANSI/RIA R15.06. This
means that mechanical barriers (such as screens or bars) or
supplemental safeguarding must be installed, wherever needed,
to prevent any person from entering into or remaining in the
hazard area undetected . The use of mechanical barriers for this
purpose is called hard guarding (see the Warning at left and
Figure 3-7).
There must be no gaps between the hard guarding and the
edges of the light grid (that is, the EZ-SCREEN emitter or
receiver). Also, OSHA specifies a relationship between the
distance of the hard guard barrier from the point of operation
and the maximum allowable size of openings in that barrier
(see OSHA 1910.217, Table O-10). Openings in the hard guard
material must meet OSHA or other applicable criteria .
Figure 3-7 shows an example of supplemental safeguarding
inside a robotic work cell. The EZ-SCREEN (emitter and
receiver) in conjunction with the hard guarding (i.e. the wall
and the fencing) is the primary safeguarding. Supplemental
safeguarding (such as a horizontal mounted safety light screen
as an area guard) is required in areas that can not be viewed
from the EZ-SCREEN Reset switch (i.e. behind the robot and
the conveyor). Additional supplemental safeguarding may be
required by the requirements of relevant standards, such as
preventing clearance or trapping hazards as described by ANSI/
RIA R15.06 (e.g. the safety mat as an area guard between the
robot, the turntable, and the conveyor).
Figure 3-7. Supplemental safeguarding
WARNING . . .
The Machine Hazard
Must Be Accessible Only Through the
Light Beam(s)
Mechanical barriers (“hard guarding”) or supplemental
safeguarding, as described by the ANSI B11 series of safety
requirements or other appropriate standards, must be installed
wherever needed to prevent any person from:
• Reaching around, under, or over the light grid and accessing
the hazard, and
• Entering or remaining anywhere within the guarded area
without being detected and a stop command being issued to
the guarded machine (see ANSI/RIA R15.06).
ACCESS-GUARD
Area Guarding
Hard
Guarding
Hard
Guarding
Hard Guarding
Hazard
Area
Guarding
EZ-SCREEN
Reset Switch