Correct Installation; Installation And Mounting - Allen-Bradley GuardShield 440L-T2KA series Installation Instructions Manual

Distance D (meters)
Minimum distance from reflecting surfaces
How to Determine the Minimum Distance from the Reflecting Surfaces:
→ Determine the distance D [m] sender-receiver
→ Read the minimum distance a [mm] from the graph:
a (mm)
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
3 5
Graph, minimum distance from reflective surfaces
The effective aperture angle for the GuardShield™ Type 2 system is
within ±5.0° at a mounting distance of > 3.0 m (9.8 ft). Calculate the
minimum distance to reflective surfaces depending on the distance
between the transmitter and the receiver. Use an aperture angle of
±5.0°, or take the appropriate value from the following table:
Distance Between Transmitter and Receiver
Range D [m (ft)]
0.2...3.0 (0.65...9.8)
4.0 (13.1)
5.0 (16.4)
6.0 (19.6)
7.0 (22.9)
10.0 (32.8)
16.0 (52.4)
Note: Formula: a = tan 5° x D [mm] = 0.0875 x D [mm]
a = minimum distance to reflecting surfaces
D = distance between transmitter and receiver

Installation and Mounting

This section describes the preparation, selection, and installation of the
GuardShield™ Type 2 safety light curtain.
a
D (m)
10 15 20
Minimum Distance
a [mm (in.)]
263 (10.4)
350 (13.8)
437 (17.2)
525 (20.7)
613 (24.1)
875 (34.5)
1400 (55.1)
Rockwell Automation Publication 440L-IN011B-EN-P - October 2017
The standard GuardShield™ Type 2 has an amber status indicator in the
receiver, which is used as an alignment aid. The status indicator begins
to flash when the infrared light from the transmitter is "seen" by the
receiver. This status indicator turns off when optimal alignment is
attained.
Alignment Procedure: Standard GuardShield™ Type 2
Mount and connect both transmitter and receiver. They must be
parallel to each other and be positioned at the same height.
Turn on power to GuardShield™ Type 2 system.
Rotate the transmitter while watching the amber indicator on the
receiver to find the point where the indicator for the ON state (green
indicator) illuminates and the amber indicator goes off.
Determine the maximum left and right turning angles and position
unit in center. Tighten all hardware assuring that the alignment
indicator is not illuminated.
Cycle power to assure that the system powers up and goes to the ON
state (alignment indicator is OFF).
An external laser (440L-ALAT) and mounting bracket
(440L­AF6109) is offered as an accessory for aligning the
GuardShield™ Type 2.
The GuardShield™ Type 2 safety light curtain is suitable for most
operating environments (IP65 environmental rating). Proper safety
distance and adequate protective height must be observed.
IMPORTANT The installation of the GuardShield™ Type 2 safety light curtain
must be such that access to the hazard is only possible through
the sensing field of the GuardShield™ Type 2. Auxiliary safe
guarding is required with the GuardShield™ Type 2 to meet this
requirement.
Determine if the machinery, on which the GuardShield™ Type 2 is
mounted, meets the requirements as specified in the beginning of this
manual. That is, machinery must be able to be stopped anywhere in its
stroke or cycle, consistently and repeatedly.

Correct Installation

Operators cannot reach hazardous
machine parts without passing through
the protective field.
Operators must not step between
protective field and hazardous machine
parts (by-pass prevention).
GuardShield Type 2 Safety Light Curtain
7