Daktronics Galaxy AF-3400 Series, Руководство пользователя

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Maintenance and Troubleshooting
4-12
Power Supplies
The LED power supplies are identified as assemblies. Each power supply unit can
power up to eighteen modules.
The 46 mm, AF-3400 Galaxy displays use red, green and blue LEDs for the color for
RGB displays and red or amber for the Mono displays.
•
Each 13.1 VDC power supply provides power for up to eighteen
modules in a RGB display. Refer to
Figure 22,
Figure 25
,
Figure 23
and
Figure 24
for the 13.1 VDC power display illustration.
4.6 Ventilation Systems
Ventilation fans should be checked after 1,500 hours of operation and every 1,500
hours after that to ensure the display is being cooled properly. Fans should be
checked more often if the display is located in a dusty or harsh weather environment
(i.e. along a gravel road with dust laden air).
•
1,500 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.
•
1,500 hours is equivalent to 62 days if the display is running non-stop for 24
hours a day.
•
Each time a module is removed, take a minute to inspect the fans.
•
Check the fan blades for dirt and debris. If necessary, clean them and the
inside of the display. Fan blades must be kept clean to maintain fan
efficiency and ensure proper cooling.
•
Spin the fan blades with a pen or pencil to ensure that the bearings are free
and the fan is still in balance.
To check the operation of the fans, push the bypass button (momentary contact) on
the thermostat enclosure to temporarily turn the fans on (the bypass button is located
behind A101, top row and first module on the left).
•
Hold your hand or a piece of light paper in front of the display to detect air
movement.
•
If the fan does not turn or does not operate smoothly, replace it.
Make sure the intake vents and exhaust vents on the front of the display are not
blocked and are free of dust or other debris.
4.7 Thermostats
A thermostat controls the operation of the ventilation fans in the display. The
thermostat is typically located behind module A101 as shown in
Figure 27 . The
ventilation fans turn on when the inside of the display reaches 85
°
F (29
°
C) and turn
off at 65
°
F (21
°
C).