Maintenance and Troubleshooting
4-8
DS12
Red
+2.5V
On when +2.5V power supply is functioning.
DS13
Red
+3.3V
On when +3.3V power supply is functioning.
Product Board
LED Color
Function Operation
DS1
Green
+5V
On when +5V power supply is functioning.
DS2
Green
+3.3V
On when +3.3V power supply is functioning.
DS3
Yellow
COM1 TxD
Flashes when transmitting serial information.
DS4
Yellow
COM1 RxD
Flashes when receiving serial information.
DS5
Yellow
Light
Flashes when receiving signal from light sensor
DS6
Yellow
Com 2 RX2
Normal state is ON. When connected to receive RTD input,
the LED will be OFF. The LED flashes when receiving
signal from RTD input device.
Temp Sensor
LED Color
Function Operation
DS1
Green
+5V
On when +5V power supply is functioning.
DS2
Red
Run
A steady flash indicates the controller is running correctly.
Normal flash rate is about once a second. Flashes faster
when the sensor is transmitting temperature or light
information.
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, for whatever reason, take a minute to
inspect the fans
•
Check the fan blades for dirt and debris; cleaning them and the inside of the
display if necessary – 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 A103, top row, and third 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
