Banner Q60 Background Suppression Series - Manual (Page 4)

Q60V Series Adjustable-Field Sensors –
Visible Red Emitter
page 4
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
Color Sensitivity
The effects of object reflectivity on cutoff distance, though
small, may be important for some applications.
The excess gain curves on page 1 were generated using a white
test card of 90% reflectance. Objects with reflectivity of less
than 90% reflect less light back to the sensor, and thus require
proportionately more excess gain in order to be sensed with the
same reliability as more reflective objects. When sensing an
object of very low reflectivity, it may be especially important to
sense it at or near the distance of maximum excess gain.
It is expected that at any given cutoff setting, the actual cutoff
distance for lower reflectance targets will be slightly shorter
than for higher reflectance targets (see Figure 10). This
behavior is known as color sensitivity.
The percentage of deviation indicates a change in the cutoff
point for either 18% gray or 6% black targets, relative to the
cutoff point set for a 90% reflective white test card.
For example, the cutoff point decreases 4% for a 6%
reflectance black target when the cutoff point is adjusted for
1000 mm (40") using a 90% reflectance white test card. In
other words, the cutoff point for the black target is 960 mm
(38") for this setting.
Setting the Output Delay
The output of the Q60AFV sensor may be delayed between
0.008 and 16 seconds, in any of 72 increments. Delay is
indicated on the 5-segment light bar using single LED
segments or combinations of them, in varying stages of
intensity. Major increments, displayed by a single full-intensity
LED, are shown in Figure 13.
Figure 10. Q60V Cutoff point deviation
0
-1
-2
-3
-4
-5
200 300 400 500 600 700 800 900 1000
Cutoff Setting (90% White Card)
Percent Deviation
18% Gray Card
6% Black Card
Figure 11. Q60V minimum range vs. cutoff setting
150
140
130
120
110
100
90
80
70
60
50
200 400 600 800 1000
Cutoff Distance (mm) with 90% White Card
Minimum Range with a 6% Black Card (mm)
Figure 12. Q60V hysteresis
Figure 13. ON/OFF Delay options
2.0
1.5
1.0
0.5
0
200 400 600 800 1000
Cutoff Setting (mm) with 90% White Card
Hysteresis (% of Cutoff) with 6% Black Card
Step
#
Delay
Time
0
No
Delay
8
0.062
second
24
0.250
second
40
1.00
second
56
4.0
seconds
72
16
seconds
DO SIG LO
DO SIG LO
DO SIG LO
DO SIG LO
DO SIG LO
DO SIG LO
LED
Status