Rockwell Automation 42BT Background Suppression Sensor - Manual (Page 2)

2
Background Suppression
Installation Considerations
Target
Note: Due to the detection method, targets traveling
horizontally to the sensor’s optics are detected. Targets
traveling vertically may not be accurately detected. For
reliable background suppression, a minimum
separation distance of 6 mm is recommended between
the target and the background.
Mounting the Sensor
Securely mount the sensor on a firm, stable surface or
support. An application which is subject to excessive vibration
or shifting may cause intermittent operation. For installation
convenience, we offer a wide range of mounting brackets.
See the Accessories section for more details.
Sensor Adjustment
Once securely installed, the sensing range of the sensor must
be set using the five-turn adjustment knob on the top of the
sensor. This knob is used to set the suppression point (point
at which the background will be suppressed) of the sensor.
Adjustment with Background Present
1. Using an instrument screwdriver, adjust the suppression
point to its minimum setting by turning the knob
counterclockwise until a “click” can be heard.
2. The background suppression cutoff point for the 42BT
sensor may be set between 200 mm and a maximum of
2 m (depending on the model)
3. If a background is present up to the maximum rated
distance (1 m for 42BT--B2LBSL--F4 and 2 m for
42BT--B1LBSN--F4), the suppression point should be set
just before this background to allow detection of targets up
to that point. Do this by rotating the knob clockwise until
both indicators (stability and output) turn ON
— . Then rotate
the knob counterclockwise until both LEDs turn OFF ˜ .
4. The sensor is now configured to detect targets between
the sensor face and the suppression point. Note that the
reflectivity of the target and the background will influence
the detection capability of the sensor. Use the included
response curves to help characterize the sensor’s
performance.
— Selector switch in light operate (L.O.) mode. For dark operate (D.O.) mode, the stability LED
turns ON and output LED turns OFF.
˜ Selector switch in light operate (L.O.) mode. For dark operate (D.O.) mode, the stability LED
turns OFF and output LED turns ON.
Adjustment with no Background Present
1. Using an instrument screwdriver, adjust the suppression
point to its minimum setting by turning the knob
counterclockwise until a “click” can be heard.
2. The background suppression cutoff point for the 42BT
sensor may be set between 200 mm and a maximum of
2 m (depending on the model)
3. If no background is present up to the maximum rated
distance (1 m for 42BT--B2LBSL--F4 and 2 m for
42BT--B1LBSN--F4), the suppression point should be set
just after the target to be sensed. Do this by rotating the
knob clockwise with the target present until both indicators
(stability and output) turn ON
— . Then rotate the knob
counterclockwise until both LEDs turn OFF ˜ . When using
this method, ensure that the stability indicator (Green LED)
is ON.
4. The sensor is now configured to detect targets between
the sensor face and the suppression point. Note that the
reflectivity of the target and the background will influence
the detection capability of the sensor. Use the included
response curves to help characterize the
ٛ
sensor s
performance.
—
Selector switch in light operate (L.O.) mode. For dark operate (D.O.) mode, the stability LED
turns ON and output LED turns OFF.
˜
Selector switch in light operate (L.O.) mode. For dark operate (D.O.) mode, the stability LED
turns OFF and output LED turns ON.
Wiring Diagrams
Quick disconnect connection is shown in the following
diagrams. Pin numbers correspond to male connectors on the
sensor.
Micro (M12) Male QD on Pigtail
4
3
1
2
Pico (M8) Male QD on Pigtail
4
3 1
2
NPN and PNP Outputs
Black
+
--
+
--
1
2
4
3
Quick-Disconnect
Brown
White
Blue
Approximate Dimensions [mm (in.)]
20
(0.78)
70
(2.75)
2--4.2 (0.17)
Dia.
57.5
(2.26)
40
(1.57)
15 (0.59)
Axis
5.5 (0.21)
20.5 (0.80)
2 m cable
4.2 (0.17) Dia.