Traffic signals in tunnels are essential to influence the traffic in case of danger or incidents. The states of traffic signals have to be monitored to ensure tunnel safety.
Traffic signals in a tunnel are con-trolled by the tunnel control system which is connected to the traffic signal controller via common PLC inputs and outputs.
The traffic signal controller switches the traffic signal states (red, yellow, green) according to commands from the tunnel control system and reports back the actual operational state of the traffic signal.
In case of defects (open circuit, defective lamp) an error is indicated. Illegal operational states (e.g. red and green) are avoided, in such cases the traffic signal shows flashing yellow.
Features
Controlling and monitoring of traffic signals through PLC
Monitoring of LED modules when switched on
Monitoring of conventional lamps when switched on and switched off
Monitoring for open circuit
Avoidance of illegal traffic signal states
Support of night dimming
Operation and fault indication for every signal (red, yellow, green) and sum fault indication by digital outputs
Versions for 1-, 2- or 3-state traffic signals available
Visible LEDs in the front panel to indicate the signal states
Traffic light controller as 19-inch slide-in 3 HE, 8 TE
PCB as eurocard (acc. DIN 41494, Teil 2)
Pluggable into multipoint connector DIN 41612 H7/F24.
Advantages
Specifically developed for application in and in front of tunnels
1-, 2- or 3-state signal versions in same format
19-inch slide-in technology for easy and quick exchange
Versions for conventional lamps can be exchanged for LED versions if traffic signals are replaced
Visible LEDs to indicate signal states and faults.
