Banner EZ-SCREEN Low-Profile Safety Light Curtain Systems - Manual (Page 3)

P/N 133487
1
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
Overview
P/N 140044 rev. E 1
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
EZ-SCREEN LP
Instruction Manual Overview
Electrical connections (power, ground, inputs and outputs)
are made via M12 (Euro-style) quick-disconnects or unique
RD (removable disconnect) cordsets, depending on model. A
“System” as referred to in this manual may be defined as an
emitter and its receiver, plus their cabling, or to a cascade of
emitters and their receivers and their cabling.
Functions such as Trip/Latch select, Display Invert, Cascading,
Fixed Blanking (including Remote Teach), Reduced Resolution
(Floating Blanking), Scan Code select, and External Device
Monitoring are described in Section 1.4. An auxiliary (aux.)
output may be used to signal the state of the OSSDs to a
process controller; see Section 1.4.3. All models require
a supply voltage of +24V dc ±15%. See Section 2.4 for
interfacing solutions.
Both emitter and receiver feature 7-segment Diagnostic
Displays and individual LEDs to provide continuous indication
of operating status, configuration and error conditions. See
Section 1.4.7 for more information.
This manual contains numerous WARNING and CAUTION
statements. Warnings refer to situations that could lead to
significant or serious personal injury or death. Cautions refer to
situations that could lead to slight personal injury or potential
damage to equipment.
1. Overview
Figure 1-1. Banner EZ-SCREEN LP: a typical application
1.1 Introduction
Banner EZ-SCREEN LP emitters and receivers provide
a redundant, microprocessor-controlled, opposed-mode
optoelectronic “curtain of light,” or “safety light screen.”
EZ-SCREEN LP typically is used for point-of-operation
safeguarding, and is suited to safeguard a variety of machinery.
Emitters have a row of synchronized modulated infrared
(invisible) light-emitting diodes (LEDs) in a compact metal
housing. Receivers have a corresponding row of synchronized
photodetectors. The light screen created by the emitter and
receiver is called the “defined area”; its width
and height are determined by the length of the
sensor pair and the distance between them. The
low-profile housing provides maximum sensing
within minimum space; its defined area (sensing
area) is equivalent to the height of the housing.
The maximum sensing range is
7 m (23'), which
decreases if corner mirrors are used. The sensing
area extends from end to end of the housing; there
is no “dead zone.” Specialty brackets allow easy
mounting of cascaded sensors, without any loss of
resolution between sensor pairs.
In typical operation, if any part of an operator’s body (or any
opaque object) of more than a pre-determined cross section
is detected, the solid-state output signal switching device
(OSSD) safety outputs will turn OFF. These safety outputs are
connected to the guarded machine’s final switching devices
(FSDs) that control the primary control elements (MPCEs), which
immediately stop the motion of the guarded machine.
EZ-SCREEN LP is extensively FMEA (Failure Mode and Effects
Analysis) tested to establish an extremely high degree of
confidence that when properly installed, no system component
will (even if it should fail) cause a failure to danger.
The OSSD safety outputs are capable of performing a
“handshake” communication with the muteable safety stop
interface (MSSI) or universal safety stop interface (USSI) found
on other Banner Engineering safety products.
Banner EZ-SCREEN LP is a two-piece (“two-box”) system –
comprising an emitter and a receiver, but no external controller.
The external device monitoring (EDM) function ensures the
fault detection capability required by U.S. Control Reliability and
ISO13849-1 Categories 3 and 4 without a third box, a controller
or a “smart” (i.e., self-checking) safety module required of
systems without EDM.