Banner OMNI-BEAM Series - Manual (Page 2)

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D.A.T.A. ™
Sensor Self-diagnostic System
(US patent #4965548)
D.A.T.A. System Description
Banner's exclusive D.A.T.A. (Display and Trouble Alert) system warns of marginal sensing
conditions usually before a sensing failure occurs. This self-checking diagnostic system warns of
a problem by flashing one or more lights in a multiple-LED array, and by sending a warning signal
to the system logic controller (or directly to an audible or visual alarm) by way of the OMNI-
BEAM's dedicated alarm output.
The D.A.T.A. lights are located on the top of the sensor head and are viewed through a transparent
LEXAN
® cover. The D.A.T.A. lights are configured as follows:
Moisture Alert: Severe moisture inside the sensor head, caused
by condensation or by entry of moisture when the access cover is removed,
will cause the #1 light to flash.
High Temperature Alert: When the temperature inside the sensor
head exceeds 70
°
C (+158
°
F), the #2 light will flash.
Low Voltage or Overload Alert: The number #3 light will flash
whenever the sensor supply voltage drops below the minimum that is specified for the power block in use (see power block specifications,
page 5). Power block outputs are also shut down to prevent damage to the load(s) from low voltage.
When using dc power block models OPBT2, OPBT2QD, or OPBT2QDH, the #3 light will flash if either the load output or the alarm output becomes
shorted. Both outputs will be inhibited, and the circuit will "retry" the outputs every 1/10 second. The outputs will automatically reset and function
normally when the short is corrected.
High Gain Warning: The #9 light will flash if the "dark" signal never goes below #4 on the display, and instruct the operator to decrease
the gain (see photo above). There are two possible conditions:
1) The High Gain Warning alarm will come "on" if the "dark" signal slowly increases to the #4 level and remains at that level for a
predetermined delay time. This condition is commonly caused by an increase (over time) of unwanted background reflections when using reflective
sensing modes, such as diffuse (proximity) and convergent beam. 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 High Gain Warning alarm will latch "on" if the "dark" signal does not fall below the #4 level during a sensing event. The alarm is
automatically reset on any subsequent sensing event in which the "dark" sensing level falls below the #4 level. This is accomplished by reducing the
GAIN control setting and/or by removing the cause of the unwanted light return in the "dark" condition.
Low Gain Warning: The #10 light will flash if the "light" signal never goes above #5 on the display, and instruct the operator to increase
the gain (see photo, above). There are two possible conditions:
1) The Low Gain Warning alarm will come "on" if the light signal slowly decreases to the #5 level and remains at that level for a predetermined
delay time. This situation most commonly occurs in opposed or retroreflective sensing systems, and is caused by a decrease in light in the unblocked
condition (over time) due to obscured lenses or gradual sensor misalignment. The alarm will reset as soon as the light signal strength exceeds the #5
level.
2) The Low Gain Warning alarm will latch "on" if the light signal does not exceed the #5 level during a sensing event. The alarm is
automatically reset by any subsequent sensing event in which the "light" signal exceeds the #5 level. This is accomplished by increasing the GAIN
control setting and/or by lens cleaning and sensor realignment.
Low Contrast Warning: The #9 and #10 D.A.T.A. lights will flash simultaneously to indicate that there is not enough optical contrast
for reliable sensing. This occurs when the "light" condition is at the #5 level and the "dark" condition is at the #4 level for a sensing event.
If this warning occurs, the application should be fully re-evaluated to find ways to increase the differential between the "light" and "dark"
conditions. The Low Contrast alarm is automatically reset by any subsequent sensing event in which the "light" signal exceeds the #5
level and the "dark" signal falls below the #4 level.
The SENSE LED indicates when a target has been sensed. When the sensor head is programmed for LIGHT operate, it lights when
the sensor receives enough light to exceed the #5 threshold. When programmed for DARK operate, it lights when the received signal
falls below the #5 threshold. The SENSE LED is located at the far left end of the D.A.T.A. array.
The LOAD indicator LED lights whenever the load is energized (after the timing function, if any). The LOAD LED is located at
the far right end of the D.A.T.A. array.
The SENSE and LOAD indicator LED locations are visible in the photograph above.
SENSE
SENSE and LOAD Indicator LEDs
LOAD
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