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Thales Axle Counter Essentials Presentation

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Geetha Somasundaram

on 21 April 2014

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Transcript of Thales Axle Counter Essentials Presentation

Activity 1

Corporate capability video

Topic Nine: Allocation of Evaluators - MNDT

Topic Nine: Allocation of Evaluators - MNDT

The ‘first’ and ‘last’ detection point connected to each axle counter will be configured as a ‘single entry – single exit’ ‘superblock’ track section which will be used to monitor the overall health of the intermediate track sections. The status of the superblock will be used to condition the resetting of the intermediate track sections.

Topic Eight: Supervisory Block

Topic Eight: Reset Procedures

The reset is required to clear an axle counter section:
during commissioning
when it has become disturbed

Resetting axle counter sections is a safety relevant operational procedure which must be clearly defined in rules for the operator and maintainer.

Topic Seven: MNDT Block Section Design

An evaluator (ACE) for monitoring all sections on the UP line in the UP direction from the station;
An evaluator (ACE) for monitoring all sections on the DOWN line in the DOWN direction from the station;
Where the block section being monitored by the ACE is > 12km, the ACE function will be split into 2 separate evaluators, each having its own processors, rack and power supplies

Topic Seven: MNDT Block Section Design

Topic Six: Basic Counting Logic

The axle counter system evaluates the differences in count values established by the detection points of a section.
A reference direction is defined in the site specification data to enable the system to count axles based on the order of wheel pulses detected

The detection points:
count the number of axles passing the heads and the direction of travel
transmit this data to the neighbouring detection point (AzLS) or to the ACE (AzLM) for evaluation

Ansaldo Academy

Course Review

Topic Seven: AzLM Application Design

Topic Seven: AzLM Configuration

Topic Five: MNDT System Configuration

Tea Break

End of Topic

End of Chapter - 3

AzLM Components – Serial I/O

End of Chapter 2

End of Topic 1

Introduction to Axle Counters

Ansaldo Academy

Essentials

Thales Axle Counter

Counting In

How axles are counted

Basic Counting Logic

Basic Counting Logic

How axles are counted

Axles are counted into the section when:
a train passes detection point #1 in the direction of the arrow OR
a train passes detection point #2 in the opposite direction to the arrow

Axles are counted out of the section when:
a train passes detection point #1 in the opposite direction of the arrow OR
a train passes detection point #2 in the direction of the arrow

Communications and Transmission Path

Power/Data Coupling Unit

Topic Four: Communications and Transmission Path

The AzLM system can use a few different methods to power and transmit messages to the ACE:
directly from the trackside equipment to the ACE using standard communication cable (twisted pair or star quad)
Powered from an equipment room with the use of a Power/Data Coupling Unit (PDCU)

Data from the trackside equipment is received via serial I/O modules.
occupies one I/O space in the cardfile
Sends decoded data to the vital CPUs
A CAN bus is used to interface the Serial I/O cards to the CPUs
Each board can connect to 2 detection points

Indoor Components – Serial I/O

Supplies the CPU with regulated 5V and 12V lines
is installed in the slot to the left of the CPU card

Indoor Components – Power Supply

CPU

Indoor Components

Equipment Room

Indoor Components

The Digital Board

Track Side Components

Track Side Components

The Analogue Board – Wheel Pulses

The Analogue Board

Track Side Components

Electronic Unit

Track Side Components

Topic: One: Introduction to Axle Counters

Train Detection:

Safe separation of trains ensured by dividing the track into sections
Only one train on a section at a time
Early days: signalmen were used to verify the clear section
Increased speed, traffic density and high demand for safe automatic detection methods became desirable
Two popular methods of track occupancy detection are Track circuits and Axle Counters.

After completing this training you should be able to:
Describe the features and capabilities of the AzLM and advise peers, clients on situations suitable for use of each system
Describe the benefits to track circuit implementations and recognise the components of each system
Understand the AzLM train detection / counting method and Reference Direction
Have a basic understanding of how the AzLM interfaces with the communication system and interlocking system (Microlok II)
Differences between Axle Counter and Track Circuit Blocks / Impact on KTMB rule book

Course Outcomes

Un Conditional Reset

Reset Procedures

Activated using the local Key Switch and Pushbutton on the parallel card - typically be used following engineering or maintenance activities when the local operator can be sure that the section(s) are in fact clear.
This mode of reset will also be available to access via the Local Control Panel or Train Control System for those sections in which a ‘superblock’ section is being monitored by the interlocking and proved to be clear.
The operator must ensure that there is no vehicle in the section before executing the reset


CPU

Indoor Components

The computer module has two configurations:
redundant 2 out of 3 computer system
2 out of 2 version without redundancy
The CPU cards are equipped with a redundant Ethernet data interface to ensure high availability

Equipment Room

Indoor Components

The basic indoor equipment consists of the ACE cardfile, which comprises:
Vital computer module
Power supply
Serial I/O
Parallel I/O

The card files are designed for installation in both open racks and enclosed cabinets.

Track Side Components

Electronic Unit - mounting

Change in Magnetic Field

Track Side Components

Double Rail Contact

Track Side Components

Detection Point

Track Side Components

Topic Two: Track Side Components

Each track section is surrounded by a detection point on either side.
A Detection point consists a set of double rail contacts and a mounted electronic unit

Introduction to Axle Counters

Axle Counter comparison to track circuits

When compared to track circuits:

Immune to traction currents (both AC and DC type) and its harmonics

Can be added as an overlay to existing track circuits for decommissioning at a later time

Simplified setup – signalling bonding is not needed as the system is electrically isolated from the rails

Not reliant on track conditions (ballast, rusty rail) or wheel conditions

How axles are counted

Basic Counting Logic

Counting Out

Basic Counting Logic

Communications and Transmission Path

Used to increase the maximum cable length between the detection points and the electronic unit
Increases the length by 25m

Rail Contact Adapter

Communications and Transmission Path

RuggedCom RS400

Track Side Components

Electronic Unit - mounting

mounted on a stand near to the rail contacts
housed under a protective cover.

The appearance of the stand and cover gives it the nickname of a “Mushroom head”

Track Side Components

Mechanical Aspects

The rail contact is fitted by three bolts to the web of the rail.

Double Rail Contact

Track Side Components

Consist of two sets of two coils mounted on both sides of the same piece of rail:

Transmitter (Tx): mounted on outside of rail, generates the electro-magnetic field

Receiver (Rx): mounted on inside of rail, supplies the electronic unit with two time-offset voltages to the electronic unit

Passing axles alter the electromagnetic field’s properties, and thus the time-offset voltage sent to the electronic unit.

AzLS Power Supply

Track Side Components

Detection point power is usually supplied from an UPS and can accept the following voltages:
24V DC (locally supplied version) OR
60 – 120V DC (allows for voltage drop over long cables)
Axle Counters

Introduction to Axle Counters

Can be used as a direct replacement for track circuits
Do exactly as their namesake, they count the number of axles in, and out of a track section and evaluate whether the track section is occupied or not
If axle count = zero, then a “track free” message is sent to the interlocking
Otherwise, an “occupied” or “disturbed” message is sent.

Track Circuits

Introduction to Axle Counters

A voltage is run through the rails to detect if the track section is free of trains
When a train enters the track section, the axle shorts this voltage causing the circuitry to detect the presence of a train
Require a direct interface to the rail: complex bonding circuitry is needed to ensure separation to the traction power
This leads to track circuit layout requiring many hours to design and many more to commission!

Agenda

09:00 ~ 09:30 Introduction – Overview of course sessions and objectives
09:30 ~ 10:00 Topic One: Introduction to Axle Counters
Topic Two: AzLS Components
Topic Three: AzLM Components
Topic Four: Communications and Transmission Path
10:00 ~ 10:15 MORNING TEA BREAK
10:15 ~ 12:00 Topic Five: Basic Counting Logic
Topic Six: AzLS Configurations
Topic Seven: AzLm Configuration
Topic Eight: Reset Procedures
12:00 ~ 12:20 Knowledge Assessment
12:20 ~ 12:30 Course Rap-up – Key Points

How axles are counted

Basic Counting Logic

Splitting a Train

Power and Communications

Communications and Transmission Path

For non-copper cable transmission systems, an ISDN/V.24 converter is available

Parallel I/O

AzLM Components

track occupancy information is output from the CPU via the Parallel I/O card via the CAN bus
Output is via two (double cut) vital relay contacts that comply with EN 50205
two optocoupler inputs
One key switch on the front panel for reset commands
two non-vital outputs available for:

Electronic Unit

Track Side Components

The electronic unit houses the Analogue Board and Digital Boards to perform the following tasks:
Supply power to the TX heads
detect and count the voltage changes from the Rx heads
transmit telegram messages to Evaluator (ACE) unit in the SER
Protection to ISDN line

Axles coming in are added

Axles going out are subtracted

No need for Insulation Joints

No limit on length of track section

New Trend - software controlled design

Detects Train by train axle shunting the circuit

May require Insulation Joint depending on type of track circuit

Track circuit length is limited


Axle Counter comparison to track circuits

Introduction to Axle Counters

Types or Models

Introduction to Axle Counters

AzLS = Single Section Axle Counter





2. AzLM = Multi Section Axle Counter

Diagnostic Interface

Indoor Components

Thales Diagnostic software is loaded onto a PC using a DB9 to Micro DB9 null modem cable
There is one diagnostic port on the 2002-ACE and two ports on the 2003-ACE

state indications (occupied, disturbed)
reset command indications
Full transcript