A simple traffic light control board that will operate on a timer basis between two directions. It can also be automatically triggered using a ProLoop loop detector, Hercules microwave motion sensor or any other volt free trigger. The control board can be used for pedestrian crossing and traffic light applications at 24Vdc. The red/green traffic lights are connected directly to the board and can be configured for three different modes of operation.
Demand Call Operation
Two sensors with a normally closed relay contacts are connected to the inputs of the control board. The traffic light will start with one direction held on green until there is a call from the other direction via the sensor used to detect the presence of a vehicle at that point. The traffic lights will flow through the sequence where the green will turn to red to allow traffic to pass through the system. After a timed period, the traffic light where the vehicle is waiting will change to green allowing all vehicles travelling in this direction to pass through until there is a call from the other direction. The green traffic light will always stay on the last called direction.
Priority to One Direction
In this application only one sensor is used. Typically this is used where you want priority to vehicles entering a car park from an external access road. The system will show green until their is a call from the other direction for a vehicle to leave. After running through the same timed sequence, the external traffic light will change to and stay on green.
Timed Operation
Sensors are not used in this mode of operation as the system is set to run on a timed basis through the sequence of lights.
Pedestrian Operation
When set to operate as a pedestrian crossing, the green pedestrian light will flash to indicate the lights are about to change to red for the pedestrians. This will only work if the pedestrian clearance is set to a value greater than 8 seconds.
INSTALLATION RECOMENDATION
We recommend that BEFORE you go to site, you configure the system in a workshop. For your comfort, please cover the traffic lights with a piece of paper (they are very bright), then using a normally closed push button switch(es) to replicate the vehicle sensor(s), you can configure the system to your application. By following this advice, you can to see how the system operates and test timer settings for your requirement without the inconvenience of running backwards and forwards from the control board to the lights. Invariably mobile phone signals are very poor in car parks, which makes it difficult for us to give you technical support over the phone..