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GuardShield™ Safe 4 Safety Light Curtain User Manual
Incorrect Installation
Operators can reach hazardous machine
parts without passing through the
protective field.
Operators can step between protective
field and hazardous machine parts.
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.
Middle of Depth of Protective Field
Safety Distance
Protective Field Marking
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
10
Point of Operation
Top of tool
Machine stop
time
Bottom of tool
To avoid the possibility of
standing between the protective
field and the point of operation,
the distance must be
maintained.
Original instructions
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.
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.
R
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