Banner A-GAGE MINI-ARRAY Series - Manual (Page 6)

6
P/N 117167 rev. A
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
MINI-ARRAY ®
Two-Piece Measuring Light Screen
1.4.1 Marginal Alignment/Dirty Lens Detection (Output #2)
When the received light signal drops below a predetermined threshold, the receiver
will recognize a “marginal alignment” or “dirty lens” condition. (The dirty lens
threshold is equivalent to three times the minimum light signal necessary for
detection.)
Once this condition is detected, the receiver will signal the user that the lens
surface should be cleaned or re-aligned. The Yellow diagnostic LED will turn ON
until the condition is no longer detected (whether the light screen is blocked or
clear). This advance recognition can be used to initiate a proper maintenance
process.
1.4.2 Fault Detection and Sensor Degradation Operation (Output #2)
The receiver detects an occluded light channel detected when one or two
consecutive light channels remain blocked after eight or more vehicles are
detected. Once a blocked channel is detected (the Yellow diagnostic LED will
flash at 2 hertz), the receiver will note the fault and begin to operate in sensor
degradation mode.
Once the receiver detects a permanently blocked optical channel, it will effectively
ignore the degraded optical channel while continuing to operate. This allows the
sensor to continue working and for many instances, provide reliable service.
Along with ignoring permanently blocked channels, the sensor continuously
monitors sensor performance. Should an optical channel become inoperable (due
to a faulty light channel), the sensor will detect the problem and begin to operate
in the sensor degradation mode. Sensor degradation mode provides the user with
advance notice of a fault while continuing to maintain a functional traffic lane.
Emitter faults: In addition to sensing a permanently blocked channel and a faulty
light channel, the receiver can detect a non-functioning emitter (possibly caused by
a disconnected cable). The receiver’s Green and Red diagnostic LEDs will flash at 2
hertz to signal this emitter condition.
System Overview