Shadow 8 User Manual
1139300
Introduction
1-11
Interlock state until the operator turns the key switch to the START position, and Shadow 8
switches to Curtains Unobstructed.
Start/Restart Interlock operating mode is particularly useful in perimeter guarding
applications when there is a walk-in hazard inside the guarded area.
Additional details about operating mode and instructions for making operating mode settings
are provided starting on page 3-3.
Programmable Fixed Blanking
Shadow 8 allows you to program an area within the sensing field into which a stationary
fixture may protrude without triggering a Curtains Obstructed state and stopping the guarded
machine. This programmed area, which is created by disabling the beams that normally
protect it, is called a fixed blanking window.
Fixed blanking windows may span any number of beams as long as 7 to 9 consecutive beams
on Main heads remain unblanked, depending on Shadow 8 model, and 2 consecutive beams
remain unblanked on Extensions. (A minimum number of consecutive clear beams is
necessary to allow Shadow 8 receiver(s) and transmitter(s) to synchronize their sequencing–
see Shadow 8 Operation, page 1-6.)
Multiple fixed blanking windows can be programmed for a standalone pair of light curtains or
for up to four pairs of optic heads as long as the consecutive number of clear beams rule is
satisfied.
A detailed discussion of fixed blanking and instructions for programming a fixed blanking
window are provided starting on page 3-4.
If the obstruction being blanked is not large enough to extend all the way from transmitter to
receiver, Shadow 8’s minimum object sensitivity increases, and the safety distance must be
increased accordingly. In this case, you should not program more than one beam as a fixed
blanking window (see Calculating the Safety Distance, page 2-2).
Floating Blanking
Shadow 8’s floating blanking feature allows you to disable one beam at any location along the
length of the light curtain, letting any object 1 in. or smaller penetrate the sensing field in a
random pattern without causing the light curtain to enter a Curtains Obstructed state. The
single blanked beam may be used in any segment in a multi-segment installation.
DO NOT CREATE A FIXED BLANKING WINDOW GREATER THAN ONE BEAM UNLESS THE
ENTIRE AREA BETWEEN TRANSMITTER AND RECEIVER IS OBSTRUCTED
Do not blank more than one beam unless the entire area between transmitter and receiver is
blocked by a permanent fixture or is guarded.
Failure to comply with these instructions will result in death or serious injury.
DANGER
!
Содержание Shadow 8
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