TRADITIONAL SOLUTIONS

SITE provides certified expertise in the fields of advanced integration services and telecommunications systems and infrastructures; it designs, produces and installs signalling products and devices that control railway safety.

BCA MULTISEZIONE

AUTOMATIC BLOCK

The Automatic Coded Block Systems (B.A.C.C.) ensure safe spacing of trains along double-track lines allowing the driver to have a continuous early view of the signals ahead, and automatically stop the train in the event of crossing a closed track signal.

OVERALL DIMENSIONS OF THE BRAKESMAN’S CABIN

  • Width: 1,900 mm
  • Height: 2,430 mm
  • Depth: 1,900 mm
  • Weight of the cabin only: 340 kg
  • Material: Fibreglass

USABLE INTERNAL DIMENSIONS

  • Width: 1,635 mm
  • Height: 2,200 mm

The system consists of track circuits fed by encoded currents (block sections), using inductive connections, that are as near as possible to 1,350 m long, but not longer than 2,000 m. The system uses brakesman’s cabins made of fibreglass and positioned near line signals, containing the equipment necessary to receive and generate codes that serve to change signals according to these very codes.

  • For line speeds that do not exceed 200 km/h there are four different codes: 75-120-180-270 transmitted on a 50 Hz carrier frequency
  • For speeds that exceed 200 km/h there are 5 additional codes created by using the same 50 Hz codes but transmitted on a 178 Hz carrier frequency.

The additional carrier frequencies that can be used as an alternative to 50 Hz are 75 Hz and 83.3 Hz.
The B.A.C.C. system can also be used to check the integrity of railway track joints; in case of joint breakage, the system signals that the given track section is closed for traffic.

COMANDO LOCALE DEVIATORIO

LOCAL SWITCH CONTROL

The local switch control (CLD) is a device that can control electronically a local mechanical switch in the absence of its centralised electromechanical interlocking signalling system (A.C.E.I.).
In addition, it always provides control over normal or reverse switches.
The CLD is put to a prominent use during switch assembly and calibration prior to installing the related A.C.E.I. cabin.

This is an easy-to-use device that is at the same time extremely useful and highly reliable, due to the fact that it has no delicate internal components such as relays. One of the advantages offered by the CLD is that the adjustment and tuning of its switch mechanism allow you to skip the need for such adjustments in the later phase of A.C.E.I. commissioning. The CLD is normally used also during maintenance of safety equipment (IS).

The CLD is equipped with an electromagnetic lever for the switching; two keys, one normal and the other reversed; and four indicator lights. The lever and keys are mechanically connected to ensure their correct relative positions.
The CLD operation is very simple.

  • An additional requirement, besides the electric current to power the electromagnet and the switch, is that both keys be inserted into their respective keyholes prior to activating the lever.
  • The lever gets turned to its first intermediate position; at this point the electromagnet is powered, enabling you to proceed to the second intermediate position
  • During this procedure, the reverse switch is tripped and moves the track switch
  • Now the electromagnet is powered up again and the lever can reach its new position
  • Once the checks associated with this new position have been completed, the corresponding key can be extracted to ensure that the positions of the switch, the lever and the key do match
CONNESSIONI INDUTTIVE

INDUCTIVE CONNECTIONS

Equipment used by the Italian Railway systems to ensure continuous flow of direct-current in the return circuits of trains’ electric traction (TE).
Inductive connections offer low resistance to the passage of the traction direct current and at the same time a high impedance to the encoded alternating currents, necessary for detecting the presence of the train on the track.
The inductive connections consist of two windings formed by large cross-section aluminium coils, set inside watertight containers that are suitable for being placed near track joints and embedded in special resin to guarantee their integrity over time.

CHARACTERISTICS:

OVERALL DIMENSIONS

  • Inductive connection 500 A
  • Dimensions
  • Width: 390 mm
  • Height: 375 mm
  • Depth: 550 mm
RIVELATORE DI SQUILIBRIO

IMBALANCE DETECTOR

The imbalance detector verifies that the 50 Hz (or 83.3 Hz) parts of the current in the half winding within the receiving inductive boxes never reach a difference (imbalance) that exceeds a predetermined limit; otherwise it de-energises the track circuit relay and switches the relative signal to closed. The reading of the two rail currents is performed through two amperometric transformers (TA) which transform their voltage ratings proportionately to the input currents. It should also be considered that in the case of a perfect equilibrium of the traction current distribution on the two rails, the current associated with the track circuit on one rail is being added, while that on the other rail is being subtracted, leading to a situation of undesired imbalance. This problem is overcome by introducing a phase inverter into the transmission system. At each code period, the inverter shifts the code current by 180 degrees, thus rendering the value read by the imbalance detector (which has longer time constants) null on the average.

CHARACTERISTICS

Input currents:

  • 24V DC – 0.25 A
  • 48V DC – 1 A

Diagnostics

  • 1 LED repeating the input code
  • 1 LED repeating the output code
  • 1 LED 24 Volt power supply
  • 1 LED 48 Volt power supply
  • Calibration bridges that allow the system to be inserted without needing to change the way the track circuit is regulated

ARCHITECTURAL DESCRIPTION

The imbalance detector consists of the following operational blocks:

  • Input band-pass filter that only allows the 50 Hz (or 83.3 Hz) voltage component to pass to the ends of the receiving inductive box
  • Comparing between the amperometric transformers (TA) output current (appropriately amplified) and ensuring the difference does not exceed the set limit, and consequently adjusting the output signal that energises the track circuit.
SEGNALE DI AVANZAMENTO

GO-AHEAD SIGNAL

The go-ahead signal allows trains to enter the station, with the protection signal off or displaying blocked track.

TECHNICAL SPECIFICATIONS

Dimensions

  • Width: 350 mm
  • Height: 150 mm
  • Depth: 120 mm

Characteristics

  • Aluminium container
  • Mounting: on a signal pole or cantilever pylon
  • Support brackets
  • Power supply 144V
  • Lamps: 125V- 25W
  • Brightness: visibility at minimum distance of 200 m
INDICATORI LUMINOSI A FIBRE OTTICHE

FIBRE OPTIC LIGHT INDICATORS

Light indicators to provide additional information to driver. The system uses separate fibre bands for each required indication.

TECHNICAL SPECIFICATIONS

Dimensions

  • Width: 345 mm
  • Height: 425 mm
  • Depth: 432 mm

Characteristics

  • Signal input voltage: 150V AC
  • Lamp input voltage: 12V AC
  • Lamp Power: 20 W
  • Brightness: visibility at minimum distance of 200 m
DISPOSITIVI DI STABILIZZAZIONE

REGULATORS

Devices supplied to Italian railway (F.S.) personnel on their remote control systems, used for blocking and freeing station tracks not used for line service. It is supplied in a watertight case (made of aluminium or fibreglass) mounted on a special stand and set according to the station protection signals.

TECHNICAL SPECIFICATIONS

Dimensions

  • Width: 320 mm
  • Height: 482 mm
  • Depth: 390 mm

Characteristics

  • Power supply: 150V AC
  • BA9S plug-in lamps: 150V AC 3W
ARMADIETTO CHIAVE RL

RL KEY CABINET

Devices supplied to Italian railway (F.S.) personnel and set on Automatic Coded Block Systems (B.A.c.c.), used to reduce track code flow and consequently the associated speed in the event of work along the line. It is positioned according to the given B.A.c.c. signals. They come in single or double versions.

TECHNICAL SPECIFICATIONS

Dimensions 

Single

  • Width: 18 cm
  • Height: 210 mm
  • Depth: 23 cm

Double

  • Width: 17 cm
  • Height: 36 cm
  • Depth: 23 cm

Characteristics

  • Electromechanical device for outdoor installation
TRASMETTICHIAVE DA BANCO

WORKBENCH TRANSMISSION KEY

The device is used by F.S. operators to ensure that maintenance work is performed in safety, in station areas with remotely-controlled lines. This function guarantees safety by preventing train traffic in the part controlled by the key. Said guarantee is provided by extracting the key after an electronic consent has been received from the Station Operations Manager. The device is normally mounted on special maintenance cabinets located in the Traffic Office.

TECHNICAL SPECIFICATIONS

Dimensions

  • Width: 62 mm
  • Height: 64 mm
  • Depth: 249 mm (mobile connector included)

Characteristics

  • Electromagnet
  • Rated voltage: 24VDC
  • Power: 2.3W at 20°C
  • Coil resistance: 250Ω at 20°C
  • Lamp
  • Red LED: 24V DC
UNITÀ BLOCCABILE TRASMETTICHIAVE

LOCKABLE KEY TRANSMISSION UNIT

A device, supplied to F.S. personnel, that is equipped with a mechanical lock and a key that is normally blocked by an electromagnet. The key can be extracted after having received electronic consent from the Traffic Office Manager and allows the manual operation of the switch and switch lock. It is supplied in a watertight case (made of aluminium or fibreglass) mounted on a special stand and set near the affected switches and switch locks.

TECHNICAL SPECIFICATIONS

Dimensions

  • Width: 320 mm
  • Height: 482 mm
  • Depth: 390 mm
UNITÀ BLOCCABILE TRASMETTICHIAVE

LOCKABLE KEY TRANSMISSION UNIT LOCKING THE HANDLE THAT OPERATES THE SWITCH CONTROL BOX

A device, supplied to F.S. personnel, that is equipped with a mechanical lock and a key that is normally blocked by an electromagnet. The key can be extracted after having received electronic consent from the Traffic Office Manager and allows unlocking the handle that permits the manual operation of the switch. The key cannot be reinserted and locked unless the handle has been repositioned in its seat, ensuring the Traffic Office Manager – as well as the key transmission unit itself – that the handle has been safely reset. It is supplied in a watertight case (made of aluminium or fibreglass) mounted on a special stand and set near the affected switches

DISPOSITIVO CON CHIAVE YALE

DEVICE WITH A YALE KEY

A device, supplied to F.S. personnel, that is used for blocking a switch in its normal position, disconnecting it electrically from the A.C.E.I. The device lever, normally in the “open” position, can be moved to the “blocked” position after having received the consent of the A.C.E.I. by means of the internal electromagnet; this consent allows the lever to exceed the intermediate “A.C.” (awaiting consent) position.
With the lever set in a vertical position, the Yale key can be removed, thus blocking the lever and preventing the switch from being moved by the A.C.E.I. The affected switch can be moved by the A.C.E.I. only after the key has been reinserted and the lever turned to the “open” position. With the lever in the “A.C.” or “open” position, the key remains locked in the device.
It is supplied in a watertight case (made of aluminium or fibreglass) mounted on a special stand and set according to the given station protection signals.

TECHNICAL DATA

The device has two possible applications:

  • PERSONAL PROTECTION – Protects maintenance personnel when working in the station yard. In fact, blocking the switch in its normal position allows the maintenance technician to work safely, guaranteeing that the track where he works is free of moving trains.
  • PERMANENT MANOEUVRING TRACK – This is used in cases where reversing is not permitted between an earth yard and a central station area. It helps avoid badly timed reversing by the A.C.E.I. cabin, while the switch located at the earth yard is about to be used for manoeuvring.