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BPAC FOR DOUBLE LINE USING UFSBI
 

Introduction

Block Proving by Axle Counter is a system used for controlling the coordinated movement of the train in the block section working on absolute block working principle. The system has been developed as per RDSO/SPN/188/2004 Ver.1 for double line block working, replacing the traditional double line block instruments.

 

HIGHLIGHTS OF BPAC FOR DOUBLE LINE USING UFSBI (WEBFIL MAKE):

  • Designed for fail safe operation.

  • Triple redundant hardware at all levels with 2/3 decision logic ensures high degree of safety as well as availability.

  • System meets CENELEC & ORE 155 guidelines for safety and reliability.

  • System meets RDSO specification no. RDSO/SPN/188/2004 Ver.1

  • Simple, modular and rugged design.

  • High performance 16 bit Microcontroller used for better software management.

  • CMOS/FET active components to ensure low power consumption and better reliability.

  • Hi-rel components, relays and connectors used to ensure high MTBF.

  • All input-output connections are optically and/or galvanically isolated to eliminate ground noise and earth faults.

  • Rugged communication protocol for transmission of error -free data.

  • Dual power supply in hot -standby mode increases system availability.

  • 16-digit dot-matrix alpha-numeric display for user friendly man-machine interface.

  • Environment specification meets IS -9000.

SYSTEM OVERVIEW :

The Block Proving by Axle Counter is designed to replace existing block instruments, used in railway signaling system. It is a subsystem of Block Proving system and it works with other subsystems mentioned below:
 
Universal Fail Safe Block Interface
Block Panel
Single section Digital Axle Counter
Block Telephone
Quad Cable or Voice channel on OFC
Battery Set
Battery Charger / IPS module
Relay rack with relays
 

SALIENT FEATURES:
 
The BPAC is of 2 out of 3 hardware architecture with implementations of the fail safety principles. It complies with the CENELEC standards and conforming to Safety Integrity Level - 4 (SIL-4).
 
The system incorporates auto features and eliminates manual co-operations from other end for -
Line Clear operation.
Emergency cancellation at the receiving station.
Automatic Train On Line.
Automatic Line Close after sequence proved at receiving end.
Simplified Block Back / Block Forward Operations.
Cooperative Cancellation.
Line Clear Blocking Key (LCB Key) to prevent automatic granting of Line Clear.
Station Master Key (SM Key) to prevent unauthorized panel operations.
Data logger connectivity.
Communication media: (1 pair cable in quad or on voice channel in OFC.)
Block bell and telephone on separate pair of quad or voice channel of OFC.
TECHNICAL SPECIFICATION
SYSTEM SPECIFICATION   Meets RDSO SPN 147/2005
SYSTEM CONFIGURATION   Triple redundancy at all levels including processor
CENTRAL PROCESSOR   Hight Performance 16 bit Intel 80C 196KC Microcontroller
SAFETY COMPLIANCE  
Hardware : CENELEC EN 50129
    ORE 155.A
    RSDO SPN 144 & SPN 147 / 2005
Software : CENELEC EN 50128
I/O MODULES    
Input Module   16 change over input, Opto isolated with transient suppressor
Output Module   16Q series Relay output with 8F / 8B contacts
    Transient protected
    Short circuit protected
Note: Output module needs an Input module for getting feedback from the external signaling relay driven by the system.
 
COMMUNICATION
FSK, V.23   1200 Baud
1302/2097Hz    
4QAM V.22.bis   2400 Baud (not used)
Send level   -8 dBm nominal
Receive Level   -12 dBm nominal
S/N Ratio   better than 20dB for BER 10-6
 
POWER SUPPLY
Configuration   Hot-standby
Input   24 V DC nominal
    21.6 V DC to 28.8 V DC
Output   +5.8 V Dc, +- 0.3 V, 1.5 AMPS (Int)
    +12.8 V Dc, +- 0.5 V, 4 AMPS (Int)
Consumption   20 Watts (nominal) for basic system
(excluding the activation drive of external signaling relays)
Protection   Input : Surge and transients, Overvoltage alarm, Over voltage shutdown, Undervoltage alarm, Undervoltage shutdown
    Output: Overvoltage and short-circuit
Efficiency   >70% at optimum load
ENVIORNMENT   QM333 Catagory B2
Temparature   As per RDSO/SPN/147/2005
Humidity   As per RDSO/SPN/147/2005
MECHANICAL   Sub-rack of UBX 2000 is 19" wide, 6U high
Closed Rack (standard) is 600mm wide, 32U high
 
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