Rockwell Automation 42MBS Series 5100 Background Suppression with Timing Installation Instructions - Manual (Page 3)

ALIGNMENT
1. Loosen lock to allow sensing range adjustment.
2. Adjust “Coarse” sensing range adjustment to the maximum posi-
tion (full counterclockwise position)
3. Set “Light Energized” (LT)/“Dark Energized” (DK) switch to the
Light Energized position.
4. Select short (0--1.5sec) or Long (0--15sec) “off delay” (one-shot)
switch.
5. Select short (0--1.5sec) or Long (0--15sec) “on delay” (one-shot)
switch.
6. Select “Time delay” (TD) or “One-Shot” (OS) operation switch.
7. Set the on time to minimum, with the on-timing pot. (full counter
clockwise)
8. Set the off-time to maximum, with the off-timing pot, when in
short-off mode (full clockwise) or to at least 2--3 seconds, when
in long-off mode.
9. Turn “coarse” sensing range adjustment to the minimum position
(full clockwise).
10. Position the control in its application and increase the sensing
range until the control senses the background. The Red LED in-
dicator will turn On. The Green LED (2X margin indicator) will
probably turn On.
11. With the “fine” adjustment, decrease the sensing range until the
Green LED turns Off.
12. Place the object to be detected in front of the control at the ex-
pected sensing distance. Both red and green LED’s should turn
On. Remove the target.
13. Time Delay Operation -- If after the off delay has elapsed the
Red LED indicator turns Off, the control has the correct adjust-
ments and settings should be locked with the lock screw. If
the Red LED does not turn Off, slightly reduce the sensing
range with the fine sensing range adjustment and repeat steps
12 and 13.
14. One-Shot Operation -- Replace the target in front of the control
after the one shot time has elapsed. If the Red LED turns On,
the settings are correct and can be locked with the lock screw.
If the Red LED does not turn On, slightly reduce the sensing
range with the fine sensing range adjustment and repeat steps
12 and 14.
15. Select Light or Dark operate mode with switch.
16. Adjust for the desired delays with the On and Off timing pots.
17. Tighten the lockscrew after adjusting the sensing range. A slight
increase in sensing distance may occur. Typically .25 (.63cm) at
12 (30.5cm), .12 (30.5cm) at a 6 (15.2cm) and .062 (1.57cm)
at 3 (7.62cm), for both background and target. If necessary,
sensing range variation can be compensated for by adjusting to
11.75 (29.8cm) for a 12 (30.5cm) suppression point, 5.875
(14.9cm) for a 6 (15.2cm) suppression point, and 2.95
(7.46cm) for a 3 (7.62cm) suppression point. Repeat steps 5 and
6 to verify the range after the lockscrew is tightened.
APPLICATION PRECAUTIONS
To obtain the high sensitivity and sharp cut-off required in a back-
ground suppression control, two photodetectors are used. One detec-
tor senses objects in close, the other detector will sense further out.
If the further out signal (background) is greater than or equal to
the close in signal, the control remains Off, if the close signal is great-
er than the background signal, the control output will turn On.
This interdependence of the two photodetectors and overlapping
sensing areas require that the object being sensed passes by the sensor
in certain directions or false operation could occur. Therefore, an ob-
ject always should travel on a x-axis perpendicular with the control.
See figures below.
FIELD OF VIEW
OVERLAP
SUPPRESSION
POINT
FAR SENSING
AREA
OBJECT
TO BE
SUPPRESSED
Direction
of travel Control
Top View
Suppression
Point
Both
sensing ranges
overlap
OBJECT
TO BE
SUPPRESSED
CLOSE SENSING
AREA
Direction
of travel
WRONG DIRECTION OF TRAVEL CORRECT DIRECTION OF TRAVEL