a) Slightly loosen the sensor mounting screws.
b) Rotate one sensor left and right, noting the positions in each arc where the Status indicators turn red (Blocked
condition) or a zone indicator turns yellow (weak beam strength); repeat with the other sensor.
c) Center each sensor between those two positions.
d) Tighten the mounting screws, making sure to maintain the positioning as the screws are tightened.
page 42 for further information.
Flashing
6.4.4 Optical Alignment Procedure with Mirrors
S4B sensors may be used with one or more corner mirrors for guarding more than one side of an area. The MSM-... and
SSM-... rear-surface glass mirrors are rated at 85% efficiency. Thus, excess gain and sensing range are reduced when using
mirrors; see Use of Corner Mirrors, under
Mechanical Installation Considerations
on page 15.
During any adjustments, allow only one individual to adjust any one item at any one time.
In addition to the standard optical alignment procedure, verify:
1. The emitter, receiver, and all mirrors are level and plumb.
2. The middle of the defined area and the center point of the mirrors are approximately the same distance from a
common reference point, such as the same height above a level floor.
3. There are equal amounts of mirror surface above and below the defined area such that the optical beams are not
passing below or above the mirror.
Figure 16. Corner Mirror Alignment
Component 2 (Mirror)
Component 3 (Mirror)
Component 4
(Receiver)
Component 1
(Emitter)
6.4.5 Conduct a Trip Test
After optimizing the optical alignment and configuring fixed blanking and/or reduced resolution (if applicable), perform a trip
test to verify the detection capability of the S4B System.
This test also verifies correct sensor orientation, identifies optical short circuits, and verifies the expected resolution for
applications using reduced resolution. After the installation has passed the trip test, the safety outputs may be connected and
the commissioning checkout may be performed (initial installations only).
S4B Safety Light Curtain
32
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