Mechanical Installation; Mechanical Installation Considerations; Calculating The Safety Distance (Minimum Distance) - Banner EZ-SCREEN Instruction Manual

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EZ-SCREEN LP Limited Function Safety Light Screen

3 Mechanical Installation

The EZ-SCREEN LP system performance as a safety guarding device depends on:
• The suitability of the application
• The proper mechanical and electrical installation and interfacing to the guarded machine
WARNING: Read this Section Carefully Before Installing the System
If all mounting, installation, interfacing, and checkout procedures are not followed properly, the Banner
device cannot provide the protection for which it was designed. The user has the responsibility to
ensure that all local, state, and national laws, rules, codes, or regulations relating to the installation and
use of this control system in any particular application are satisfied. Ensure that all legal requirements
have been met and that all technical installation and maintenance instructions contained in this manual
are followed.
The user has the sole responsibility to ensure that this Banner device is installed and interfaced to the
guarded machine by Qualified Persons
regulations.

3.1 Mechanical Installation Considerations

The two primary factors that influence the layout of the EZ-SCREEN LP system mechanical installation are the Safety
Distance (Minimum Distance) (see
supplemental safeguarding/eliminating pass-through hazards (see
12). Other considerations include:
• Emitter and Receiver Orientation
• Adjacent Reflective Surfaces
• Use of Corner Mirrors
• Installation of Multiple Systems
WARNING: Position Components Carefully
The emitter and receiver must be positioned such that the hazard cannot be accessed by
reaching over, under, around, or through the sensing field. Additional and supplemental guarding
may be required.

3.1.1 Calculating the Safety Distance (Minimum Distance)

Safety Distance (Ds), also called Minimum Distance (S), is the minimum distance required between the defined area and
the closest reachable hazard point. The distance is calculated so that when an object or a person is detected (by blocking a
sensing beam), the EZ-SCREEN LP sends a stop signal to the machine, causing it to stop by the time the object or person
can reach any machine hazard point.
The distance is calculated differently for U.S. and European installations. Both methods take into account several factors,
including a calculated human speed, the total system stopping time (which itself has several components), and the depth
penetration factor. After the distance has been determined, record the calculated distance on the Daily Checkout Card.
WARNING: Safety Distance (Minimum Distance)
The Banner emitters and receivers must be mounted at a distance from the nearest hazard such that an
individual cannot reach the hazard before cessation of the hazardous motion or situation. This distance
can be calculated using the formulas in this section, as described by ANSI B11.19 and ISO 13855, and
must be greater than 100 mm (4 in) regardless of calculated value. Failure to establish and
maintain the safety distance (minimum distance) may result in serious bodily injury or
death.
Reduced Resolutions increases Dpf (or C). Increase the depth penetration factor to calculate
proper minimum distance whenever Reduced Resolution is used. Always turn Reduced
Resolution Off when the larger minimum object detection size is not required.
2
A person who, by possession of a recognized degree or certificate of professional training, or who, by extensive knowledge, training and
experience, has successfully demonstrated the ability to solve problems relating to the subject matter and work.
10
2
, in accordance with this manual and applicable safety
Calculating the Safety Distance (Minimum Distance)
www.bannerengineering.com - Tel: 763.544.3164
on page 10) and the
Reducing or Eliminating Pass-Through Hazards on page