Daktronics AB-1600-1.5,2.5 - Manual (Page 49)

Maintenance & Troubleshooting
4-13
4.9 Display Ventilation Summary
Excessive heat shortens the life of all electrical components,
including lamps. Daktronics 1600 series large matrix displays
depend on a three-part ventilation system to prevent heat
buildup within the cabinet.
The three critical parts of the ventilation system are the filters,
fans and lenses. The fans draw cooler air from outside the
display through the filters and into the display. This incoming
air forces warm air already in the cabinet to exit through the
lenses on the face of the display, as illustrated in Figure 48.
Each lens has an exhaust port near the top to allow for
airflow. Before the air exits through the lenses, it passes past
the lamps, cooling them in the process. This maximizes the
life of the lamps. Figure 49 illustrates this lens airflow
process.
In addition, the display controllers in 1600 series
large matrix displays will turn off power to the
fans if they sense the display has been blank for
30 minutes. This action completes through the
relay in the fan control enclosure. This extends
the life of both the fans and the filters. The
display controller will start the fans
automatically when the display is in use.
4.10 Fan Filters
Shrouds on the rear of the display house the fan filters and shed rain. Check filters every 1500 hours
of operation for accumulation of debris that could restrict airflow.
Check filters after the display has been in operation for 1500 hours—and every 1500 hours after
that—to ensure that the display cools properly. Check filters more often if the display is located in a
dusty or harsh weather environment (i.e. along a gravel road with dust-laden air).
1500 hours is equivalent to 83 days if the display is operated for 18 hours a day and the power to the
display is turned off when not in use to ensure that the fans are not operating when the display is not
running. 1500 hours is equivalent to 62 days if the display is on running non-stop, 24 hours a day.
Clean the filter with a portable canister-type vacuum cleaner by gently vacuuming or by blowing
compressed air through the filter media. When using compressed air to clean the filter, direct the air
through the filter in the same direction that it flows during normal operation. The arrow stamped on
the outside of the filter frame indicates the direction of the airflow during normal operation. Hold the
air nozzle at least six inches from the filter to avoid damaging the filter material.
Fan
Filter
Cool Air
Intake
Warm
Air
Exhaust
CABINET
AIRFLOW
Figure 48: Cabinet Airflow
Lamp
Exhaust
Port
Reflector
Shell
Lens
LENS
AIRFLOW
Figure 49: Lens Airflow