Banner EZ-SCREEN­ Safety Light Curtain Systems - Manual (Page 18)

Figure 4. An example of supplemental safeguarding on page 17 shows an example of supplemental safeguarding inside a robotic work
cell. The EZ-SCREEN Type 2, in conjunction with the hard guarding, is the primary safeguard. 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 reset switch (i.e., behind
the robot and the conveyor). Additional supplemental safeguarding may be required to prevent clearance or trapping hazards (for exam-
ple, the safety mat as an area guard between the robot, the turntable, and the conveyor).
WARNING: The Hazard Must Be Accessible Only through the Defined Area
The installation of the EZ-SCREEN Type 2 System must prevent any individual from reaching around, un-
der, over or through the defined area and into the hazard without being detected. Mechanical barriers (for
example, hard 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.
Other Considerations
Reset Switch Location
A key-actuated reset switch provides some operator or supervisory control, as the key can be removed from the switch and taken into the
guarded area. However, this does not prevent unauthorized or inadvertent resets due to spare keys in the possession of others, or addi-
tional personnel entering the guarded area unnoticed. When considering where to locate the reset switch, follow the guidelines in the
Warning below.
WARNING: Reset Switch Location
When considering where to locate the reset switch, you must follow the guidelines outlined in this section.
If any areas within the guarded area are not visible from the reset switch, additional safeguarding must be
provided, as described by the ANSI B11.19 series or other appropriate standards.
Failure to follow these instructions could result in an increased risk of harm
All reset switches must be:
• Outside the guarded area
• Located to allow the switch operator a full, unobstructed, view of the entire guarded area while the reset is performed
• Out of reach from within the guarded area
• Protected against unauthorized or inadvertent operation (such as through the use of rings or guards).
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 can not be observed from
the reset switch location, additional supplemental safeguarding must be used: at a minimum, visual and audi-
ble warnings of machine start-up.
EZ-SCREEN® Type 2 Light Screen Instruction Manual
18 www.bannerengineering.com - tel: 763-544-3164 122452 rev. B