Manual

OMNI-BEAM Sensor Heads
page
5
Figure 6. OMNI-BEAM D.A.T.A. LEDs
Using the D.A.T.A. Sensor Self-Diagnostic Feature
Banner’s exclusive D.A.T.A. feature warns of marginal sensing conditions, usually
before a sensing failure occurs, by flashing one or more lights in its multiple-LED
array, and by sending a warning signal to the system logic controller (or directly to an
audible or visual alarm). The chart below describes the meanings of the possible
signals.
Flashing LED Problem Description
#1 Moisture Alert
Severe moisture is inside the sensor head, caused by condensation or by entry of moisture when the
access cover is removed.
#2
High Temperature
Alert
The temperature inside the sensor head exceeds +70°C (+158°F).
#3
Low Voltage
or
Overload Alert
Sensor supply voltage is below the minimum specified for the power block in use. Power block outputs
also shut down to prevent damage to the load(s) from low voltage.
DC power blocks OPBT2, OPBT2QD, or OPBT2QDH: Either the load output or the alarm output is
shorted. Both outputs will be inhibited, and the circuit will “retry” the outputs every 1/10 second. The
outputs automatically reset and function normally when the short is corrected.
#9
High Gain
Warning
The “dark” signal never goes below #4 on the display; decrease the Gain setting. There are two possible
causes:
1) The “dark” signal slowly increases and remains at the #4 level for a predetermined delay time,
commonly caused by a gradual increase of unwanted background reflections in reflective sensing
modes (such as diffuse or convergent). The alarm will reset as soon as the cause of the unwanted
light signal is removed, or if the Gain control setting is reduced to bring the “dark” condition below
the #4 level.
2) The “dark” signal does not fall below the #4 level during a sensing event. The alarm automatically
resets when the “dark” sensing level falls below the #4 level (accomplished by reducing the Gain
control setting and/or by removing the cause of unwanted light return in the “dark” condition).
#10
Low Gain Warning
The “light” signal never goes above #5 on the display; increase the Gain setting. There are two possible
causes:
1) The “light” signal slowly decreases to the #5 level and remains at that level for a predetermined
delay. This most commonly occurs in opposed or retroreflective sensing systems, caused by a
gradual decrease in light in the unblocked condition, due to obscured lenses or sensor
misalignment. The alarm will reset when the light signal strength exceeds the #5 level.
2) The “light” signal does not exceed the #5 level during a sensing event. The alarm automatically
resets when the “light” signal exceeds the #5 level (accomplished by increasing the GAIN control
setting and/or cleaning the lens and realigning the sensor).
#9 and #10
Low Contrast
Warning
The lights flash simultaneously to indicate inadequate optical contrast for reliable sensing (the “light”
condition is at the #5 level and the “dark” condition is at the #4 level). If this occurs, re-evaluate the
application to find ways to increase the differential between the “light” and “dark” conditions. The alarm
automatically resets when the “light” signal exceeds the #5 level and the “dark” signal falls below the #4
level.