• Traffic Light Controller

SPECIFICATIONS OF LED based SPV POWERED TRAFFIC LIGHTING SYSTEM

LED based Traffic Lights have remarkable advantages in the lighting power, reliability and longer life in comparison with the traditional bulbs. They are available in three colours Red, Amber Yellow and Green. The advantages of using such devices, besides the exceptional lighting efficiency, are their particular radiation angle, allowing to concentrate the light in a very tight angle, which permits the visibility even from long distance and in bad conditions, i.e. when the sunlight comes from behind the traffic light, as well as no "phantom" effect due to the direct sunlight reflex on the parabola through the lens. The electronic controller allows a constant current supply of the LED's together with light control. The controller is designed Working temperature from -20°C to 70°C.

TECHNICAL SPECIFICATIONS

• SUPPLY 24 Volts DC
• CONSUMPTION (MAX.) 10W
• MTBF (ESTIMATED) 100,000 Burning hrs.
• COLOUR OF LED LAMP
• NOS. of LAMP
• SPV MODULE ARRAY
• BATTERY BANK RED, AMBER, GREEN 32 Nos. 500 Wp 24 Volts, 300 Ah tubular plate Lead Acid Battery

GENERAL :

These Traffic Controller have been designed to confirm to Indian Standard specification IS: 7537-1974 & British Standard Specification No. BS:505-71 wherever applicable and standard international practices.The Controller is sold state and has no moving parts. The controller employs fully IC controlled Circuitry on double side glass epoxy PCBs which have been masking to counter, tracking problem and is modular is design, having plug in system for easy maintenance arid operations. System design is such that it takes care of conflicting lights on opposite roads and has' short circuit protection and-optically isolated outputs.

CAPABILITY OF THE CONTROLLER :
The basic controller is capable of being operated in any of the following modes :

1. As an independent fixed time controller at an isolated intersection.
2. As a manually operated controller with operational remote station at police booth. The main frame of the controller will have facilities for extending the capability of the controller for any of the following additional modes of working by addition of suitable modules at any later stage.
3. As a part of micro controller based multi-programmable system.

HARDWARE :
1. CPU : 89C52/51 (Atmel/ Phillips/equivalent)
2. Memory : N V RAM (In Built backup - Dallas) & EEPROM
3. Clock : Built in RYC with 10 years-battery backup
4. Protection : Auto Shut down on power fluctuation beyond limits and Auto up on restoration
5. Output switching : Through solid state devices with zero cross over and optically isolated
6. Input I Output isolation : Output switching isolated from control circuit by optical isolation
7. Police Control Panel : Output OFF, Auto I Manual Step & Flash, L Test
8. Programming Facility : i. PC Compatible by RS 232 communication ii. Built in Keyboard & LCD display
9. Supply Voltage : 170 V to 220 V AC, 50 Hz or 12/5 V DC
10. Power consumption : At AC I/P < 50 Watts. At DC l/P < 8 Watts.
11. Max. Controller load : 4KVA

FEATURES :
• Max number of signal D/P : 32 Nos.
• Number of stage : 1-32 stages
• Max number of signal plans : more than 24 plan
• Max number of day plans : 8 holiday plan + weekly plan 8 per day + 24 routine plans
• Max number of plan transitions : 24 per day
• Max number of holidays per annum : 10

SIGNAL SEQUENCES :
• Vehicular Groups : Red - Green – Amber Blink /ON/OFF mode
• Pedestrian Group : Red – Green Blink /ON/OFF mode

MODES OF OPERATION :
• CABLE LINKING MODE
• FIXED TIME
• MANUAL OPERATION

FRONT PANEL CONTROLS :
The traffic control unit will incorporate the following controls on the front panel:

• ON I OFF Switch
• Control circuit fuse
• Control Circuit Supply Indicator
• Lamp Test Switch
• Stage Indicators
• LCD display 2 Line 16 Digit with Back light
• Keyboard for onsite programming Auto manual switch
• Flash mode switch

CAPACITY :
The basic controller is designed to provide for control of vehicular and Pedestrian traffic having control of 32 outputs, as per requirement. The Controller will be capable of providing any required o/p signal sequence. The controller will have 24 cycle plans (including one for night flashing) It will be possible to "buildup a 24 hours day plan from the combination of Cycle plans such that a particular cycle plan is in operation during any Desired period of the day. It will be possible to provide more than 24 Changes of cycle plans in a period of 24 hours. With the help of keyboard & display unit in Simple English menu, system can be programmed or edited 'at site by operator I police man even without knowledge or training of electronics or software programming.Controller can be programmed for weekdays of the month and for holidays or any special day of the year.

BASIC CONTROLLER REQUIREMENT :
The operation of all signals will be positive without dark intervals or flickering lights. The signal light switching wiring is interlocked to prevent simultaneous display of conflicting green signals.The Controller will have facility to set each stage time for any duration from 1 to 199 seconds. The change from one cycle plan to the next cycle plan will occur at the end of a cycle and not halfway through a cycle. Similarly the first cycle of the new plan will start with stage one and not midway through a cycle. In any day plan, it will be possible to repeat the same cycle setting for multiple cycle plans.

FLASHING SIGNAL :
The controller will be equipped with a reliable electronic flashing unit that would flash Amber signals in the following conditions :

• When the day plan provides for it.
• When fault monitor alarm has detected a fault in the signaling system.
• When switched to this mode by manual control.

The flashing unit will confirm to the following specification :

• A solid state blinker will be provided for flashing Amber signal lights.
• The flashing rate will be within the rang of 30 to 40 flashes per minutes when this voltage varies in the range between +15% and -20% of the nominal values +/- 4% of its nominal frequency.

MANUAL OPERATION :
It will be possible to bring the controller under manual control by operation of auto manual switch in police box. The operation of the switch would result in transfer control over the duration of each stage from the electronic timing unit of the controller through a push button only manual control switch. The sequence of stage preset on the electronic unit will remain undisturbed.Each time of push button is pressed, the current stage will changeover to the next stage in the controller. The duration of the' stage in the manual -control is determined by the interval between successive operation of the push button.A separate over-riding switch is also provided in the police box such that the operation of the switch puts the controller to flashing Amber mode.