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KFS SIL2*: Signal Crossing Prevention System
(ATS - Automatic Train Stop)

General Presentation

More information...

Summary

KFS (Signal Crossing Prevention) Block or Rack

The KFS block is an onboard device for electrical and thermal railway systems (train/urban subways/RER/tramways).

Its main objective is to:

Decode information from the magnetic onboard KFS sensor, which is generated by the RPS, KPVA or KFSI Beacon installed on the track between the train’s rails,
And transmit the information to the emergency braking system (VACMA).

The KFS block receives two types of electrical signals from the magnetic sensor:

One is transmitted from a detection stage of the constant magnetic field and produces binary information (R) in accordance with the existence or absence of a magnetic field generated by the ground Beacon (R = 0 (OV) if the field is present, R = 1 (10V) if it is absent).
The second is the image of the sum of low frequency signals (F1:15,36 KHz, F3 :15.36 KHz, F3: 25.6 KHz) from the ground Beacon and received by an antenna set to the useful frequency band inside the magnetic sensor.

The decoding circuit can interpret the combination of signals transmitted in order to lower the corresponding outgoing relay for 160 ms.

The following commands are therefore issued depending on whether the block decodes a magnetic field or not and detects the electromagnetic frequencies (F1: 15.36 KHz, F3: 25.6 KHz):

Detection of a constant magnetic field and two F1 and F3 frequencies: train passage
Detection of a single magnetic field; train stoppage command
Detection of a magnetic field and F3: vigilance command
All other cases: train passage

The KFS block can be mounted onto a European standard box or rack.

Specifications: