Shadow VI User Manual 1107200
Installation and Checkout Chapter 2 page 25
Pass-through Protection
DANGER
!
OPERATOR CAN BE BETWEEN LIGHT CURTAIN AND HAZARDOUS AREA
Ensure that the operator cannot position him- or herself between the light curtain and the
hazardous area. Use another pair of light curtains or a mechanical barrier at knee-to-waist
height to prevent the operator or a passerby from being “trapped” between the light curtain
and the hazard.
Failure to comply with these instructions will result in death or serious injury.
Another important impact on safety distance is “pass-through protection”. To illustrate,
consider that you have determined your safety distance to be 12 inches from the hazardous
point of operation — “pinch point”. There is a danger that a person could become trapped
between the light curtain and the pinch point.
A recommendation would be to install a second set of light curtains at waist height mounted
horizontally between the vertical light curtain and the hazard. See the illustration below.
With Shadow VI, two sets of optic heads can be wired to the same control box.
Press
pinch point
horizontal set
vertical set
safety distance
Figure 2-2. Plan View Illustrating “Pass Through” Protection
The size of the horizontal light curtain should be the minimum length necessary to detect the
thinnest operator standing between the vertical light curtain and pinch point. For example, a
6" light curtain located in the center of a 12" safety distance at waist height may be
reasonable.
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