Rockwell Automation 445L GuardShield Safe 4 and Safe 4 PAC Safety Light Curtains User Manual - Manual (Page 12)

R
GuardShield™ Safe 4 Safety Light Curtain User Manual
10
Original instructions
Incorrect Installation
The GuardShield Safe 4 must be mounted at the proper distance
from the point of operation hazard. This distance is referred to as
the Safety Distance.
Figure 8: Determining machine stopping time and safety distance
After installation and alignment of the GuardShield Safe 4 safety
light curtain, the protection field has to be tested with the test rod
for the corresponding resolution (14 or 30 mm) according to
Figure 9.
Figure 9: Correct testing of the protective field using a test rod
Multiple GuardShield Safe 4
When two or more GuardShield Safe 4s are mounted in close
proximity to one another, it may be possible for the receiver of
one GuardShield Safe 4 pair to receive infrared light from the
transmitter of another GuardShield Safe 4 pair.
There are various techniques to prevent or eliminate the
possibility of optical interference from GuardShield Safe 4 light
curtains mounted in the same plane. The simplest method is to
alternate transmitter and receiver pairs so that the receiver from a
second pair is facing away from the transmitter of another
GuardShield Safe 4 pair in close proximity. It is also possible to
place a physical barrier between pairs to prevent the infrared light
from reaching another GuardShield Safe 4 pair.
Figure 10: Multiple GuardShield Safe 4 alignment options
Mounting Brackets
The GuardShield Safe 4 is mounted using brackets which attach to
the side of both transmitter and receiver. It may be necessary to
use additional brackets to mount the GuardShield Safe 4 at a
proper safety distance from the machinery hazard.
Operators can reach hazardous machine
parts without passing through the
protective field.
Operators can step between protective
field and hazardous machine parts.
Middle of Depth of Protective Field
Safety Distance
Point of Operation
Top of tool
Bottom of tool
To avoid the possibility of
standing between the protective
field and the point of operation,
the distance must be
maintained.
Protective Field Marking
Machine stop
time
Tr
ansmitter
Rec
eiv
er
Transmitters emit in
opposite direction. Each
receiver receives only the
beams of the appropriate
transmitter.
Transmitters emit in same
direction:
Optical (physical) barrier
necessary
Positioning of the light
curtain: Transmitters emit in
opposite direction.