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

16
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
3.2 Security Protocol
Certain procedures for installing, maintaining and operating
the EZ-SCREEN Point system must be performed by either
Designated Persons or Qualified Persons .
A Designated Person is identified and designated in writing,
by the employer, as being appropriately trained and qualified
to perform the specified checkout procedures on the EZ-
SCREEN system. A machine operator so designated may be a
Designated Person. The Designated Person is empowered to:
• Perform manual resets and hold possession of the reset key,
and
• Perform the Daily Checkout Procedure (see Section 6).
A Qualified Person, by possession of a recognized degree or
certificate of professional training, or by extensive knowledge,
training and experience, has successfully demonstrated the
ability to solve problems relating to the installation of the
EZ-SCREEN System and its integration with the guarded
machine. In addition to everything for which the Designated
Person is empowered, the Qualified Person is empowered to:
• Install the EZ-SCREEN system,
• Perform all EZ-SCREEN checkout procedures (see Section
6),
• Have access and make changes to the internal light grid
configuration settings and hold possession of the Banner
spanner wrench that opens the configuration access port plug,
and
• Reset the system following a lockout condition.
Resetting the System
System resets are performed using an external Reset switch.
This switch must be located outside the guarded area, and not
within reach of anyone inside the guarded area (see Section
3.4). Its location should provide a clear view of the entire
safeguarded area. If any hazardous areas are not within view
from the switch location, additional means of safeguarding must
be provided.
The switch should be protected from accidental or unintended
actuation (e.g., through the use of rings or guards).
If supervisory control of the Reset switch is required, a key
switch may be used, with the key kept in the possession of a
Designated or Qualified Person. Using a key switch will also
provide some level of personal control, since the key may be
removed from the switch. This will hinder a reset while the key
is under the control of an individual, but must not be relied upon
solely to guard against accidental or unauthorized reset . Spare
keys in the possession of others or additional personnel entering
the safeguarded area unnoticed may create a hazardous
situation .
Reset Routine
The EZ-SCREEN requires a manual reset to clear a latch
condition and resume operation following a stop command. To
perform a manual reset, close the normally open Reset switch
for a least 1/4 second, but not longer than 2 seconds, and then
re-open the switch. Internal lockout conditions also require a
manual reset to return the system to RUN mode after the failure
has been corrected and the input correctly cycled .
3.3 Mechanical Installation Considerations
Three factors have the greatest influence on the mechanical
installation of the
EZ-SCREEN System:
• The required beam configuration
• The required separation (safety) distance
• The presence of supplemental safeguarding
3.3.1 Beam Configuration
When using one or more EZ-SCREEN Point Systems to form a
grid for access-guarding and perimeter-guarding applications,
careful consideration must be given to the beam configuration,
in order to ensure proper operation. EZ-SCREEN Point Systems
must be installed so that they do not interfere with each
other and are not affected by adjacent photoelectric systems .
Configuration issues include:
• The required number of beams
• Beam height from floor
• Mounting methods for multiple systems
• Sensing mode configurations
Number of Beams and Beam Height from Floor
Recommended beam configurations for access-guarding and
perimeter-guarding applications are described in standards such
as ANSI/RIA R15.06 and EN 999 (see Figure 3-13).
Mounting Methods for Multiple Systems
To prevent light from the emitter of one System from affecting the
receiver of another System, the beams from the Systems must
be isolated from one another through the use of physical non-
reflective barriers (see Figure 3-11). Mounting the emitters and
receivers so that the beams travel in the opposite directions, as
shown in Figure 3-3, also helps to isolate systems.