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MAINTENANCE
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7.0 MAINTENANCE
7.1 Introduction
This section describes the maintenance procedure of the traffic signal head installed
in the tunnel for both Free Trade Zone and Midfield Access Road Tunnel.
7.2 General Maintenance
This signal heads interior does not requires any cleaning. The only operation that
might becomes necessary, is the replacement of LED retrofit. Prior to any activities
ensure that the power supply/electricity is disconnected from the unit before replacing
the LEDs. The cleaning of the outside is done with water (if needed use liquid soap)
and a clean rag for the optic.
7.3 Replacing the LED Retrofit
a) The nylon string should be fitted into the groove around the circumference of
the rubber gasket.
b) The nylon string should be crossed over at the part of the lens marked TOP.
It should be pulled to the middle, then place the lens holder on top of the
lens.
Figure 1: Replacing the LED Retrofit A
c) Pull the nylon string upwards while pressing the lens holder downward.
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d) Pull each of the nylon strings alternatively in a symmetrical pattern so as to
avoid turning the lens.
e) Before beginning to pull the nylon string, all parts (210 as well as 300) should
be centered and layed flush on top of one another.
Figure 2: Replacing the LED RetrofitB
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7.4 Periodic Maintenance
Maintenance Details Daily Weekly Monthly QuarterlyHalf
YearlyYearly
Traffic Signal Head
Check and secure wire into
termination pointx x x o o o
Replace faulty LED o o o o o o
Tighten bolt in secure position and re-
torque as necessaryx x x o o o
Check wire termination in secure
positionx x x o o o
Clean glass for clearness x x x o o o
LEGEND: X - Not Applicable, O- Requires
Table 5: Periodic Maintenance For Signal Head
Maintenance Details Daily Weekly Monthly QuarterlyHalf
YearlyYearly
Traffic Control Panel
Check any burnt-outs / replace x x x o o o
Check wire termination in secure
positionx x x x o o
Clean panel tag for clearness to read x x x x o o
LEGEND: X - Not Applicable, O- Requires
Table 6: Periodic Maintenance For Traffic Controll Panel
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7.5 Troubleshooting
7.5.1 Common Problems
Symptom Problem Solution
LED does not light up
1. Input voltage is too low or power
failure
2. Loose connection of LED
3. Short circuit in DB board
4. Fuse Failure
5. Tripping of Circuit Breakers
Check for presence of input
voltage
Tighten the LED
Check the DB board
Replace the fuse
Check the Tripping of circuit
breaker in DB board
Automatic control
failure
Traffic lights does not light up in the
specified order or proper sequence
as programmed on the PLC
Check the PLC controllers
Check the failure of contactor
relay or contactor.
Table 7: Common Problems