1107200
Shadow VI User Manual
page 92
Chapter 4
Troubleshooting Shadow VI
8. Set switches S1, S2, and S4 and jumpers J12, J14, and J15 on the new Shadow VI
Control board in the positions they were in on the old board. (Instructions for setting
switches and jumpers are provided on page 51 (S2) and pages 57-61.)
9. Perform the steps in the
Checking and Correcting Cross Talk
In some cases, using two sets of Shadow optic heads in close proximity of each other may
cause "cross talk". Cross talk occurs when the LEDs from the first set's transmitter are
detected by the phototransistors from the second set's receiver. Cross talk could be the
problem if the green and red lights on the receivers from set #1 and set #2 flicker back and
forth even though there is no visible obstruction causing the light curtains to repeatedly
change state.
Diagnose the problem by performing this test. First, try to swap the transmitter with the
receiver on one of the sets. If the symptoms go away, cross talk was the problem. You can
also place an opaque barrier of some type (such as a wall or barrier) between the two sets.
Make sure that the barrier runs all the way from the transmitter to the receiver. If the
symptoms go away, cross talk was the problem.
Refer to the section "Avoiding cross talk when mounting 2 sets of Shadows" in Chapter 2
which provides alternate ways of mounting 2 sets of light curtains so that you can eliminate
the incidence of cross talk.
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