Banner EZ-SCREEN Low-Profile Safety Light Curtain Systems - Manual (Page 26)

24
P/N 133487
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
Overview
24
P/N 140044 rev. E
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
EZ-SCREEN LP
Instruction Manual
Installation and Alignment
Figure 3-4. Examples of incorrect emitter / receiver orientation
Figure 3-3. An example of supplemental safeguarding
3.1.5 Emitter and Receiver Orientation
The emitter and receiver must be mounted parallel to each other
and aligned in a common plane, with both cable ends pointing
in the same direction. Never mount the emitter with its cable
end oriented opposite the cable end of the receiver. If this
occurs, voids in the light screen may allow objects or
personnel to pass through the defined area undetected (see
Figure 3-4).
The emitter and receiver may be oriented in a vertical or
horizontal plane, or at any angle between horizontal and vertical,
as long as they are parallel and their cable ends point in the
same direction. Verify that the light screen completely covers all
access to the hazard point that is not already protected by hard
guarding or other supplemental guarding.
Figure 3-3 shows an example of supplemental safeguarding
inside a robotic work cell. The EZ-SCREEN LP, 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 (e.g., the safety mat
as an area guard between the robot, the turntable, and the
conveyor).
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 . . .
Proper Orientation of
EZ-SCREEN LP Emitters and Receivers
EZ-SCREEN LP emitters and receivers must be installed with
their corresponding cabled ends pointing in the same direction
(e.g., both cabled ends “up”). Failure to orient them properly will
impair the performance of the EZ-SCREEN LP and will result in
incomplete guarding, and could result in serious bodily injury
or death.
WARNING . . .
The Hazard Must Be
Accessible Only through the Defined Area
The installation of the EZ-SCREEN LP must prevent any
individual from reaching around, under, over or through the
defined area and into the hazard without being detected.
Mechanical barriers (e.g., hard guarding) or supplemental
safeguarding may be required to comply with this requirement, and
is described by ANSI B11 safety requirements or other appropriate
standards.
Figure 3-5. Examples of correct emitter / receiver orientation
a. Both cable ends down b. Both cable ends up
c. Oriented parallel to floor
with both cable ends pointing in
the same direction
a. Cable ends point in
opposite directions
Problem: Voids in defined area
b. Emitter and receiver not parallel to
each other
Problem: Reduced excess gain
Turn-
table
Area
Guarding
Robot
Hard Guarding
EZ-SCREEN LP
Reset Switch
Ds
Hard
Guarding
Conveyor
Opening
EZ-SCREEN LP
Area
Guarding