Wireless traffic light controller features
The wireless traffic light controller, because of its wireless technology has gained fame. Because it takes no cutting of roads, laying of cables, hence the maintenance cost reduces. Further, the system is automatic, timing based and programmable. The controller is custom designed for multi-road junctions and different traffic sequences. But the sequences varies as per customer necessity and traffic conditions. Moreover, these sequences can cater a wide variety roadways and railways applications.
The set comprises of master controller and many slave controller units. Firstly, the master unit sequences the light patterns. The slave units have (potential-free) relay outputs points. Each potential free contactor point drives a light (red / amber / green). Depending on the sequence and timing patterns a particular light glows or dims.
User needs to program the master controller unit as per the traffic sequence needed. These sequences contain individual timing of Red->Amber->Green, Flash light timing. Likewise, idle times, and 2 or 3 or 4 road junction sequences is also programmed in the master controller.
Master and slave controllers
This traffic light controller system can also operate in manual mode. Further, each road has a dedicated emergency button to turn on the light green for a particular road . This feature enables traffic constables to allow the movement of emergency vehicles.
A master controller is mandatory at a particular junction. It controls the slave controller units by sending radio commands. Receiving the commands the slave controller switches the lights in a particular sequence. All timing parameters are pre-programmed in the slave for switching the lights. The timing values operate at an accuracy of +/- 0.5seconds.
Moreover, it is possible to program the flashing time (say from 11PM to morning 6AM). During this time all the road amber lights would be in a blinking mode.
The slave unit’s relay can drive AC or DC loads of traffic lights. The limit of load capacity of the relays: 7A/250VAC or 10A/125VAC or 12A/120VAC or 10A/28VDC. The load capacity of the LED or traffic lights should not be more than the specified ratings.