Appendix 2 Requirements on trackside hot wheelset bearing detection (‘Hot Axle Box Detection’) Systems

This part of TSI defines the requirements on trackside components of Hot Axle Box Detection Systems (HABD) and deals only with the Class A system.

Rolling stock concerned are those which are intended to be used on 1435mm track gauge.

Vehicles equipped with onboard hot wheelset bearing detection and shielded against trackside hot wheelset bearing detection need therefore not to be considered here.

The target area is defined as that surface of the wheelset bearing box which

• has a temperature related to the axle bearing temperature and

• is completely visible for vertical trackside scanning.

The target area of vehicles is described by transverse and longitudinal dimensions. The target area is therefore defined as a characteristic of rolling stock and is originally defined in vehicle-side co-ordinates.

The scanning range is as a characteristic of the HABD System and its mounting and originally defined in track-side co-ordinates.

Target area (rolling stock) and scanning range (HABD) are interfacing each other and have to overlap.

Figure a) gives an overview and shows details for the following definitions.

HABD Systems shall have a scanning range being able to measure a hot target area of 50mm within de1 = 1 040mm to de2 = 1 120mm related to the centre-line of the vehicle at a height above top of rail between h1 = 260 mm and h2 = 500 mm (minimum range).

HABD-System shall measure axle boxes in a longitudinal scanning range corresponding with longitudinal target area dimensions from 80 mm up to 130 mm in the velocity range from 3 km/h up to 330 km/h.

For higher speeds the values will have to be defined when necessary.

The centre of the detection area of the HABD shall be mounted at a distance from the track centre line which guarantees the values given in 1.2. and which may consider rolling stock still not following the requirements of TSI Rolling Stock. Therefore this distance is not given by this TSI. This way the HABD should be able to detect all kind of hot axle box constructions.

A vertical scanning is highly recommended.

The HABD shall build the following alarm-types:

• hot-alarm

• warm-alarm

• difference-alarm or other type of alarm.

The technical specification — including EMC requirements — has to be mandated.