Wintriss Shadow VI, User Manual

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Shadow VI User Manual 1107200
Installation and Checkout Chapter 2 page 39
Using Weld Shields
The operation of Shadow VI is not affected by smoke, dirt, or oil found in a typical industrial
environment. In a more severe environment, you may need to install clear plastic shields that
provide protection from weld splatter and other hazards.
Weld shields are clear plastic covers that fit on the face of the transmitter and/or receiver.
They come in kits ready for installation and can be easily replaced if they become so
damaged or scratched that the light curtain no longer indicates “green” during normal
operation. (see the Troubleshooting Guide in Chapter 4 of this manual).
If you want to install a weld shield, you must order a separate kit (weld shield #42873xx,
where “xx” is the height of the optic head in inches) for each optic head. Detailed
instructions for installation are included in each kit, along with the necessary screw and
clip(s). Each optic head has a screw hole for mounting a shield.
Mounting Shadow Light Curtains Upside Down
There is nothing inherent in the design of Shadow VI heads that prevents them from being
mounted upside down. If you are mounting Shadow VI this way for any reason, both heads
must be inverted. Shadow heads can also be mounted at any angle as long as they are in the
same plane. Vertical mounting is the easiest.
Avoiding Cross Talk When Mounting 2 Sets of Shadows
Because the receiver only accepts infrared light pulses of a certain duration in proper
sequence, Shadow cannot be affected or fooled by other light sources. All other continuous
light sources and even pulsed light sources are "tuned out", and Shadow continues to work.
Also, changes in area lighting or even flashing strobe lights will not affect operation. Even if
the Shadow receiver were flooded with infrared light of the same intensity, the receiver
would not be fooled because it only accepts light
pulses of the right frequency in proper
sequence. Instead it would send a stop command to the press.
In some cases, however, using two sets of Shadows 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.
If your application requires that you mount a set of Shadows horizontally next to a vertical
set to detect an operator between the vertical set and the pinch point, you may need to
alternate these sets to avoid any incidence of cross talk between sets. To do this, you may
need to mount the horizontal transmitter next to the vertical receiver and vice versa.
Another scenario where cross talk may occur involves machines that are close together. Use
caution if the guarded machines are too close together, such that the light from one
transmitter may be detected by the other press's receiver.
To avoid any incidence of cross talking, you can select from several solutions. One is to
insert a barrier of some type, such as a blind, between the two sets of Shadow heads. Make
sure that the barrier runs all the way from the transmitter to the receiver. A second approach
is to reverse the position of the transmitter and receiver on the second press. Another option
is a combination of the above. The next illustration shows reversing the position of the optic
heads on the second press.