Rail level-crossings must be designed even at the planning stage in such a way that the priority of rail traffic over road traffic is clearly apparent. All new level-crossings in Germany must nowadays be fitted with road-side signal lamps with red/yellow aspects, but red flashing lights alone are predominantly used internationally. Our Type SP200 LED (PINTSCH road-side signal lamp with 200 mm optics) with red or yellow signal-generator unit thus logically provide two state-of-the-art solutions.
The red and/or yellow light spots consist of a signal-generator unit which is mounted in the housing-chamber door. The optical system of a light spot consists of a diffuser, a Fresnel lens and a housing with an integrated heat sink. Two channels, each consisting of four LEDs on a metal core board, are used as the light source and assure redundant installation of the light spot, similarly to a two-filament signal lamp. There is a marking indicating “TOP” which denotes the correct installation position on the diffuser.
We improved all optical properties, such as phantoming resistance, colour coordinates and illuminance significantly compared to the familiar signal lamp during the development of our LED signal generator, while nonetheless reducing consumption of electrical energy.
The interface between the level-crossing control system and the flashing light system has, on the other hand, not been modified; the familiar three-wire interface is used here for each light spot. The existing wiring can therefore continue in use if LED signal generators are retrofitted to existing RBÜT systems or if an old-technology level-crossing control system is replaced completely.
The separation of the electronic actuation system in the equipment building and the signal generator on the mast also provides a further important benefit: only the signal generator, and not the complete unit, needs replacement if the signal generator is vandalised.
We have filed patents for this two-channel system extending into the optical system.