5-4 Activating and Programming Exact Channel Select
5 Detection Options
10
5-3-1 The Effect of Exact Channel Select and Floating Blanking on Minimum Object
Resolution
When Exact Channel Select and/or Floating Blanking is active, the safety distance is affected. Exact Channel
Select and Floating Blanking desensitize the light curtain and increase the size of the minimum object detected.
The increase is equal to the channel spacing distance for each channel that is disabled.
• A F3SL system with one channel disabled has a minimum object sensitivity of:
30mm + 22mm =52mm (2.05 inches).
• A F3SL system with two channel disabled has a minimum object sensitivity of:
30mm + 22mm + 22mm =74mm (2.91 inches).
If the size of the object detected by the F3SL system increases, the minimum safe distance must increase. Use
the minimum object sensitivity given in to determine the new figure to use when computing the safety distance.
5-4 Activating and Programming Exact Channel Select
Exact Channel Select is activated by setting position 4 of Switches A and B, located inside the receivere end
cap. Refer Figure 3-1 and Table 5-5. Any mismatch between the settings of Switches A and B will result in a
alarm condition. To access Switches A and B, remove the four captive screws which secure the largest receiver
end cap. Set these switches before mounting the receiver.
To program an ECS pattern, the F3SL system must be in the machine stop state. An ECS pattern is stored by
blocking the appropriate area of the detection zone and pressing, then releasing the program button (See Figure
3-1 for location).
The F3SL system will then enter the interlock or machine stop condition, regardless of the operating mode. The
Start button may be pressed-and-released or power may be cycled to enter the machine run state. Subsequent
power cycles will result in operation in accordance with the configured operating mode.
A new ECS pattern is recorded when the system is in the machine stop state with no alarms, the configuration
switches are correctly set, and the Program button is pressed and released. If the configuration switches are
subsequently set to disable ECS, the stored ECS pattern is cleared.
Note:
The Program button is accessed by removing a tamper-resistant screw. A wrench which matches this
screw is provided in the receiver hardware package. This wrench should be kept under supervisor con-
trol. The tamper-resistant screw must be replaced to maintain the environmental integrity of the F3SL
system.
Table 5-4 Sample and D
pf
Factors
Total Number of Beams
Disabled by Exact Channel
Select and/or Floating Blanking
Minimum Object Resolution d
Depth Penetration Factor, Dpf
for use with ANSI Formula (Dpf
= 3.4 (d-7.0) mm)
None
30 mm (1.18 inches)
78.2mm (3.08 inches)
1 Beam
52 mm (2.05 inches)
153.0 mm (6.02 inches)
2 Beams
74 mm (2.91 inches)
227.8 mm (8.97 inches)
3 Beams
96 mm (3.78 inches)
302.6 mm (11.91 inches)
4 Beams
118 mm (4.65 inches)
377.4 mm (14.86 inches)
5 Beams
140 mm (5.51 inches)
452.2 mm (17.80 inches)
etc...
WARNING
Disconnect power before removing end cap.
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