Shadow VI User Manual
1107200
Installation and Checkout
Chapter 2
page 19
Shadow light curtains must be mounted away from the pinch point (or hazardous area) of the
press at a specific distance. This distance is based on the stopping time of your press. This
distance is called the safety distance. It must be calculated using a precise formula. This
ensures that Shadow VI can send the stop signal to the press, and the press will stop, before
the operator's hand reaches the hazardous area.
This next illustration shows how you would measure the distance between the pinch point (or
hazardous area) of your press and the light curtain.
pinch point
transmitter
Distance between
light curtain and
pinch point
One of light curtain's
invisible light beams
receiver
Figure 2-1. Distance Between Pinch Point and Light Curtain
This distance must be greater than the calculated safety distance or Shadow may not be
able to stop the press before an operator's hand reaches the hazardous area.
OSHA and ANSI Requirements
All machine safeguarding devices, including Shadow VI, must be located at the correct
safety distance from the pinch point or hazardous area. OSHA regulations govern the
mounting of infrared light curtains when used with mechanical power presses
(OSHA 1910.217). The OSHA formula has been used as a guide in other applications since
there has not been a well-known formula for safety distance which governs general machine
guarding.
When calculating safety distance, Wintriss, on the other hand, recommends that you use the
formula from ANSI B11.1-2009. This formula represents a new consensus on the proper
installation of light curtains. ANSI B11.1 has been developed specifically for guarding of
mechanical power presses. However, it should be used as a guide in other applications as
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