Banner EZ-SCREEN Low-Profile Safety Light Curtain Systems - Manual (Page 28)

26
P/N 133487
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
Overview
26
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
3.1.8 Installation of Multiple Systems
Whenever two or more EZ-SCREEN LP emitter and receiver
pairs are adjacent to one another, optical crosstalk may
potentially take place between systems. To minimize optical
crosstalk, alternate the positions of emitters and receivers, (see
Figure 3-9a), or alternate scan codes.
When three or more sensor pairs are installed in the same plane
(as shown for two pairs in Figure 3-9), optical crosstalk may
occur between sensor pairs whose emitter and receiver lenses
are oriented in the same direction. In this situation, eliminate
optical crosstalk by mounting these sensor pairs exactly in line
with each other within one plane, or by adding a mechanical
barrier between the pairs.
To further aid in avoiding crosstalk, the sensors feature two
selectable scan codes. A receiver set to one scan code will not
“see” an emitter set to another code (see Section 4.2).
Mirrors are not allowed for applications that would allow
personnel undetected access into the safeguarded area.
If mirrors are used, the difference between the angle of
incidence from the emitter to the mirror and from the mirror to
the receiver must be between 45° and 120° (see Figure 3-8).
If placed at a sharper angle, as shown in the example, an
object in the light screen may deflect beam(s) to the receiver,
preventing the object from being detected (i.e., “false proxing”).
Angles greater than 120° result in difficult alignment and
possible optical short circuits.
SSM and MSM Series Glass-Surface Mirrors –
Maximum Emitter and Receiver Separation
Sensor Models
Number of Corner Mirrors
1 2 3 4
14 mm or 25 mm
Resolution Models
7 m (23') Range
6.5 m
(21.2') 6.0 m
(19.5') 5.5 m
(18.0') 5.1 m
(16.6')
See the specific mirror data sheet or the Banner Safety Catalog for further information.
Figure 3-8. Never use EZ-SCREEN LP in a retroreflective mode.
Emitter
Recommended sensor
configuration angle:
45° < A < 120°
A
Mirror
Receiver
Emitter
Mirror
Receiver
3.1.7 Use of Corner Mirrors
EZ-SCREEN LP may be used with one or more corner mirrors
(see Section 2.4). The use of glass-surface corner mirrors
reduces the maximum specified emitter/receiver separation by
approximately 8 percent per mirror, as shown below:
WARNING . . .
Avoid Retroreflective
Installation
Do not install emitters and receivers in “retroreflective” mode,
with less than a 45° angle of incidence, as shown in Figure 3-8.
Sensing could be unreliable in this configuration; serious
bodily injury or death could result. WARNING . . .
Scan Code
In situations where multiple systems are mounted closely
together, or where a secondary emitter is in view (within ±5°),
within range of an adjacent receiver; the adjacent systems must be
configured for different Scan Codes (i.e., one system set for Scan
Code 1 and the other for Scan Code 2).
If not, a receiver may synchronize to the signal from the wrong
emitter, reducing the safety function of the light screen.
This situation will be discovered by performing the trip test
(see Section 3.4.3).
WARNING . . .
Multiple Pairs of Sensors
Do not connect multiple pairs of sensors to one Interface
Module (e.g., IM-T-9A/-11A) or otherwise parallel OSSD outputs.
Connection of multiple OSSD safety outputs to a single device
can result in serious bodily injury or death, and is prohibited.
A
Mirror
Receiver
Emitter
An object passing through
the beams may not be
detected
Emitter
Mirror
Receiver
Recommended
sensor
configuration angle:
45° < A < 120°