1139300 Shadow 8 User Manual
2-12 Installation and Checkout
Providing Pass-through Protection within the Safety Distance
“Pass-through protection” must be provided for areas within the calculated safety distance in
which operators may have to move. For safety distances of 6 in. or more, there is a danger
that the operator 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 Figure 2-2, below). The
length of the horizontal light curtain should be the minimum needed to detect the thinnest
operator standing between the vertical light curtain and pinch point. For example, a 9.4-in.
extension light curtain located in the center of a 12 in. safety distance at waist height should be
adequate.
With Shadow 8, two sets of optic heads can be wired to the same WPC press control or
optional Shadow 8 control box, making this configuration easily implemented.
All areas between the light curtains and pinch point that are not guarded by Shadow 8 must be
protected by supplemental guarding (see Figure 2-3, page 2-13).
PREVENT OPERATOR FROM BEING ABLE TO STAND BETWEEN LIGHT CURTAIN AND
HAZARDOUS AREA
Ensure that the operator cannot position himself 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.
Figure 2-2. Plan View of Pass-through Protection
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