Important:
Resetting a safeguard must not initiate hazardous motion. Safe work procedures require a
start-up procedure to be followed and the individual performing the reset to verify that the entire hazardous
area is clear of all personnel before each reset of the safeguard is performed. If any area cannot be
observed from the reset switch location, additional supplemental safeguarding must be used: at a
minimum, visual and audible warnings of machine start-up.
3.8 Supplemental Safeguarding
Position the scanner components so an individual cannot reach through the defined area and access the hazard point before
the machine has stopped.
Additionally, the hazard cannot be accessible by reaching around, under, or over the defined area. To accomplish this, install
supplemental guarding (mechanical barriers, such as screens or bars), as described by ANSI B11 safety requirements or
other appropriate standards. Access must only be possible through the defined area of the Scanner or through other
safeguarding that prevents access to the hazard.
The mechanical barriers used for this purpose are typically called hard guarding; there must be no gaps between the hard
guarding and the defined area. Any openings in the hard guarding must comply with the safe opening requirements of ANSI
B11 or other appropriate standard.
WARNING: The Hazard Must Be Accessible Only through the Sensing Field
The installation of the SX must prevent any individual from reaching around, under, over or through the
sensing field and into the hazard without being detected. Mechanical barriers (for example, hard (fixed)
guarding) or supplemental safeguarding may be required to comply with this requirement, and is
described by ANSI B11.19 safety requirements or other appropriate standards.
Failure to follow these
instructions could result in serious injury or death.
Figure 29. Supplemental safeguarding inside a robotic work cell
Hard
Guarding
Hard
Guarding
Scanner
(protective field #1)
Scanner
(protective
field #2)
Opening
Robot
Light Screen
Emergency Stop/Reset
D
S
Area
Guarding
Turn-
Table
Area
Guarding
This shows an example of supplemental safeguarding inside a robotic work cell. The safety light screen, in conjunction with
the hard guarding, is the primary safeguard. Supplemental safeguarding (such as scanners used as area guards) is required
in areas that cannot be viewed from the reset switch (for example, behind the robot and the conveyor). Additional
supplemental safeguarding may be required to prevent clearance or trapping hazards (e.g., the safety mat as an area guard
between the robot, the turntable, and the conveyor).
3.9 Mobile Applications
The SX can protect individuals entering an area with a variable or moving hazard, protect individuals and objects located
within a mobile vehicle’s path, and protect the mobile vehicle and its load from collisions.
Only use the SX on vehicles with electrical drives (e.g. servo) or electrically controlled drive and braking. The Safety Zone
must be configured so that the mobile vehicle can come to a complete stop before a collision can occur. If it is not possible to
completely safeguard the vehicle, including trailers, protruding or overhanging loads, etc., during the full length of travel,
including curves, use additional safeguarding, such as additional SX or bumper/edge switches.
SX Safety Laser Scanner
38
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