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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