Banner EZ-SCREEN­ Safety Light Curtain Systems - Manual (Page 21)

page 21
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
Installation and Alignment
EZ-SCREEN Grid
Instruction Manual
3.3.2 Supplemental Safeguarding
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 3-4).
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 3-4. An example of supplemental safeguarding
WARNING . . .
The Machine Hazard
Must Be Accessible
Only Through the
Light Grid
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).
!
Figure 3-4 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 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).