An Insight Into Multi Section Digital Axle Counter (MSDAC-G39)

An Insight Into

Multi Section Digital Axle Counter (MSDAC-G39)

As per RDSO Specification No.

RDSO/SPN/176/2013 Ver. 3.0

Distribution and Revision

An Insight into MSDAC-G39 2

Prepared by Sridharan G

Approved by Karthikeyan S

Version 16.0

Date March 2020

MSDAC-G39 Overview

◼ 2 out of 3 architecture based fail-safe system

◼ System includes Central Evaluator(CE), Field Detection Point(FDP), Track

device(Sensor), VDU panel, Relay Panel, Reset Box and Remote Diagnostic Unit

◼ Designed to meet EN50126, EN50129, En50128 and En50159 CENELEC Standards

◼ System works well with both Phase reversal technique based track device (i.e. Tx/Rx)

and EWS-G39 track device (Eddy Current based)

◼ Perform safety functions including axle detection, axle counting, vital relay driving, Train

Speed measurement, Wheel diameter measurement, 2oo3 voting, system

communications at SIL 4 level

◼ Support wheel counting at wheel speed of 250Kmph conventional sensor and up to 400

Kmph EWS – G39 sensor

◼ Better reliability with triple modular redundancy to drive section status output (VR)


Certification Progress

◼ RDSO Functional testing completed

◼ Reliability Testing completed at NABLaccredited laboratory

◼ Completed Independent SafetyAssessment by M/s. Bureau Vertias,Italy

◼ Attained Certification of Conformity toEn50126, En50128, En50129 andEn50159 CENELEC codes.

◼ Under final field trial (standalone) inLottegolahalli to Yelahanka stationBangalore Division, SWR


MSDAC System Salient Features

◼ All modules are Hot swappable. CPU hot swapping takes less than one minute aftersynchronizing with the other working CPU’s.

◼ Self Diagnostic and application data validity checking between CPU’s done at a regularinterval of time.

◼ Provide track section status output as 24Vdc to drive VR Relay (24V Q Type)

◼ Provide track section status as data compatible (Modbus protocol) with Interlockingsystem incudes Section Clear / Occupied, Train Speed and Diameter details.

◼ Support reset types including Preparatory Reset, Cooperative Reset and Direct clearReset.

◼ Reset can be done through Reset box or from VDU panel (Software reset).

◼ EWS-G39 track device replace the total field electronics Field Detection Point (FDP) unit.

◼ System features encrypted data transmission in case of open communication meetingCenelec 50159 Category 3


MSDAC System Salient Features (Continues…)

◼ All system communications have the redundant facility with auto change over function.

◼ Track Sections and Digital Inputs can be shared between two MSDAC systems.

◼ 2 Vital Outputs can be driven at each Field Detection Point

◼ System information like health status, wheel counts and error messages are displayed constantly onthe VDU panel.

◼ Display Train Speed and Diameter of wheel passing at every Detection point in VDU.

◼ Event Logging facility (up to 50000 events)

◼ Direct Connectivity to Railway Data Logger

◼ Remote Event Downloading facility available through internet connection .

◼ 1 out of 2 Power supply arrangements available in CE for availing hot standby.

◼ FDP works with Centralized 110 VDC via quad cable on PLCC mode or with 43-160 VDC in case ofLocal power supply available at field.

◼ Built In Multiplexer facility up to NVI – 16, NVO – 16, VI – 16 and VO – 16. These Non Vital and VitalI/O to support exchange of vital and non vital information between Evaluators enhancing systemcapabilities and reduces additional object controllers or UFSBI instrument for BPAC / IB / ASapplications.

◼ MSDAC system is connected to IOT applications for easy remote diagnostics, monitoring and eventdownloading.


Application of MSDAC-G39

MSDAC-G39 may be used to monitor track section in the following areas

◼ Station Main Lines and Loop Lines

◼ Point zones and Mid Section diversions

◼ Block Section between stations

◼ Intermediate Block Signaling

◼ Automatic Signaling

◼ LC-Gate Interlocking and Train Warning System

◼ Multiplexer functionality between systems

◼ ATP with train speed data

◼ BPAC with MSDAC and Multiplexer built in facility


MSDAC-G39 System Architecture


MSDAC-G39 System Architecture Schematic


Continues..


RemoteEventDownloading

MSDAC – G39 System connectivity


OFC/ISDN/RF/E1

Applications of MSDAC


Applications of MSDAC (continues…)


OFC/ISDN/RF/E1 REDUNDANT COMMUNICATION BETWEEN MSDAC TO MSDAC

MSDAC-G39 Technical Specification

◼ Central Evaluator System MSDAC-G39

◼ Input Power Supply : 9-36 VDC / 18-72 VDC

◼ Architecture : 2 out of 3

◼ Detection Point’s : supports up to 40 DP’s

◼ Local Track Section : supports up to 40 Sections

◼ Shared Track Section : supports up to 12 sections can be shared.

◼ VI & NVI : supports up to 40 Inputs

◼ VO & NVO O/P : supports up to 16 Outputs ( Multiplexed at remote MSDAC or FDP )

◼ System Interfaces - VDU : Isolated RS232 / RS485,

Event Logging : Isolated RS232,

RDL : Isolated RS232 & FSK,

Remote Event Downloading Via Ethernet

CE to CE : RF / ISDN ( Copper ) / Fiber / E1 dual redundant

CE to FDP : FSK ( Copper ) and RF / Fiber dual redundant

◼ SSI / EI Interface : High speed Isolated RS232 & RS485. Ethernet LAN : Web

◼ Section reaction time : Occupancy < 1Second, Clearing < 2.5 Seconds


MSDAC – G39 Basic Chassis – 12 I/O


MSDAC – G39 Extended Chassis 16 I/O


MSDAC – G39 for SSDAC / HASSADC Chassis 4 I/O


FDP-G39 System Technical Specification

◼ Field Detection Point (FDP)

◼ Input Power Supply : 43-160 VDC / 18-72 VDC / 9-36VDC , 12 Watts Max.

◼ Architecture : 2 out of 2

◼ Detection Communication Interface : V.23 1200 BPS & Isolated RS232 onredundant communication

◼ Communication is secured by encrypted data.

◼ Driven Vital Output : 2 Maximum per DP as optional

◼ DP Communication Interface : V.23 1200 BPS Interface to CE & Isolated

RS232 redundant communication for Fiber / E1 or Radio

◼ Supports Train Speed passing at every DP and wheel Diameter measurement

◼ Distance to CE :

On 0.9 Sq mm Quad Cable, 4 Km’s with Centralized Power Supply 110 VDC

On 1.4 Sq mm Quad Cable, 6 Km’s with Centralized Power Supply 110 VDC

25 Km’s with local Power Supply


FDP – G39 unit


FDP-G39 – With 2 Vital Relay

VR option FDP-G39A – Without 2 Vital

Relay VR option

Conventional Tx/Rx Sensor –

Rail Drill type

Conventional Tx/Rx Sensor –

Base Clamp Mounting type

FDP Models

◼ FDP can be used in various configuration as follows,

◼ 1C1E

◼ 2C1E

◼ 2C2E


Axle Counting Mechanism – Conventional Sensor


▪ Digital Axle Counter system works in Phase reversal principle for counting / detecting thewheels through track devices.

▪ Transmitter voltage is fed to transmitter winding to build magnetic field. This Magnetic field iscoupled to receiver coil through magnetic coupling.

▪ Whenever Wheel passes over the RX coil, the flange of the Train wheel cuts the magnetic fluxinduced between TX and RX.

▪ Solid mass of the wheel can block the signals and some flux lines are reflected through flange.

▪ The flange of the wheel can reflect the magnetic flux in to RX coil for creating phase reversal.


Axle Counting Mechanism ( Conventional Tx/Rx wheel sensor )

No Wheel Condition


Axle Counting Mechanism ( Conventional Tx/Rx wheel sensor )

Wheel Condition

EWS-G39 wheel sensor


Eddy Current Wheel Sensor Model – EWS-G39

Base Clamp Mounting Type

EWS-G39 – Salient Features ( Optional Wheel Sensor )

◼ The EWS-G39 Sensor works on frequency band of 1 300 – 330 KHz as specified in CENELEC

Standards EN50617-2 2016 & AC:2016 section 6.2.2 Band 1

◼ No Field Electronics, No Field location box / Mushroom Box, No field maintenance

◼ Train speed up to 400 Kmph

◼ Unique addressing feature for safe operation

◼ Provision for configuring different types of Trolley wheels for Rejection

◼ Single pair of Quad copper cable with V.23 CCITT Standard communication with PLCC support

◼ RS485 Redundant communication to support OFC Fiber connectivity

◼ Protection against removal of Sensors from Rail section

◼ Supports both Centralized and Local power supply arrangements with wide Input Voltage

range of 40 VDC – 160 VDC. Lower power consumption of 1.2 Watts for Model-1 and 3 Watts

for Model-2.

◼ Stable operation at -30 to +70 Degree Celsius

◼ Drill free fixing with Base clamp support.

◼ Rugged housing with IP68 capability.


EWS – G39 – Salient Features

◼ Shock free design with Rubber based Resin filling.

◼ Special locking type fool proof bolt fixing arrangements to prevent from sabotage

◼ The EWS-G39 Sensor is a fail safe reliable 2oo2 architecture based axle sensing / counting

sensor can be used with MSDAC – G39 Evaluator System

◼ Connects directly to MSDAC – G39 Evaluator without need of any electronics in the Field

◼ Ideal for medium distance axle sensing / counting up to 12 Km’s

◼ Supports Train Speed passing at every DP and wheel Diameter measurement

◼ EWS-G39-TR1M00-0-R1 : Quad Cable Interface with Single pair for FSK V.23

communication. Supports Centralized Power Supply and Local Power Supply

◼ EWS-G39-TR1M00-0-R2 : Quad Cable Interface with Single pair for FSK V.23

communication and RS485 Interface for OFC Fiber communication in Redundant mode.

Supports Centralized Power Supply and Local Power Supply


Single Sensor – Models

◼ EWS G39- Model 1 : Quad Cable Interface with Single pair for FSK V.23 communication.

Supports Centralized Power Supply and Local Power Supply.

◼ EWS G39- Model 2 : Quad Cable Interface with Single pair for FSK V.23 communication and

RS485 Interface for OFC Fiber communication in Redundant mode. Supports Centralized Power

Supply and Local Power Supply.


Single sensor connected with CE


OFC/ISDN/RF/E1

Axle Counting Mechanism ( EWS Eddy Current wheel sensor )


Magnetic field when no wheel No change in Frequency and impedance(RP)

Voltage

Magnetic Field

Track

No Wheel Condition

Axle Counting Mechanism ( EWS Eddy Current wheel sensor )


Magnetic field with wheel

Change in Frequency and impedance(RP)

Voltage

ChangedMagnetic Field

Track

Wheel Condition

Hardware Modules – MSDAC-G39

◼ MCPU : CPU Card (MCPU1, MCPU2 and MCPU3)

◼ Failsafe 2 out of 3 architecture for controlling and monitoring the MSDAC for reliableoperation.

◼ Houses the system software that schedules the overall operation as per configuration.

◼ MDC : DC-DC Converter (MDC1, MDC2)

◼ Generates required multiple power outputs from 24 VDC input (9-36 VDC / 18-72 VDC).

◼ Front Panel Provision for Switch and Fuse.

◼ MCE : Communication Controller

◼ FSK and Isolated RS232 for Railways Data Logger Interface (5 pin phoenix)

◼ Two Isolated RS232 & Two Isolated RS485 ports are dedicated to Visual Display Unit toredundancy purpose. (10 pin phoenix)

◼ Downloading Events with Isolated RS232C Interface (DB9 Female Connector - Frontpanel).

◼ MCOMM : Modem Card

◼ Two Isolated RS232C interface available for each channel.

◼ In MCOMM Modem 2 independent channels are available to communicate with bothdirection of MSDAC ( 2 x 5 pin phoenix).


Continued ….

◼ MLAN: Ethernet Controller

◼ Ethernet interface through RJ45 magnetic type with inbuilt Ethernet transformers and LED’s – FrontPanel

◼ Through the same Ethernet connection remote downloading can be done via IP Address.

◼ Isolated RS 232 & RS485 interface for EI / SSI

◼ MDP : DP Card ( supports 2 DP system interface to FDP-21/25 )

◼ Each DP card has 2 No’s of V.23 FSK 1200 BPS Modem/Isolated RS232 and 2 No’s of dedicated RS232Interface with isolation (10 pin Phoenix )

◼ 2 No’s of Vital Input and 2 No’s of Non Vital Input (8 pin Phoenix)

◼ MSC: Section I/O Card

◼ Each MSC card has a section 24 VDC Vital Output for Relay Interface

◼ High Availability 2oo3 output drive

◼ 1 No of Vital Output and 1 No of Preparatory Relay O/P with 2 feedback (12 pin Phoenix)

◼ 1 No of Non Vital Output and 1 No of Relay Reset Input (5 pin Phoenix)

◼ MCFI: Failure Indicator Card

◼ Every MSDAC system will have a MCFI Card which indicates the hard error of the MSDAC

hardware modules.

◼ MCFI card has two error outputs. One is CPU error and another one is I/O Error.

◼ MCAN: Controlled Area Network

◼ Communication between the chassis is happening via MCAN card.

◼ Two CAN BUS connectivity's are available in this for redundant purpose. (2 x 5 pin Phoenix)


VDU Panel


Insight view of Remote Monitoring & Diagnostic Display


Reset Philosophy

◼ Types of Reset

◼ Hard and Soft reset available

◼ Each section can be Reset individually and Globally. Authentication using RFID Tag for

station master

◼ Co-operative Preparatory Reset

◼ Direct Reset with LV support. Both Hardware and Software ( VDU ) supported

◼ Conditional Reset (Direct Clear – Conditional minimum one out count)

◼ Reset can be initiated through VDU

◼ Voltage Window Reset at 48 VDC

◼ Reliable Reset procedure through Microcontroller ports thereby immunized to spikes

◼ The Reset operation through VDU panel can be initiated by only authorized person

using RFID tag for global Reset ( All sections ).


Hardware Reset Module


Modular construction

◼ Reset Modules are available in MSDAC reset Unit for generating the 48

VDC Reset pulse. Basic Reset Chassis can handle up to 6 section

Resets. Extended Reset Chassis each chassis can handle up to 4

section Resets with Common SM Key.

◼ Individual Reset Button for each section, with Reset Timing Software

filter ( 1.5 seconds to 6 seconds qualified and 5 seconds Reset

generated ). Section status Indications and Reset Counter to indicate

number of Resets / section

Software Reset Through VDU panel


Step 1 : Press Ctrl + S

Step 2 : Press SM Key shown in VDU Display

Step 3 : Press Reset Button (RED)of particular section . It will become yellow when reset in process

Software Reset Through VDU panel (Continuous..)


Event Downloading Software


Event Downloading Software (Continuous..)


System Configuration Software


System Configuration Software (Continuous..)


Conclusion

◼ MSDAC-G39 and FDP-21/25 system is fail safe, reliable & user friendly. Hot swapping of card

modules assist easy maintenance and reduces down time.

◼ User can buy options of smaller configuration from MSDAC-G39-12 I/O with 12 I/O Slots to

Higher configuration of MSDAC-G39-28 I/O with 28 I/O and MSDAC-G39-44 I/O with 44 I/O

chassis for cost effectiveness

◼ Built in Multiplexer helps reducing cables between station

◼ Secured transaction(Encrypted) for wireless communication in line with EN50159 Category 3

◼ Redundancy available for all communications with auto change over facility.

◼ Small configuration chassis MSDAC-G39-12 I/O configuration can handle easily IBS and

Absolute Block Section applications

◼ Big Station section can be configured with MSDAC-G39-28 I/O or MSDAC-G39-44 I/O chassis

◼ Support of Centralized power supply of 110 VDC can feed all DP’s via communication Quad

cable on PDC mode up to 4 Km’s with 0.9 Sq mm cable and up to 6 Km’s with 1.4 Sq mm

cable with half quad

◼ IOT connectivity supports remote diagnostics, remote monitoring, remote event down loading

of events and charting of all train movements


contact us at

G.G.Tronics India Private Limited,

Plot No : 10, 3rd Phase, 6th Main,

Peenya Industrial Area,

Bangalore - 560 058, INDIA.

Phone : 91-80-28372449/50/51

Fax : 91-80-28372387

Email : [email protected]

URL : www.ggtronics.com


mailto:[email protected]

http://www.ggtronics.com/

Thank You

An Insight Into Multi Section Digital Axle Counter (MSDAC-G39)

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