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VISION To be World Leader in Railway Products MISSION Enjoying Innovation and Applying Technology for Improving the lives of People Enhancing the image of India in the world, in high Technology

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Propulsion Systems Rolling Stock Equipment Signaling


Medha's ongoing endeavor... to evolve new technology products and systems, meeting present and future requirements of Railways


Propulsion Systems Diesel Locomotives Diesel Multiple Unit (DMU) Electric Locomotives Electric Multiple Unit (EMU) Metros Customized Solutions

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Excitation and Propulsion System for

Diesel Locomotives (for New or Modernized Diesel-Electric Locomotives) Medha offers range of traction and propulsion system solutions for diesel-electric locomotives. The requirement can be for manufacture of new locomotives, renewed life for old locomotives or for technological upgrades. Implementation of complete traction chain may include engine(s), alternator, rectifier, traction converter(s), traction motors, advanced controls, driver console(s), dynamic brake grids, electricals and other sub-assemblies. Solutions are available for different track gauges and locomotive ratings.

<5 years ROI (repowering, rebuilding or modernization of locomotives)

>60% increase in reliability; Increased availability

<2 years ROI (partial modernization)

Increased lease rentals per locomotive; Lower life cycle costs; Reduced maintenance (up to 50%)

>15 years increase in locomotive useful life

Increased horse power rating of locomotives

>20% increase in haulage capacity (improved adhesion)

Reduced lube oil consumption (up to 70%)

>20% reduction in fuel consumption and harmful emissions

Advanced safety features; Fault diagnostics and remote monitoring over internet

Customer Choice New or Rebuild Locomotives

Repowering and Reconfiguration

(rating 1200 HP to 5500 HP) AC or DC traction locomotives, complete traction chain or rebuilding of existing system

(rating 700 HP to 3000 HP) Out-of-frame building of condemned, scrapped or non-operational locomotives

Conversion

Upgrade

(rating 2000 HP to 4500 HP) DC traction to IGBT based AC traction system with microprocessor controls and AC traction motors

(rating 2000 HP to 4500 HP) Thyristor and GTO based system to IGBT based traction

Panel with Control System and Electrical Switch Gear

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Propulsion Systems

IGBT based Traction Converter including Traction Computers

3Ď&#x2020; AC Traction Motor

Hotel Load Converter (Head End Power)

Driver Desk with TFT LCD Displays


5 4

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7

ELECTRICAL CONTROL CABINET - ECC #2 TYPE SL. NO.

MCP 461 1001

LOCO TYPE

WDG4 / WDP4

MFG.

08 / 07

MEDHA SERVO DRIVES PVT. LTD., P-4/5B, IDA, NACHARAM, HYDERABAD - 500 076.

DLW ORDER NO.: 060580540 . 06284993 DATE : 24.05.2006

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8

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Engine (MFI, EFI or CRDI)

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Driver Console (with TFT LCD displays)

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2

Alternator (AC)

6

Hotel Load Converter (HEP)

10 Fuel Level Sensors (Ultrasonic type)

33

Traction Converter (IGBT Based)

7

Dynamic Brake Resistor (DBR Grids)

3 Locomotive Remote Monitoring (LRMS) 11

4

Control Panel (Microprocessor Control with electricals)

8

3 Traction Motors (AC)

Upgrade from GTO to IGBT with locomotive power enhancement

Electronic Governor / CRDI (Retroď&#x20AC; t)

Out-of-frame rebuilding of scrapped locomotives

4000 HP locomotive upgraded to 4500 HP (wide gauge), GT46MAC, EMD 710 engine, 3 MW IGBT traction converter, individual motor control, 500 kVA HEP, distributed power control, remote monitoring

2000 HP (meter gauge), dual airconditioned cabs, 1800 rpm MTU CRDi engine, UIC compliant brake system, microprocessor controls, TFT LCD driver console, CAN interface with engine control unit, remote monitoring system

3000 HP (cape gauge), GE engine and alternator, DC traction, microprocessor controls, dynamic brake grids, TFT LCD driver console, remote monitoring

Locomotive modernization with microprocessor control implementation, additional features including event recording, vigilance control, remote monitoring, fuel level sensing etc.

3000 HP (standard gauge), GT26CW, EMD engine and turbo charger

2200 HP (standard gauge), GT26, EMD engine, without turbo charger

1250 HP (meter gauge), YDM4, 1050 RPM engine with 8 inline cylinders

3000 HP locomotive with gauge change (cape gauge), WDG series, 1050 RPM, 16 cylinder engine

2400 HP Locomotive (meter gauge) with Pielstick engine

Propulsion Systems

7


Propulsion System for

Diesel Multiple Unit (DMUs) Medha, as a DMU propulsion system supplier, offers design, manufacture, supply and commissioning of single or multiple diesel engine based, complete propulsion system along with train control and communications for Diesel Multiple Unit (DMU) vehicles with power rating from 700 HP to 2200 HP. Client requirements includes - design and manufacturing of new DMU trainsets, repowering and/ or rebuilding and modernization of existing trainsets or upgrade of old DMUs. Repowering, rebuilding and/or moderization of existing trainsets and other sub-systems is to suit customer requirements. Repowering or Rebuilding of DMUs

Increased power rating

Increased acceleration and shorter braking distances

Increased seating capacity (200-350 seating capacity/unit)

Reduced breakdown and maintenance requirements

Implementation of fuel efficient solutions such as common rail, electronic fuel injection

High level of transmission efficiencies

Longer trains (up to 20 cars per trainset)

Improved controls and fault diagnostics

Flexibility in selection of engine and vehicle equipment

Features

Communication and Interfaces

Wire Train Bus (WTB) Multifunction Vehicle Bus (MVB) Control Area Network (CAN) interfaces for train communication network

Various auto and manual test modes, including load box, auto test for relays, manual test of inputs and outputs, self load test, meters test, excitation test, radiator fan tests and more ….

Electrical Control Cabinet

8

Propulsion Systems

Protections for low water level, low lube oil pressure, engine overspeed, locomotive overspeed, traction motor overspeed, engine overload, power and control ground, traction motor overheating and many more ……

Auto Test Modes

Alternator with Rectifier

Safety Features

Extensive Fault Diagnostics and Data analysis Over 250 types of faults with more than 220 types of parameters with fault data pack recording (1 second resolution) and easy download to laptop and USB pendrive

Traction Converter

Traction Motor


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1 Driver Console (with TFT LCD displays)

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Diesel Engine (CRDI, EFI, MFI)

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Passenger Information System

2 Vehicle Control Panel

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IGBT based Traction Converter

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Vehicle Remote Monitoring

3 Traction Alternator

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Auxiliary Converter

3 11

Dynamic Brake Grids

4 Rectier

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Traction Motors (AC)

New and Rebuild DMUs

Upgrades

Conversion

Propulsion system designed as an integral part of vehicle design to achieve desired ratings, performance and features

Retrofit solutions to upgrade PLC based car controllers to microprocessor based car controllers with improved vehicle availability and diagnostics

DC traction, high maintenance DMUs converted to IGBT based, low maintenance and high performance AC traction with advanced controls and enhanced power rating

1600 HP DMU

Basic unit: 1 DPC + 4 TC Train consist: 2/3/4 basic units or 10/15/20 cars respectively Max. speed: 120 kmph Initial acceleration 0.47 m/s2 System Integration Test (IEC 61377) Vehicle Integration Test (IEC 61133)

Passenger capacity (10 car consist): 900 seating, 1800 standing,14 lavatories Engine: 1600 HP, 1800 rpm, Cummins/Caterpillar Auxiliary alternator and compressor: directly coupled Alternator: 1.1 MW, 1800 rpm synchronous alternator with inbuilt exciter Traction converter: 2 units, 550 kW per unit, underframe mounted, IGBT based and forced air cooled, 32 bit DSP based traction computers, bogie control AC traction motors: 250 kW, 3000 rpm, self ventilated, axle hung, nose suspended

Controls: microprocessor based vehicle control computer, WTB train communication network Driver desk: complete with 10.4" TFT LCD display screen and various controls Battery bank: 24 V dc (engine starting) and 110 V dc (train auxiliary loads) Passenger information system (audio/visual) Efficiency at full load: traction alternator 95%, diode rectifier 99.5%, traction converter 98.5%, AC traction motor 93%, gear box 98% Overall power chain transmission efficiency approx. 85%

Propulsion Systems

9


Propulsion and Vehicle Control System for

Electric Locomotives Medha offers propulsion systems for New or Modernized Electric locomotives. Scope of supply may include complete integrated solutions (point of supply to point of drive) i.e. Pantograph, Vacuum Circuit Breaker, Main Transformer, IGBT Traction Converter(s), Auxiliary Converter, Vehicle Control and Fault Diagnostics system and AC Traction Motors or sub-set of above as per project requirement.

Highly redundant yet well integrated Vehicle Control Units

Fault data can be downloaded through pendrive or laptop or PC

Independent motor control improves wheel slip control (improved adhesion)

All parameters and faults from all sub-systems are provided on single display unit

Load changeover when any one auxiliary converter fails, redundant control of battery charger

Upgrade options provided for CCB, DPC, and HL

System flexibility

Ÿ Ÿ Ÿ Ÿ Ÿ Ÿ

Input Voltages (OHE) : 25 kV, 15 kV, 1500 V dc, 3000 V dc, Multi-voltage power supply Traction converter : IGBT switching devices Traction control : independent motor control or full bogie control Energy efficiency : electrical regenerative brakes Obsolescence management : availability of spare parts for full life span of locomotive Track Gauge : all gauge sizes

Features

§ § § § § § §

4.5 MW IGBT Converter, Stainless Steel body

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Propulsion Systems

Full regeneration capability Independent motor control with individual motor cutout Redundant CAN communications over Optic Fiber with Vehicle Control Unit Extensive fault diagnostics, protection to traction equipment and event recording GPS/GSM/CDMA based Remote Monitoring of Locomotives Increased reliability, reduced maintenance, modular design Improved wheel slip control and wheel-rail adhesion

Vehicle Control Unit

IGBT Module (water cooled)


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Pantograph

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Vehicle Control Cubicle(s)

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2

Vacuum Circuit Breakers

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Auxiliary Converter Cubicle(s)

10 Vehicle Remote Monitoring (VRMS)

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Traction Transformer

3 7

Hotel Load Converter (HEP)

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Line and Traction Converter(s)

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Traction Motors (AC)

Driver Console (with TFT LCD displays)

New and Rebuild Locomotives

Upgrades

Conversion

Integrated, complete propulsion system (AC traction)

Microprocessor based control and fault diagnostics implementation on DC traction locomotives

Silicon diode or thyristor rectifier based DC traction locomotive to AC transformer, IGBT traction converter and AC traction motor based locomotive

Existing GTO system to IGBT based traction system

Electric Locomotive (6000 HP) Propulsion System Modernization (Freight/Passenger) Retained Equipment – Pantograph, Vacuum Circuit Breaker, Transformer, Traction Motors etc. Traction Transformer - 1 Primary winding, 4 Secondary Traction windings (4 x 1449 kVA), 1 Auxiliary winding (334 kVA), 1 Head End Power winding (945 kVA) (Passenger only) Overhead Voltage: 25 kV, 50 Hz (16 kV to 31 kV) System upgrade includes – GTO converter to IGBT based Traction Converter, Microprocessor based Vehicle Control, IGBT based Auxiliary and Hotel Load Converter

Traction Converters - 2 units, Water cooled Each converter includes – 2 line converters (1φ full bridge IGBT rectifier), DC link (100 Hz resonant filter, DC link capacitor bank, over-voltage protection), 3 motor inverters (3φ full bridge IGBT inverter), 4.5 kV 1200 A IGBT module

Auxiliary Converter - 3 x 132 kVA, (415 V 3φ supply and 110 V dc battery charger), forced air cooled, 32-bit DSP based auxiliary computer, thyristors for input rectifier & IGBTs for inverter Hotel Load Converter - 2 units, 500 kVA 750 V 3φ, forced air cooled, IGBT rectifier & IGBT inverter (3.3 kV, 1500 A/1200 A) Vehicle Control Unit - redundant computers, CAN (over optic fiber) based locomotive communication network, WTB based interlocomotive communication, provision for radio based distributed power system Driver Interface - 10.4" TFT LCD display

Propulsion Systems

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Complete Traction System for

Electric Multiple Unit (EMUs) Medha works in association with EMU owners, operators and local coach builders to study, design and supply advanced traction system for new trainsets and also for revival of existing fleet. Solutions are designed to suit available input power supply, vehicle design and operational requirements. Revival of existing fleet can be done in shorter duration and at very economical costs (< 40% cost of new EMUs). Association also offers opportunities for building technological capacities and capabilities within the country of implementation.

Proven-in-use modules, packaged to meet space and weight restrictions

System operation for customized input from transformer winding (25 kV ac) or 1500 V dc

In-built redundancy and reliability for improved availability

Touch based HMI with centralized data information

 

Bogie level control

Under-frame or on-board mounted, light weight solutions

Mild Steel (MS), Stainless Steel (SS) or Aluminum (Al) enclosures with IP54 or better protections

Energy efficient solutions

Centralized system configuration, software programming and data downloading

Forced air cooled

Features

Communication and Interfaces Train-wide control network with redundant Multi-function Vehicle Bus (MVB) and Wired Train Bus (WTB) or redundant Ethernet Consist Network (ECN) and Ethernet Train backbone (ETB) between control systems of TCMS as per IEC 61375.

All power equipment are continuously diagnosed for its protection such as traction converters / auxiliary converter input over voltage, input over current, load side earth fault and short circuit protection.

Test Modes Centralized auto and manual test modes, including brake test, auto test for relays, brake chopper test, lights and fans test, manual test of inputs and outputs for entire train control equipment.

EMU Traction Converter

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Propulsion Systems

Auxiliary Control Cabinet

Safety Features

Electrical Control Cabinet

Extensive Fault Diagnostics Over 500 types of faults covering more than 700 parameters. Fault and event storage for 100 days. Centralized configuration and downloading of faults, events and status data.

Central Control Unit

Passenger Comfort Unit


Ethernet Switch

Ethernet Switch

Ethernet Switch PIS

PIS

Cab Rear Wall

Display 1

Display 1

Display 2

Driver Desk CCU1

Display 3

ECC Cabinet

CCU2

HMI Speed Recorder

Display 2 Display 3

Display 4

Display 4

WTB PIS

Driver's Desk

Display 1 PCU1

Driver's Desk

Display 2

Display 4

BCU

MVB CAN Traction Cabinet

Display 3

MCH

MCU

End Wall Panel

End Wall Panel PCU3

Auxiliary Cabinet

Shunting Desk

End Wall Panel

ACU

Freq. Generator

LTC

PCU2 MCH

TRAIN LINES

EP Unit

DTC

EP Unit

MC

EP Unit

TC

New and Rebuild Trainsets

Upgrades

Conversion

Integrated, complete propulsion system (AC traction)

Microprocessor based control and fault diagnostics implementation on DC traction trainsets

Silicon diode or thyristor rectifier based DC traction to AC transformer, IGBT traction converter and AC traction motor based trainsets

Existing GTO system to IGBT based traction system

Sub-urban EMU (Mumbai) Passenger capacity (12 car consist): 1168 seating, 4862 standing

Basic unit: 1 DTC +1 MC + 1 TC Train consist: 3/4/5/6 basic units or 9/12/15/18 cars respectively Max. speed: 120 kmph Average acceleration (0-40 kmph): 0.54 m/s2 Average deceleration : 0.84 m/s2

AC traction motors: 268 kW, 3000 rpm, axle hung, nose suspended

Controls: microprocessor based TCMS Line Converter: 1 unit per basic unit, with dual redundant MTB/ WTB 1800 V, 760 A per unit, onboard communication network mounted, IGBT based control and forced air cooled, 32 bit DSP based line Driver desk: driver control interface with computers 10.4” touch based TFT, switches/ push Traction converter: 1 unit per basic unit, buttons and master controller 1430 V, 468 A per unit, onboard Battery bank: 110 V dc , 90 AH per basic mounted, IGBT based control and unit forced air cooled, 32 bit DSP based Passenger information system: LED traction computers, bogie level control based in-coach display with audio Auxiliary Converters: 79.2 kVA, 415 V announcements 3φ 50 Hz, 18.6 kVA 3φ110 V ac 50 Hz, 10.9 kW 110 V dc

Propulsion Systems

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Complete Traction System for

Metro Train Medha works in association with Metro owners, operators and local coach builders to study, design and supply advanced traction system for building new metro trains and/ or for revival or renewal of existing fleet of old metro cars. Solutions are designed to suit available input power supply, vehicle design and operational requirements. Revival of existing fleet can be done in shorter duration and at very economical costs. Association also offers opportunities for building technological capacities and capabilities within the country of implementation.

Proven-in-use modules, packaged to meet space and weight restrictions

In-built redundancy and reliability for improved availability

Mild Steel (MS), Stainless Steel (SS) or Aluminum (Al) enclosures with IP54 or better protections.

System operation for customized input from transformer winding, third rail supply (600 to 750 V dc)

Bogie level control Under-frame or on-board mounted, light weight solutions. Energy efficient solutions

Touch based HMI with centralized data information Centralized system configuration, software programming and data downloading

Forced air cooled

Features

Communication and Interfaces Train-wide control network with redundant Multi-function Vehicle Bus (MVB) and Wired Train Bus (WTB) or redundant Ethernet Consist Network (ECN) and Ethernet Train backbone (ETB) between control systems of TCMS as per IEC 61375.

Centralized auto and manual test modes, including brake test, auto test for relays, brake chopper test, lights test, manual test of inputs and outputs for entire train control equipment.

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Propulsion Systems

Auxiliary Power Converter

Safety Features All power equipment are continuously diagnosed for its protection such as traction converters/ auxiliary converter input over voltage, input over current, load side earth fault and short circuit protection.

Test Modes

Traction Converter

Extensive Fault Diagnostics Over 500 types of faults covering more than 700 parameters. Fault and event storage for 100 days. Centralized configuration and downloading of faults, events and status data.

Electrical Control Cubicles

Driver Cab Rear Wall Panel


New and Rebuild Metros

Upgrades

Conversion

Integrated, complete propulsion system (AC traction)

Microprocessor based control and fault diagnostics implementation on DC traction trainsets

Silicon diode or thyristor rectifier based DC traction to IGBT based AC traction system and AC traction motors

GTO and thyristor system to IGBT based traction system

Kolkata Metro Passenger capacity (8 car consist): 400 seating, 3120 standing Traction converter: 2 units per basic unit, 435 kW per unit, underframe mounted, IGBT based control and forced air cooled, 32 bit DSP based traction computers, bogie level control Basic unit: 1 DTC +1 MC Auxiliary Converters: 162 kVA, 415 V Train consist: 2/3/4 basic units or 4/6/8 cars 3φ 50 Hz, 110 V dc respectively AC traction motors: 204 kW, 3000 rpm, Max. speed: 90 kmph fully suspended Average acceleration (0-40 kmph): 0.85 m/s2 Controls: microprocessor based TCMS 2 Average deceleration : 1.1 m/s with dual redundant ECN/ ETB

communication network Driver desk: driver control interface with 10.4” touch based TFT, switches/ push buttons and master controller Battery bank: 96 V dc , 300 AH per basic unit Passenger information system: 17.5” TFT based in-coach display with audio announcements

Propulsion Systems

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Customized Integrated Systems for Propulsion Control and Train Management of Metro, Monorail and Other types of Traction Vehicles

Medha works closely with customers, operators and car builders to develop low cost and localized trainsets to cater to specified needs of the customer. Localization of solutions will increase competence of our partners and will reduce dependency on train supplier for technological and after sales support. The solution will also help in building manufacturing capability within the country by utilizing competence of local industry for various components and sub-assemblies.

For new car body design, the propulsion system is designed as an integrated part of complete trainset

If an existing car body design is considered, the propulsion system is designed to suit the existing space availability, applicable weight restrictions and other user specific criteria

Important operational requirements such as latest technology solution, increased passenger carrying capacity, low life cycle cost, safety and system reliability etc. are taken into design consideration Integrated system includes a complete propulsion system from point of supply (Pantograph / Third Rail) to point of drive (Traction Motors) plus all equipment and controls in-between

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Propulsion Systems

Medhaâ&#x20AC;&#x2122;s scope will usually include IGBT based Traction System, TCMS, TFT LCD Driver Console, AC Traction Motors, Ethernet switches, TCN/IP gateways, CANopen and other network protocols for communication, Auxiliary Converter(s), HVAC controls, Passenger Infotainment System (audio/video), Surveillance system, Interface with customer specified sub-systems such as door controls, passenger counting system, fire safety system, etc. Partnerâ&#x20AC;&#x2122;s scope to include car body building, car interiors for complete train, underframe subassemblies such as bogie and wheels, other mechanical parts and mechanical integration of complete train


Rolling Stock Equipment Vehicle Control System

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Driver Guidance System

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Traction Converter

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Auxiliary Power Unit

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Traction Alternator

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Passenger Information System

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Traction Motors

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HVAC Controller

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Remote Monitoring

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Fuel Level Sensor

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Auxiliary Converters

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Vigilance Control Device

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Distributed Power Control

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Speed and Event Recorders

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End of Train Telemetry

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AC Motors with Inverter

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Hotel Load Converters

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Digital Air Flow Sensor

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TFT LCD Displays

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Surveillance System

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Driver Consoles

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Bogie Mounted Brake System

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Electronic Governor

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Dynamic Brake Resistors

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Common Rail Direct Injection

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Microprocessor based Vehicle Control and Fault Diagnostics System (for New or Retrofit of Locomotives and Traction Vehicles) Medha's MEP system is a 32 bit, high performance microprocessor based modular system that provides complete traction and propulsion control of the vehicle with continuous monitoring and extensive fault diagnostics. Major functions includes Engine control, Excitation control, Propulsion control, Wheel slip control, Auxiliary controls, Traction equipment protection, Fault Diagnostics, Data recording and Parameters display.

Very cost competitive

>20% increase in haulage capacity

Increased protection of traction equipment

Upto 45% increase in wheel-rail adhesion

>10% increase of traction motor life

User configurable parameters for easy adaptation to different types of vehicles

Extended comprehensive warranty, maintenance contract and other customer friendly after sales support packages

>15% reduction in vehicle assembly and commissioning time

Easily configurable to suit any make or model of locomotive (new or retrofit locomotives)

Features

Communication and Interfaces

Safety Features

Using CAN, ethernet or other channels for interface with Engine ECU unit, HEP, Surveillance system, ATP and other subsystems of the vehicle

Auto Test Modes Various auto and manual test modes, including load box, auto test for relays, manual test of inputs and outputs, self load test, meters test, excitation test, radiator fan tests and more ….

Engine Speed Sensor

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Rolling Stock Equipment

Protections for low water level, low lube oil pressure, engine overspeed, locomotive overspeed, traction motor overspeed, engine overload, power and control ground, traction motor overheating and many more

TM Speed Sensor

Extensive Fault Diagnostics and Data analysis Over 250 types of faults with over 220 types of parameters with fault data pack recording (1 second resolution) and easy download to laptop and USB pendrive

Voltage Sensor

Current Sensor


> 20% Increase in locomotive haulage capacity >15% Reduction in vehicle assembly time

On-board control panel, housing vehicle control computer and all electrical components

< 2yr Pay-back Period for retrofits

Display unit for control system Microprocessor based Vehicle Control System 32 bit, high performance microprocessor

 Large Number of Installations

to suit Vehicles of different make, model, type and HP rating, with nominal software and hardware variations

Since 2002, over 4000 systems have been installed on different make and types of locomotives and vehicles in various countries

Ÿ Any combination of traction

equipment make, model or type (AC or DC traction)

Easy Installation and Commissioning Available as ready to install control panel with all electrical components, reduces vehicle assembly and commissioning time by >15%

Ÿ For new locomotives and for

retrofit during repowering, rebuilding or major overhaul

Complete packaged solution Inclusive of, driver display | event recorder | driver alerter | speedometer | sensors | interconnecting cables | other components and sub-assemblies

Add-on Features

Compliance to International Standards

Vehicle remote monitoring Fuel saving solutions Distributed power control Fuel level sensors Auto creep control and many more....

IEC 60571 IEC 61373 (shock and vibrations) IEC 62498-1 (relative humidity) IEC 62236-3-2 (surge, EMC, ESD, EFT)

Pressure Sensor

Temperature Sensor

Analog Distribution Box

Speedometer is an inbuilt part of Medha's MEP system

Rolling Stock Equipment

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IGBT based Traction (Propulsion) Converters Medha supplies IGBT based traction (propulsion) converters ranging from 1.1 MW upto 4.5 MW and higher power ratings for installation on AC - AC traction vehicles including Locomotives, Diesel Multiple Units, DEMUs, EMUs and Metros. Medha's traction converters are designed to suit project requirement including building of new traction vehicles and retrofit or modernization or replacement of old (GTO or Thyristor) converters with IGBT traction converters.

Proven-in-use modules, packaged to meet space and weight restrictions

Mild Steel (MS), Stainless Steel (SS) or Aluminum (Al) enclosures with IP54 or better protections

Individual motor or bogie control

Under-frame or on-board mounted, light weight solutions

Customized traction chain solutions for new vehicles

Energy efficient solutions

In-built redundancy and reliability for improved availability

Forced air or liquid cooled

Customized for input from Alternator, Transformer winding, or Third Rail supply (600 to 750 V dc)

Upgrade Thyristor / GTO based traction to IGBT systems (retrofit solutions for locomotives, DMU and EMU)

Ÿ

Ÿ Ÿ

Ÿ Ÿ Ÿ

Propulsion system designed as an integrated system and integral to vehicle design Cost effective solutions to keep overall vehicle cost competitive Designed to suit vehicle performance requirements, weight limits and cooling requirements Low life cycle cost EMI/EMC Homologation Latest technology and best in class features

IGBT Module (water cooled)

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Rolling Stock Equipment

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IGBT Module (air cooled, heat pipe technology)

Gives new life (20 years or more) to old vehicles Resolves spare parts availability problems Overcomes technological obsolescence issues Economize by retaining healthy equipment Extended warranties and other after sales support schemes Customized solutions to suit existing vehicle design, space and weight criteria Improved reliability, availability and performance of old vehicles Proven-in-use modules & sub-system

IGBT Module (air cooled)

Traction Control Computer

5 C f


1.3 MW Traction converter for Electric Multiple Unit (EMU) 3 MW Traction Converter (forced air cooled) for 4500 HP Diesel Locomotive

5.1 MW Traction Converter (water cooled) for 6000 HP AC Electric

Proven Solutions Congurat ion

Power

Input

830 kW Traction Converter (forced air cooled) for a Metro Train

4500 HP Diesel Loco (Retrot Upgrade)

5500 HP Diesel Loco (Retrot Upgrade)

(Freight/Passenger)

(Freight/Passenger)

1 MW Traction Converter (forced air cooled) for 1600 HP Diesel Multiple Unit (DMU)

1600 HP Diesel 6000 HP Electric 1.3 MW Electric Multiple Unit Multiple Unit Locomotive (Freight/Passenger) (DMU) (EMU)

2 Cabinets (Two 1 Cabinet, Six 1 Cabinet, Six 2 Cabinets (One Line Converters, independent independent Traction Inverter Three Inverters Traction Inverters Traction Inverters each) each) 1275 kW X 4 Line Converters, 850 kW x 6 Inverters (5100 kW)

520 kW X 6 Inverters (3100 kW)

650 kW X 6 Inverters (3900 kW)

550 kW X 2 Inverters (1100 kW)

600 – 2600 V dc Link Traction Alternator (Engine driven)

600 – 2700 V dc Link Traction Alternator (Engine driven)

838V – 1574 V 600 – 1800 V dc ac (1φ) from Link Traction Traction Alternator Transformer (Engine driven) (4 secondaries)

1 Cabinet, Two Line Converters and Two Inverters

Metro Train

2200 HP Diesel Loco (Retrot) (Freight/Passenger)

2 Cabinet(One 1 Cabinet, Six Traction Inverter independent Each) Traction Inverters

650 kW X 2 Line 415 kW X 2 Converters, Inverters 625 kW x 2 (830 kW) Inverters (1300 kW)

275 kW * 6 Inverters (1650 kW)

630 V – 1142 V ac (1φ) from Traction Transformer (2 secondaries)

600-1800 V dc Link Traction Alternator (Engine driven)

500-900 V dc from 3rd Rail Supply

Up to 1375 V ac Up to 1375 V ac Up to 615 V ac Up to 2185 V ac Up to 2030 V ac Up to 2090 V ac (3φ), 550 kW (for (3φ), 625 kW (for (3φ), 415 kW (3φ), 850 kW (3φ), 520 kW (3φ), 650 kW two Motors) two motors)

Upto 1375 V ac (3φ), 275 kW

540 kN (Freight) 560 kN (Freight) / 462 kN / 462 kN 160 kN (Passenger) (Passenger)

520 kN (Freight) / 320 kN 135 kN (Passenger)

140 kN

387 kN

6.5 kV, 600 A

4.5 kV, 900 A

3.3 kV, 1200 A

4.5 kV, 1200 A

3.3 kV, 1200 A

1.7 kV, 1800 A

3.3 kV ,1200 A

Cooling

Independent Forced Air cooling for each Inverter; heat pipe heat sink

Forced Air cooling

Independent Forced Air cooling for each Inverter

Water cooled

Forced Air Cooling

Independent Forced Air Water Cooled cooling for each Inverter

Type of Control

Independent Motor control

Independent Motor control

Bogie Control (One Inverter for Independent two Traction Motor control Motors)

Bogie Control (One Inverter for two Traction Motors)

Bogie Control (one Traction Independent Inverter for two Motor Control Traction Motors)

Mild Steel; Onboard

Mild Steel; Onboard

Mild Steel; Under Stainless Steel; Frame On-board

Aluminium Onboard

SS 409

Output

Starting TE IGBT

Enclosure Mounting

Mild Steel

Rolling Stock Equipment

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Traction Alternators (Joint Venture with Traktionssysteme Austria GmbH, Austria)

Medha offers traction alternators for different makes and models of diesel locomotives and diesel multiple units. For new vehicles, the alternator is designed as an integral part of vehicle propulsion system whereas for rebuilding or re-powering projects, offered alternators are unit replacement to old alternator.

Class 220 insulation is achieved by adhering to stringent material requirements and very effective impregnation system. Traction alternators are designed to withstand harsh railway conditions when installed on locomotives and DMUs and to suit any type of traction system.

Recently designed 1800 rpm alternator, with in-built excitation generator, for 1600 HP DMU

Offered range of alternators includes

Rating of upto 5000 kVA, customers can choose

Other criteria of selection may include

ì Medium speed (~1000 rpm) machines coupled to engine makes such as EMD, GE, ALCo etc.

ì Alternator directly coupled to engine crank shaft and meeting electrical requirements for both propulsion and auxiliaries

ì slip-ring type or double bearing type;

ì High speed (~1800 rpm) machines coupled to engine makes such as Caterpillar, Cummins, MTU, MAN etc.

CMM Machine

22

Rolling Stock Equipment

ì Alternately with inbuilt companion alternator for auxiliary requirements

VPI Plant

ì top-mounted rectifier; ì inbuilt hotel load winding or companion alternator; ì inbuilt excitation generator;

Induction Brazing Machine

Dynamic Balancing Machine

V


Traction Motors (Joint Venture with Traktionssysteme Austria GmbH, Austria)

Medha, in association with Traktionssysteme, Austria (which has >40 years of experience in design and manufacture AC traction motors in Austria) offers range of traction motors for diesel and electric locomotives, DMUs, EMUs, Metros and other types of traction vehicles. Recently designed motors includes 268 kW motor for 1600 HP DMU, 268 kW motor for 1.3 MW EMU, and 420 kW motor for 4500 HP diesel locomotive, all meeting IEC 60349 standard.

AC traction motor for 1.3 MW EMU

AC traction motor for 1600 HP DEMU

3Ď&#x2020; AC asynchronous traction motor for 4500 HP diesel locomotive

Design flexibility

Customer's benefits

Motors are designed to suit different types of cooling (self ventilated, forced air cooled, liquid cooled), bogie design (axle hung nose suspended, semi-suspended, fully-suspended) and track gauge (meter, cape, standard, wide gauge). w Special designs for flood proofing requirements w Complete gear drive is supplied as an integrated solution

w

w

Vacuum Oven (Pre-heating)

Coil Looping Machine

w

w w w w

Price competitiveness with manufacturing facility in India Large database of designs from projects all over the world; can be easily customized for any new requirement Class 220 insulation allows compact motors Long operating life and low life cycle cost Any motor rating from 40 kW to 1600 kW Option to have single manufacturer taking responsibility for all propulsion equipment including converter, alternator, motor and controls

Coil Spreading Machine

Industrial Washing Machine

Rolling Stock Equipment

23


Remote Monitoring of Traction Vehicles in Real-time (VRMS – Vehicle Remote Monitoring System |GPS/GSM/CDMA based) Medha's VRMS system is a one-stop-solution to meet all the below requirements ü ü ü ü ü ü ü ü

Exact location and status (idling, working with load, etc.) of the vehicle Health status of all electrical/mechanical equipment Immediate information of any critical fault or failure Fuel availability and consumption related information Communication with the vehicle driver incase of urgency Reduced maintenance time and cost Increased availability of vehicle for increased revenue Performance data for trends and analysis

GPS Satellite GSM / CDMA

Server

Antenna for GSM/CDMA/GPS (IP65 Protection)

Remote Monitoring Unit (using GSM/CDMA for communication and GPS for location tracking)

24

Rolling Stock Equipment

Access from any where in the world through internet


Advantages w

> 30% reduction in maintenance time (prior information of failures and faults)

w

> 10% reduction in maintenance cost based on preparedness for repair

w

Online monitoring of vehicle and parameters

w

Fuel consumption and vehicle usage monitoring

w

Extensive data analysis tools in application software

w

Automatic alerts of critical faults over SMS and email

w

Extendable to provide direct voice communication with vehicle driver

Notch wise run time statistics

w

Time trend visualization of engine parameters

User-settable features to receive filtered and relevant information in customized formats

Operational features ì

Using GPS (for location) and GSM/CDMA (for communication), remote monitoring unit will send vehicle status details as available with vehicle control unit (or TCMS) to main internet server

ì

User can access their fleet status details over internet by simply logging on to the website. Using their personalized username and password, users get access to historic and current data of the vehicle

ì

Security of vehicle information is ensured through multilevel access rights and password protections

ì

For pre-defined types of faults or conditions, the user can receive alerts over SMS and email

APU usage summary

Engine health parameters

Configuration for user defined alerts

Life time data of locomotive

Pareto chart for notch wise data

Exporting user defined report filters

Rolling Stock Equipment

25


Auxiliary Converters (2.5 to 300 kVA)

There are no standard auxiliary converters that can fit different applications. Requirement of every auxiliary converter is unique and accordingly designed. Medha has designed different types of auxiliary converters in the range of 2.5 kVA to 300 kVA and for various types of applications such as air-conditioned passenger coaches, electrical multiple units and metro cars.

Proven-in-use modules, packaged to meet space and weight restrictions

Mild Steel (MS), Stainless Steel (SS) or Aluminum (Al) enclosures with IP54 or better protections

Under-frame or on-board mounted, light weight solutions

Flexibility to suit customer needs Ÿ Ÿ

Ÿ Ÿ Ÿ

Ÿ Ÿ Ÿ

§

§ § § § § § §

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Rolling Stock Equipment

Energy efficient solutions

In-built redundancy and reliability for improved availability

Natural, forced air or liquid cooled

Customized for input from Alternator, Transformer winding or Third Rail supply (600 to 750 V dc)

Sample architecture

Input : AC or DC or both Input source : Vehicle transformer, Alternator, Traction Converter DC link, Battery Bank, Third Rail or others Output : AC or DC or both Cooling : Natural/Forced air convection or Liquid cooling Auxiliary loads : Blower, Pump, Compressor, Lighting, Fan, HVAC, Heating, Battery charging, Radiator fan, other vehicle specific sub-systems Converter mounting : Underframe, Onboard, Roof or as Distributed modules Weight : as per customer requirement Body : Mild Steel, Aluminum, Stainless Steel

180 kVA

50 kVA

Input power is processed through a converter to provide a stable and controlled DC bus voltage. Output may be another DC stage (with or without galvanic isolation) or an AC inverter with regulated output. IGBT switching devices used along with Thyristors, power diodes and MOSFETs. Polypropylene (dry) capacitors used for improved life and ripple handling capabilities. Magnetics (transformers and inductors) used for isolation and harmonic filtering. Sensors (voltage, current, temperature) used for control, monitoring and protection purposes. Optic fiber communication for electrical noise immunity. DSPs or Microcontrollers used for overall controls. Type tested to latest IEC standards such as IEC 61287, IEC 60571, and IEC 61373.

25 kVA

2.5 kVA


EMU Auxiliary Converter 125 kVA

Electric Locomotive Auxiliary Converter Unit 2 X 132 kVA

Auxiliary Converter for Air Conditioned Coaches 25 kVA

Electric Locomotive Auxiliary Converter Unit 132 kVA

Metro Car Inverter 160 kVA

Some of the Implemented Solutions

Electric Locomotive

Electric Locomotive

Rating

Input

Output

300 kVA (132 kVA X3)

660 V – 1240 V ac (1φ) from 415 V ac (3φ), 132 kVA ; 110 V dc, Transformer 12 kW, Battery Charger Auxiliary Winding

180 kVA

570 - 1140 V ac (1φ) from Transformer Auxiliary Winding

415 V ac (3φ), 162 kVA, TM cooling, Compressor 110 V dc, 18 kW for Battery charger

Cooling

Other Details

IP54 cabinet (Inbuilt redundancy, Forced Air and load cooling changeovers between three inverters) Forced Air IP54 cabinet cooling

415 V ac (3φ), 87 kVA for propulsion, cooling, compressor, coach ventilation Electric Multiple Unit (EMU)

125 kVA

1800 V dc from dc Link of Traction Converter

110 V ac (1φ), 21 kVA for lighting & fans Forced Air

cooling

IP54 cabinet

110 V dc, 14.4 kW for all dc loads 110 V dc, 2.6 kW, Battery charger 415 V ac 3φ, 132 kVA for air conditioning

IP65 cabinet, underframe mounted

Metro Cars

160 kVA

500 - 1000 V dc from third tail collector

Metro Cars

50 kW

500 V - 1000 V dc from Third Rail Collector

415 V (3φ), 25 kVA for Air conditioning 110 V dc, 25 kW, Battery Charger

Natural Air IP65 cabinet, Convection underframe mounted cooled

5 kW

500 V - 1000 V dc from Third Rail Collector

6-12 V dc, 5 kW, Field Injection of TM for braking

Natural Air IP65 cabinet, Convection underframe cooled mounted

Passenger Coaches

25 kVA

110 V dc from Natural Air IP65 cabinet, battery in parallel 415 V ac (3φ), 25 kVA for Air conditioning Convection underframe to axle driven cooled mounted Alternator

Passenger Coaches

2.5 kVA and 5 kVA

Metro Cars

110 V dc from battery

Forced air

110 V dc 25 kW DC outputs and battery cooling charger

230 V ac (1φ), 2.5 kVA and 5 kVA for Coach lighting and charging plugs

Natural Air IP65 cabinet, Convection underframe mounted cooled

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Distributed Power Control (DPC) (using wireless data radio) Radio Link

Radio Link

ELECTRICAL CONTROL CABINET - ECC #2 TYPE

SL. NO.

MCP 461

1001

LOCO TYPE

ELECTRICAL CONTROL CABINET - ECC #2

WDG4 / WDP4

MFG.

TYPE

08 / 07

SL. NO.

MEDHA SERVO DRIVES PVT. LTD.,

MCP 461

1001

LOCO TYPE

ELECTRICAL CONTROL CABINET - ECC #2

WDG4 / WDP4

MFG.

TYPE

08 / 07

SL. NO.

MEDHA SERVO DRIVES PVT. LTD.,

P-4/5B, IDA, NACHARAM, HYDERABAD - 500 076.

MCP 461

1001

LOCO TYPE

WDG4 / WDP4

MFG.

08 / 07

MEDHA SERVO DRIVES PVT. LTD.,

P-4/5B, IDA, NACHARAM, HYDERABAD - 500 076.

DLW ORDER NO.: 060580540 . 06284993 DATE : 24.05.2006

P-4/5B, IDA, NACHARAM, HYDERABAD - 500 076.

DLW ORDER NO.: 060580540 . 06284993 DATE : 24.05.2006

DLW ORDER NO.: 060580540 . 06284993 DATE : 24.05.2006

Upto 5 locomotives can be synchronized in a train formation Four locomotives distributed in upto four locations along the train and following the power and brake commands from the lead locomotive More rapid deceleration is possible Reduced lateral forces and friction (reduced wheel and track wear) Reduced impact of heavy trains on tracks Overcomes difficulties related to excessive in-train slack action, deterioration of air brake signal propagation, and stress on infrastructure and equipment Fail safe modes incase of radio communication failure

Operational and fault data from all locomotives made available on TFT LCD driver display for better control and maneuverability of formation Brake pipe continuity test to ensure integrity of train Brake pipe based operation incase of radio communication failure

End-of-Train-Telemetry (EOTT) (using wireless radio) Medha's EOTT system includes End-of-Train (EOT) device mounted on last vehicle and Cab Display Unit (CDU) mounted in driver cabin. Communication between EOT and CDU is through wireless radio signal.

Increased revenue (pay-load car instead of caboose or guard van)

Improved safety (train integrity function for early detection of train parting)

Reduced braking distance and reduced rail and wheel wear (simultaneous application of service brake from locomotive and End of Train device) EOT (End of Train) device

CDU (Cab Display Unit) CDU is interfaced to locomotive brake system (pressure sensors) and wireless data radio for communication with EOT

EOT is mounted on coupler of last vehicle and connected to train brake pipe. It monitors brake pipe pressure at end of train and reports the same to CDU. Upon command from CDU, EOT will also apply brakes.

Radio Link Complete interchangeability of EOT and CDU devices with only journey specific radio frequency linking between EOT and CDU ELECTRICAL CONTROL CABINET - ECC #2 TYPE

SL. NO.

MCP 461

1001

LOCO TYPE

WDG4 / WDP4

MFG.

08 / 07

MEDHA SERVO DRIVES PVT. LTD., P-4/5B, IDA, NACHARAM, HYDERABAD - 500 076.

DLW ORDER NO.: 060580540 . 06284993 DATE : 24.05.2006

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Rolling Stock Equipment

EOT Device (with rechargeable battery) mounted on last vehicle


Head End Power (HEP) (Hotel Load Converter or Auxiliary Train Supply) Medha offers HEP units from 300 kVA-500 kVA and higher (1000 kVA â&#x20AC;&#x201C; 2x500 kVA), utilizing capacities of alternator / transformer to meet auxiliary power requirements such as lighting, fans, HVAC, heating, battery charging etc. of complete train.

500 kVA converter, on-board mounted, forced convection cooled

Single, dual or multi voltage options Energy efficient design In-built redundancy and safety features Underframe or on-board mounted

500 kVA converter, underframe mounted, forced convection cooled

HEPs are IGBT based converters, using sine filters at inverter output to minimize harmonic distortions. Protections for output overload, short circuit and power ground are provided. The converters are designed to suit wide range of inputs.

Natural air cooled, forced air cooled or liquid cooled Modular design for ease of maintenance Compact, reliable and robust design to withstand railway conditions Compliance to international standards: IEC 60571, IEC 61287, IEC 61373 Flexibility to have integrated HEP units with in-built battery charger, HEP unit integrated with traction converter, or other customer specified requirements

Recently implemented solutions 6000 HP electric locomotive, 1000 kVA (500 kVA X 2) HEP units, 525-900 V dc input, 3.3 kV IGBT, forced air cooled, IP54 protection, on-board mounting 4500 HP diesel locomotive, 500 kVA HEP unit, 1200-2600 V dc input, 6.5 kV and 2.5 kV IGBTs, forced air cooled, IP65 protection, underframe mounting

attery) icle

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TFT LCD Driver Displays Medha supplies TFT LCD displays, an efficient man-machine interface to provide better visualization of vehicle data. Multiple programmable screens are used to provide practically unlimited amount of information to driver. 10.4" multi-functional TFT LCD displays, available with Vandal proof keys or Touch Screen option, are mounted in driver console (driver desk) of Locomotives, EMUs, DEMUs, Metro cars or other propulsion vehicles.

Reduced driver desk clutter with removal of individual dials and gauges

Customized display screens as per customer requirements

Installation Features

Multi-lingual display for different languages

Brightness adjustment (automatic or manually adjustable)

Low power consumption

Superior Technical Features

Parameters can be displayed as icons, dials, graphs, text, etc., completely customizable

ì Single Board Computer (SBC) with Intel, AMD or

Interface with vehicle control system provides all operating parameters and faults related information to be displayed

ì Windows XP Embedded OS (other operating

ì

Maintenance related display screens

ì In-built power supply with galvanic isolation

ì

Additional sub-systems can be interfaced (using RS232, RS485, ethernet, etc.) such as redundant Vehicle Computer, End-of-TrainTelemetry, Distributed Power Control and other vehicle specific systems

ì ì

Trip data reset screen

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Rolling Stock Equipment

Motoring parameters screen

ARM processors systems can be supported)

ì Active matrix color TFT LCD display (operates on vehicle voltage)

ì 2 GB flash memory (expandable up to 8 GB) ì Rugged construction to withstand extreme environmental conditions and wide temperature ranges

TE meter test screen

Self test of control system


Driver Desk Consoles

Driver console with TFT screens for 4500 HP, dual cab, diesel locomotive

Driver desk for 3000 HP, cape gauge, out-of- the-frame rebuild locomotive

Medha's supplies drive consoles for applications such as - 1250 HP to 4500 HP new locomotives, 2200 HP - 3100 HP out-ofthe-frame rebuild locomotives, Diesel Multiple Units, Electrical Multiple Units and Metro Cars.

Features §

Ergonomically optimized layout

§

Improved functional segregation

§

TFT LCD display

§

Harmonized Driver Machine interface

These consoles are supplied in ready to install condition with TFT LCD displays, master controller, brake controller, electrical switches, gauges, lamp indications and other required components and sub-assemblies.

§

Standardized displays, independent of application

§

Attractive exterior designs

§

Standardized solutions

§

Cost competitive

Material of construction maybe MS (mild steel), FRP (fibre reinforced plastic) or polyester/ phenolic resins to comply with fire standards for flammability, smoke and toxicity.

§

Optimum utilization of cabin space

§

Human safety and comfort considerations

§

Scalable for installation of additional sub-systems in future

TFT LCD based driver desk for 2600 HP, dual cab, rebuild locomotive

Rolling Stock Equipment

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Electronic Governor (for diesel-electric locomotives)

>3500 units operational < 2 year ROI

Closed loop PID control for high precession

Control Unit with control cards

LOP (Lube oil) FOP (Fuel oil) BAP (Boost/Turbo air)

Actuator unit, mounted on engine block (in place of mechanical governor) Linear output of actuator connected to fuel linkage (GE, ALCo type engines) Engine Block

Customerâ&#x20AC;&#x2122;s beneď&#x20AC; ts w Lower initial investment w Low maintenance cost w Increased battery life of locomotive w No hunting of engine (accurate, precise, repeatable controls) w Extensive fault diagnostics features w No consumables (such as oil, water etc.) w Increased reliability of locomotive w Extended warranty and unit exchange options w No black smoke (fuel limited in case of low BAP)

Features w Standardized models to suit different engine makes and models w Light weight Actuator <22 kg w Control Unit available with inbuilt display or separate display unit to save driver cabin space w Dry run test for checking fuel rack movement w Driver display information includes Notch, Engine speed, Fuel Rack position, LOP, FOP, BAP, LWP and LCP w In-built engine safety features (low lube oil shutdown, over speed shutdown, low water level protection etc.) w Maintenance free solution to replace, high maintenance mechanical type engine governors

Control Unit houses the control modules. The unit is mounted in the driver cabin. It maintains engine speed as per commanded notch position by controlling the fuel rack position. In-built protection features for fault conditions includes over-speed, low lube oil pressure, actuator failure, etc. protections. VFD Display provides engine parameters and fault messages. Load control signal is provided to interface with locomotive excitation system.

Control Unit with integrated display unit

Actuator Unit mounted on engine block, controls the fuel rack linkage through a stepper motor drive. Minimal moving parts and no lubricating consumables make it a low maintenance system. Rotary output of actuator connected to fuel linkage (EMD type engines)

32

Rolling Stock Equipment


Common Rail Direct Injection (for diesel locomotives) (Joint Venture with Ganser CRS, Switzerland) Fuel saving: 4-5% for old engines

ROI <3 years

Medha is the first company in India to offer CRDI as retrofit for old engines on locomotives. Fuel injectors are designed to suit existing engineâ&#x20AC;&#x2122;s cylinder head for retrofit and as an integral design for new engines. Design flexibility takes into consideration the number of cylinders, cylinder arrangement, engine speed and power, injection pressure etc. Configurable parameters for adaptation to different engine models.

Engine Control Unit (ECU) with integrated display, keyboard, buzzer and acknowledgment switch

High Pressure Pump

Fuel Injectors

Reduction in harmful emissions 20-30% for old engines

Operational Features

Supply includes,

w

Reduced cranking time

w

Injectors

w

Low idle speed control

w

Pumps

w

Cylinder skipping at low speeds

w

ECU (Engine Control Unit)

w

Individual injector isolation and reduced power operation features

w

Sensors and Interconnecting Cables

w

w

Speed ramp for faster acceleration and deceleration

Interface development with vehicle control system

w

Fuel, coolant and ambient temperature corrections

w

Fault logging and fault diagnostics

w

Low lube oil, engine over-speed, engine fault based engine shut-down, hot engine and lube oil temperature based protections System and components designed to withstand harsh temperature and environmental conditions for railway application of engines

BSFC g/hp.hr

w

BSFC Comparision CRDI vs Mechanical 300

Mechanical CRDI

250 200 150 100

IDLE

1

2

3

4

5

6

7

8

Notch

Rolling Stock Equipment

33


Guidance for Optimized Loco Driving (GOLD) (Fuel Savings and Emission Reduction) Medha's GOLD is a driver advisory system which helps the loco-pilot to complete the trip with lesser standard deviation from target completion time and with lesser fuel consumption as compared to similar trips on same route without any advisory assistance. LCD display provides realtime optimized speed profile vs current speed profile, advised vs current notch (or braking power) and other track and trip related data to help the driver complete the trip in most fuel efficient manner.

More than 10% fuel saving More than 10% reduction in harmful emissions Increased adherence to journey schedule timings

Trip optimization inputs include gradients, curvatures, applicable speed limits, signal post locations, stations and scheduled stoppages, train resistance coefficients, trailing load, train length, route kilometer, target journey time, formation type etc.

Driving comfort with reduced variation in journey times Works on principle that pareto front of different driving strategies for a journey plotted on Journey Time vs Fuel Consumed follows an inverse relationship. Any journey can be completed in different time intervals and there will always be one optimal driving strategy which consumes least energy (fuel) for given journey time. Trip completion time is used as basis to generate fuel optimized speed profiles. Depending on the status of completed trip and other completed events, the optimal speed profile changes with trip progress. The original speed profile is dynamically updated to generate optimized advisory speed profile for the remaining trip. Driver completes the trip with lesser standard deviation from target completion time and with lesser fuel consumption, as compared to similar trips on same route without any advisory assistance. Track data is downloaded automatically from internet server at the start of journey and driving performance

Optimum profile with track details (Gradients and speed limit)

34

Rolling Stock Equipment

Driver advisory display mounted on locomotive driver desk

statistics are uploaded for reporting at the end of journey.

Optimum vs Realtime driving profile


Auto Engine Shut-down (AES) and Auxiliary Power Unit (APU) (Fuel Savings and Emission Reduction) Auto Engine Shut-down provides fuel savings from unwanted loco idling. It monitors the parameters, but does not maintain them to required levels. The savings are substantially enhanced with addition of Medha's Auxiliary Power Unit. APU is a self-contained system with its own small diesel engine coupled to low capacity compressor and alternator to maintain main reservoir pressure, charge battery, operate driver cabin HVAC system and other small loads as per customer requirement.

More than $ 20,250 per locomotive per year fuel savings with APU

APU unit complete with enclosure for indoor or outdoor mounting on the locomotive

More than 25% reduction in idling emissions

Enclosures are customized to suit locomotive type and space availability

Increased useful life of locomotive engine

Can be installed on new locomotives or retrofitted on old locomotives

Two stage ‘W’ type, splash lubricated and forced air cooled compressor used in APU

Auto Engine Shut-down (AES) Locomotive Idling details (in hours) Before

Idle - 4826:12:22 Notch 2 - 307:18:04 Notch 4 - 233:59:01 Notch 6 - 227:38:34 Notch 8 - 305:23:37

Notch 1 - 520:44:12 Notch 3 - 274:24:35 Notch 5 - 211:33:57 Notch 7 - 350:40:40 Coasting - 1111:40:17

After installation of Medha’s AES/APU system

Idle - 1426:12:22 Notch 2 - 510:18:04 Notch 4 - 253:59:01 Notch 6 - 387:38:34 Notch 8 - 385:23:37

Notch 1 - 905:44:12 Notch 3 - 305:24:35 Notch 5 - 301:33:57 Notch 7 - 380:40:40 Coasting - 1311:40:17

Main engine is shut-down after preset time of locomotive idling. Defined parameters such as battery voltage, brake pressure, lube oil temperature etc. are continuously monitored and incase any parameter is outside the permissible limit, main engine is restarted to bring the parameters back to required levels. The main engine shut-down cycle is continuously repeated to save on fuel consumption due to unwanted loco idling. Timings and parameter values are user-settable to suit locomotive operating conditions.

Rolling Stock Equipment

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Passenger Information System (PA/PIS) Medha supplies PA/PIS system and GPS based LED display boards for trains and coaches. Audio system is designed so that the passengers receive relevant information at appropriate times. LED displays are customized using different LED sizes, spacing between LEDs, colors (multi/mono), matrix size, mounting requirements etc. LCD display boards are also available as per customers requirements and specifications.

GPS based LED boards for coaches

PA/PIS system for DMUs, EMUs and trainsets

Special application displays mounted inside and outside the passenger coaches with inbuilt GPS receiver, these displays work independently without requiring any train wide communication network or interconnection between coaches.

Integrated and interactive audio-visual system

All displays of a train can be simultaneously configured with radio frequency based remote control unit. Inside coach displays give audio-visual intimation of distance to go and estimated time to next stop. Outside displays provide car and train related information. Real time GPS information, pre-stored railway network map data and pre-stored messages are used to provide audio-visual messages for passengers.

Scalable system to suit train configuration Driver HMI interfaced PSU controller is linked to driver mic, cab loudspeakers, train radio, location referencing equipment and to the train wide communication network (Ethernet, CAN, RS-485, etc.) PCC (PIS car controller) receives information from PSU to generate audio-visual messages Ambient noise monitor provides for automatic audio volume control of announcements Passenger-Driver emergency communication units are provided Pre-recorded and direct announcements from driver cab to passengers Communication between - driver and guard, driver and passenger, operational control center and driver, operational control center and passengers

PA/PIS system with audio visual announcements GPS based LED boards (stand alone type)

36

Rolling Stock Equipment


HVAC Controller Medha supplies HVAC controller unit for Metros for countries like USA which demands car inside temperature to be maintained within a narrow temperature range under conditions where the ambient temperature ranges from sub-zero levels to hot wether conditions. An advanced close-loop temperature control algorithm is used to achieve this temperature uniformity for passenger comfort. The unit controls the switching ON/OFF of air-conditioning and heating unit within the cabin. Temperature sensing within the cabin is distributed to compensate for localized fluctuation of temperature due to frequent opening of doors. Ambient temperature variation as per geographical location defines the capacity and rating of HVAC unit.

Designed as integral part of HVAC control panel

Configurable set points through USB interface

Sized to match available space and location in case of replacement projects or retrofit solutions

Events and errors are logged with data along with time stamp

Compact unit for easy installation within the HVAC panel on passenger coach

Optional wired remote indicator for monitoring

Modular construction for easy service, maintenance and scalability Flexible serial bus communication interfaces for seamless integration with train network Available with localized operational control and/ or with remote control unit for remote operation

Built-in diagnostics and test modes for easy testing and troubleshooting Quick response time for compressors and heaters safety Rugged construction to withstand harsh railway environment

The controller unit is packaged to fit into the available space in case of retrofit.

Remote Indicator Module

HVAC Controller Unit with status display LEDs

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Fuel Level Sensor Fuel Level Sensor is mounted on fuel tank of diesel locomotives and is interfaced to the control system which hosts the algorithms to calculate the fuel level and consumption

Ultrasonic frequency based, Fuel Level Sensor

Fuel consumption monitoring with Medha’s Remote Monitoring System

Ultrasonic frequency based non-contact sensor

Real-time accurate information of fuel position

Fuel level and consumption related information can also be viewed online over internet using Medha's Remote Monitoring system

Trip based fuel consumption calculations

Safety against fuel pilferage or theft

Calibration procedure to accommodate for different size, shape and volume of fuel tanks

Correction of errors due to gradient, curvature, tank shape lead to high accuracy

Intelligent algorithm for compensation for errors due to gradient, curvature, vibration

Up to 20 litres accuracy in 5000+ liter fuel tank

Vigilance Control Device (Driver Alerter) Medha's VCD is a multi-resetting type, standalone safety device which detects the driver’s alertness through normal driving actions and provide audio-visual alarm, followed by automatic brake application incase the driver is incapacitated or is unable to perform normal activities.

Driver Alerter Unit for Electric Locomotives

Driver Alerter Unit for Diesel Locomotives

38

Microcontroller based system

Can interface with vehicle control system

Electro-mechanical, penalty brake application counter

Sealed isolation switch to bypass Alerter

Rolling Stock Equipment

Brake application solenoid

Pre-defined set of driver actions considered are § changes in master handle position (powering or dynamic braking) § pneumatic brake application § operating of locomotive horn § sanding § pressing of alerter reset button and § other actions as per customer specifications


Speed Recorder/ Event Recorder (Digital Event Recorder) Medha's Speed-Time-Distance Recorders and Event Recorders are available in different models based on type of propulsion vehicle. A digital system, it provides online speed indication, records travelled distance and other parameters. Energy consumption monitoring option is available for Electric locomotives and EMUs. Event Recorders are supplied complete with speed sensor (axle or traction motor mounted), voltage and current sensors (for energy consumption recording in electric vehicles), junction box, interconnecting cables, non-volatile memory card and PC application software. Very accurate, microprocessor based system

Speed sensor with inbuilt redundancy and automatic change-over

High reliability and maintenance free operation Non-volatile flash memory

Digital display of speed value in case of analog display failure

Audio-Visual over-speed alarm, user-settable threshold

User friendly application software for settings, data download and analysis

Self-Diagnostic feature to check system health

Indicator units are provided for second cab in dual cab vehicles. It takes input from recorder unit. The recorder unit has memory freeze feature to freeze data recording for further analysis, incase of eventualities.

Speed-Time-Distance and Event recorders and indicator units with speed, voltage, current sensors and junction box

System Details

Recording Modes

Accuracy of recording : +/- 0.8%

Time based : data recorded at 20 sec intervals, user-settable between 1-120 seconds

Speed indication accuracy: +/- 0.8% Odometer in km: 8 digit, accuracy +/-1 km Wheel diameter adjustment: in 1 mm steps Optically isolated, reverse polarity and surge protected inputs and outputs Communication: RS485 for indicator unit, RS232 for PC, USB for data download, others as per customer requirement

Distance based : distance recorded at every 400 metres travel, user-settable between 20 â&#x20AC;&#x201C; 4000 metres Speed based : data recorded whenever speed changes by +/- 5 km/h, user-settable between 1â&#x20AC;&#x201C; 10 km/h Event based recording : a combination of inputs recorded as events

Data Entry: keyboard on recorder unit Recorder unit weight : 4.5 kg

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39


Small AC Motors (with in-built Inverter) Diesel locomotives use DC auxiliary power supply and small DC motors for various applications. These DC motors are failure prone and at times can even lead to failure of the locomotive itself. To overcome this, Medha offers AC motors (with inbuilt inverter) to directly replace DC motors on the diesel locomotives.

Crank case exhaust motor (0.5 HP) (motor+inverter+blower)

Fuel pump motor (1.5 HP) (motor+inverter+two pumps)

Wide input voltage range (from auxiliary generator or vehicle battery): 50-90 V dc

Cyclonic filter dust exhaust motor (0.87 HP) (motor+inverter+blower)

>80% combined efficiency Rugged construction

Operates even under very low voltage situations during engine cranking

Class-H insulation, IP65/ IP54 protection

Digital Air Flow Sensor Medha's digital air flow sensor is a standalone, venturi based flow sensor to measure air flow from main reservoir during brake release, train parting, alarm chain pull etc. Display unit calculates and indicates the instantaneous and reference air flow values. Abnormal conditions such as train parting, alarm chain pulling etc. are indicated to the driver.

Digital Air Flow Sensor

Alerts the driver in case of train parting, alarm chain pulling etc. Helps to detect excessive air leakages in the brake pipe of train formation Indicates complete train brakes release to avoid excess coupler force during propulsion

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Rolling Stock Equipment

Display Unit for Digital Air Flow Sensor


Surveillance System (Under licence from Rail & Road Protec GmbH, Germany) Surveillance system provides increased safety for vehicles and passengers by continuous monitoring and recording of real-time events for video replay. Different types of CCTV installations are provided for real-time recordings of critical or accident prone areas, both inside and outside of the railway vehicle.

Standard dome camera (analog or digital)

Cube camera (analog or digital)

Compact video recorder with hard disk or solid state storage medium

Saloon CCTV Recording and monitoring vehicle interior Video evidence of incidents

Pantograph CCTV Recording of OHE / Pantograph Evidence for investigation of incidents

Forward facing CCTV Clear view of track ahead Flooding, Maintenance works Observations

User Friendly Front End

Double password protection

Search by time and date

Simple graphical user interface

Connection via Ethernet or USB

Image zoom

Video analysis and service

Review live or recorded images

Image or video export to CD or DVD; AVI format supported

Bogie Mounted Brake System (under license from Knorr Bremse) Bogie Mounted Brake System (BMBS) for wagons consists of 2 Brake Cylinders (One with Parking Brake and the other without Parking Brake), 1 EL-60 Valve (i.e Empty Load sensing device), a set of Transversely mounted Brake Beams (2 Beams - One Primary with Brake Blocks and Brake Cylinder mounted on it and the other is Secondary with only brake blocks mounted on it.

EL-60 Valve (Empty Load sensing device)

Provided with lesser number of brake fittings, therefore, easy to maintain External slack adjusters have been eliminated Optimum braking performance ensures more uniform shoe and wheel wear EL-60 load-sensing valve protects the wheels from sliding by reducing empty-car braking forces

Brake Cylinder with parking brake

Unusual noise on run is completely eliminated BMBS is suitable for all the freight wagons which are fitted with CASNUB type bogies Beams are so designed that they can readily slide into the existing beam pockets of the CASNUB bogies and do not need operations like gas cutting, welding, fastening, or riveting

Rolling Stock Equipment

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Dynamic Brake Resistor (DBR) Medha supplies different types and ratings of DBR grids complete with blower motor and structural section for ease of mounting on the vehicle. DBRs are designed to continuously convert and dissipate rate amount of energy (generated because of braking) ranging from 1500 kW to 3000 kW, depending upon type, make and model of locomotive. Cooling blower (inclusive part of DBR package) will run either from the generated electrical braking power or from auxiliary power supply. Offered DBRs are suitable for Diesel (AC or DC traction) and Electric (usually DC traction) locomotives. In diesel locomotives, DBRs are also used for self-load power testing of engine and alternator, without needing external load bank.

Different designs to suit vehicle requirement (radial type, roof mounted type, underframe mounted)

Natural air convection or forced air convection Modular design for ease of installation and maintenance

Compact, light weight and rugged construction to withstand harsh working conditions

Models for GE, EMD, ALCo type locomotives

Suitable for locomotive ratings from 2000 HP to 6000 HP

Customized designs for other make and model of locomotives

Power dissipation 1500 kW to 3000 kW

In-house test facilities include 87 feet long wind tunnel for blower air flow testing

Highly efficient and durable braking resistors made of special alloy material

Grid cooling blower

Complete assembly of Dynamic Brake Grid

Brake Grid module

Low initial investment and product life cycle cost Reduced assembly and DBR installation time DBRs are also supplied as complete assemblies (including 6 or 8 set resistor bank, ac or dc motor and cooling fan or blower) such as è Ready to assemble, complete short hood fitted

with DBR and cooling fan è Ready to weld roof section, pre-fitted with DBR

grids and cooling fan

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Rolling Stock Equipment

DBR packages are available as standard models for locomotive repowering projects and are duly customized / designed to suit locomotive layout and space availability in case of new locomotive building or upgradation of old locomotives.


Signaling

Electronic Interlocking System Axle Counters Train Control System Block Proving Axle Counter Integrated Power Supply

44 46 48 50 50


Electronic Interlocking System for Signaling (CENELEC SIL4 safety standard) Medha's Electronic Interlocking System is a modular, fail safe and configurable signaling system which meets CENELEC SIL4 safety standards. System has large vital I/Os capacity and can be installed on a small or large station as a centralized or distributed installation with option to have centralized control to control multiple stations in a line section. Vital OFC communication between vital sub-systems can cover a range of upto 120 km, without needing repeaters. Medha's signaling system can interface with other systems such as ATP, CTC and other station equipment such as axle counters, data loggers etc.

Low initial investment even with different station sizes

Modular design for ease of maintenance and expansion

Improved safety and efficiency of railway network with system capability to handle heavy traffic

Customer friendly desk type panel processor or PC based Graphical User Interface

Online fault and event logging with troubleshooting guidance through maintenance terminal and remote monitoring

Technical training, offline and online after sales support and other user friendly, service support packages

Interlocking based on Boolean logic leading to faster design, verification and easier alteration

Features

Communication and Interfaces

Vital processing by safety proven microcontrollers microcontrollers

The communication between all the sub-systems on redundant OFC channels for ensuring high availability even in harsh railway environment

2oo2 (two-out-of-two) architecture with full redundancy

Provision for interfacing with any new substystem with open protocol interface

Additional features/capabilities

Safety Features

Primary and secondary negation of faults

Extensive Fault Diagnostics and Data analysis

Direct Lamp driving Direct Input reading OC (object controller) placement near point of control in case of distributed functions

Counter Box to record emergency cancellations done manually

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Signaling

Yard Signaling Control Room (at station)

Each and every fault is identified and indicated to the maintainer, along with the suggested corrective action Networking of Maintenance Terminals

Simulator Panel for Route Setting (lab model for testing)

Lightning Arrester ESE Type


Maintenance Terminal

CE

Visual Display Unit (VDU) for real time route setting and status feedback of yard

NE

LEC

SIL

4

é Operator Commands ê Yard data Indication

Object Controller (OC)

Points/Switch ç Point Status è Point Commands

Signals ç Signal Commands è Signal Status

Axle Counters ç Track Occupancy Status

Track Circuits ç Track Occupancy Status

Central Interlocking Unit (CIU) Interlocking Data Exchange

Other EIs Operator Interface

ç Block Status è Block Commands

Block Instruments

é CTC commands ê Yard Status

Centralized Traffic Control

è Output Commands ç Input Status

LC Gates Crank handles Ground Frames/Sidings

Object Controller (OC)

 Adaptability 2oo2 architecture with 100% hot standby and automatic changeover Includes all interlocking features such as route setting, route release, point operation, track occupancy monitoring, overlap protection, crank handle operation, level crossing gate operation, block working etc. Fixed and faster response time for all operations, irrespective of station size or complexity

Modular and highly flexible system for easy adaptation to different types of station layouts, configurations and signaling norms Single system capable of controlling yards upto 800 routes Even bigger yards can be controlled by cascading more interlocking units

Implementation Option to select between Centralized or Distributed system layout to suit yard conditions Redundant, optical fibre communication between CIU and OCs Short commissioning time No maintenance requirements

Modular architecture offers easy scalability and faster upgrades

MEI 634 - a modular Interlocking system which can handle from 64 to 2200 vital I/Os. Can be installed as wayside equipment in the yard or for bigger system in the Station Equipment Room.

Signaling

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Single and Multi Section Axle Counter (CENELEC SIL4 safety standard)

Reliable wheel counting with fail-safe occupancy detection. Medha’s Single Section Axle Counter (SSDAC) and Multi Section Axle Counter (MSDAC) overcomes track circuit limitations in situations including - water logging or flooding, metal bridges, long block sections, yards with poor wheel shunt lines, high EMI/EMC environments, tunnels, high temperature and sunshine regions, complex and large stations and yards etc.

Cost effective

Zero maintenance system

Suitable for different types of Rail profiles

Standalone systems, not dependent on type and make of Interlocking

Single-section Axle Counter (SSDAC)

Ÿ Ÿ

2oo2 architecture Hot stand-by communication over diverse media for higher availability

Configurations (SSDAC) Ÿ One detection point – Single section (1DP-1S): Typically used for sidings Ÿ Two detection points – Single section (2DP-1S): Straight line sections Ÿ Three detection points – Single section (3DP1S): Point zones. Ÿ Three detection points – Two consecutive sections or Auto-Section in a straight line (3DP2S/AS)

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Signaling

Suitable for main line, metro and high speed applications

Web-mounted sensors for reliable operation

Easy to install without needing any additional equipment

Multi-section Axle Counter (MSDAC)

2oo3 architecture Can evaluate upto 40 detection points and monitor upto 39 sections § Can cater to bigger stations or marshalling yards with cascading feature § §

Configurations (MSDAC) All configurations of SSDAC are covered in addition to below § Multiple detection points - Single section: Ladder § Consecutive single sections in a straight line segment and various other situations § Complex yard/station can be configured by user friendly GUI Yard Configuration Tool


Wheel diameter range 380 mm to 1092 mm Wheel speed upto 300 kmph

Sleepers: wood, steel, concrete, composite

Digital Axle Counter Unit Supports hot swapping of cards

e s fil kg ro / 52 il p s Ra 0kg 6

Wheel sensors IP68 protection

/9 0R

Two sensors working on electromagnetic field detection principle

Digital Axle Counter Reset Box Wheel counter with 4x20 dot matrix display

Installation § § § § § §

Replacement of existing track circuit with digital axle counters During station upgradation Construction of new stations Track length expansion Addition of new lines Upgradation of signaling system to computer based system

Visual Display Unit

Diagnostics Terminal

Electronic Interlocking Unit

Central Evaluator

Reset Panel

Supply package Includes Ÿ Ÿ Ÿ Ÿ

Wheel sensors Field units Central Evaluator Reset panel, VDU, DT and interconnecting cables

Line Verification Box

Compliance to International Standards DPFU 1

EN 50121, EN 50126, EN 50128, EN 50129, EN 50159

DPFU 2 Axle Detector

DPFU 40 Axle Detector

Axle Detector

Signaling

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Train Control System (TCS) (Train Collision Avoidance System â&#x20AC;&#x201C; TCAS) Medha's Train Control System (TCS) allows safe movement of trains within the Station vicinity and in Block Sections and prevents any train collision which can be caused due to overshooting of traffic signal (Signal Passing at Danger). TCS comprises of Station TCS and Loco TCS systems. Station TCS includes a wide network of RFID tags to specify the exact location of train. Aspect of approaching signal and movement authority is communicated to the approaching train. Loco TCS on the train, upon receiving these inputs, will calculate the required speed limit based upon distance-to-go and will accordingly control the train speed using brake application, if required.

Economical compared to ETCS solution

Safety against train collision due to human error

Features superior to ETCS Level 1

Ensures safe train operation under low visibility weather conditions

Specified Interoperability requirements and interoperability testing requirements

Enforce temporary and permanent speed restrictions

Full fledged ATP solution with SPAD protection

Features Communication and Interfaces

Safety Features

Full duplex UHF radio communication between station and train; Hot standby radios for higher availability; GPS interface for network time synchronization; GSM interface for fault data transmission to central server;

Vital processing by safety proven microcontrollers; SPAD (signal passed at danger) prevention; Loop line speed control, section speed and permanent speed restrictions supervision; Temporary speed restrictions supervision; Head-on, rear-end and side collision prevention; Standstill, reverse movement and roll-away protection; Manual and automatic SOS; Automatic train length computation;

Crew Friendly Features Cab signalling on driver machine interface (DMI); Level crossing gate alert to loco pilot with automatic whistling; Loop line clear indication; Crew protection alarm;

Station TCS control unit interface to station signaling system, TCS VDU unit, and TCS SOS unit for manual override of system.

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Signaling

Dipole antenna and modem for UHF (450-500 MHz) radio communication between loco and station TCS control units.

Fault Diagnostics & Data Analysis Real time display of train position; Centralized data analysis for all TCS equipment stations and locos;

Vehicle TCS unit in Locomotive control panel and DMI (Driver Machine Interface) 10.4â&#x20AC;? TFT LCD display on driver desk. TCS unit antennas mounted on loco roof.

RFID tags installed between the tracks at a maximum distance of 1 km. RFID reader mounted underneath the locomotive.


RADIO STATION ANTENNA

GPS & GSM ANTENNA

SIM OCP VDU

RADIO ANTENNA

STATION TCS CONTROL UNIT

Point/Switch status Track occupancy status

GPS & GSM ANTENNA SIGNAL ASPECT RELAYS

BRAKE INTERFACE UNIT

ONBOARD COMPUTER

RFID TAG READER

LP OCIP

SIGNAL POST

RFID TAGS

Fail safe modes § 2oo2 architecture for vehicle unit § 2oo2 architecture and hot standby for radio, GPS, and GSM in both station and vehicle units § Full ATP function § Station unit can identify collision situations even if interlocking makes a mistake § Redundant radios for communication

No Brake Application as long as speed is within permissible limits.

DMI (Driver Machine Interface) Information to Locomotive Driver § Simple interface – does not need continuous attention § Distance to go, upcoming signal aspect, current speed (and limit), operating mode and other driver relevant information

Application of brakes to control speed when speed exceeds permitted speed.

Signaling

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Block Proving Digital Axle Counter (BPAC) (CENELEC SIL4 safety standard; 2oo3 architecture) Medha's BPAC system ensures that the track section is empty before permitting another train in that section, eliminates human error and controls safe movement of trains between stations. No train is permitted if there is any other train, parted train, detached wheels, rail trolley or other rail vehicle in that section. Solid State Block Proving Digital Axle Counter (BPAC)

Operator Annunciator Panel for Stations

Standalone system - not dependent on type and make of interlocking

Can be used for Single or Double Line block section

Very low power consumption

Communication compatible for Quad cable, voice channel over OFC or dedicated OFC

Withstands adverse environmental conditions

Audio-visual intimation and acknowledgment feature for both end stations

Automatic functioning without human intervention

Integrated Power Supply (IPS) Medha’s IPS system provides un-interrupted steady voltage power supply to signaling system to safeguard against power interruptions and high voltage fluctuations.

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Single system sufficient for full signaling power requirements of up to six line station

n+1 redundant configuration, paralleled supplies

Modular and rugged construction to withstand harsh environmental conditions

Works with AC supply and battery

Both AC & DC output as per signaling system requirements and ratings

Surge, over load, over voltage, under voltage, short circuit and other protections

Signaling


Medha’s Research & Design Centre Medha is an R&D focused company with over 30 years of experience in designing and manufacturing components and systems for railway applications. In India, Medha is credited with reputation of having designed many high technology products and systems for the rst time in the country. The range includes Vehicle Control System, Electronic Governor, Vehicle Remote Monitoring, IGBT Traction Converters, Electronic Interlocking, Train Control System, Common Rail Direct Injection and many more. Medha also leverages its capabilities to design products and systems to suit customer specic requirements. Product cost competitiveness, short implementation times, ruggedness to withstand railway conditions, low life cycle costs, are some of the underlying guiding principles for product designs. All designs pass through internal validation and verication before being released for eld trials and commercial operation. With highly skilled technical team of over 400

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design engineers, and corporate nancial commitment to reinvest upto 20% revenue into R&D activities, continuous product improvement and new product innovation is an ever going activity at Medha. Medha's R&D centre at Hyderabad in India, is spread over 4 acres with over 200,000 sq.ft. built-up space housing various labs. Centre is equipped with latest software tools and testing facilities to support product development. Most of the customized test benches are unique to suit the product application for railway environment. Medha also has one of its kind facility for propulsion system integration testing with 25 kV OHE supply from railways. Medha is guided by well laid down quality norms and procedures for all stages of design and development activities. Award of quality certications such as ISO 9001:2008 and CMMI Level 3 are testament to Medha`s quality in product development. These achievements are not stopping Medha from working towards achieving higher quality certications including CMMI Level 5 and IRIS.


Medha's Production Facilities Medha's facilities at Hyderabad, India, are spread over 15 acres, with over 350,000 sq.ft. indoor space, housing production equipment and assembly lines. Over 1200 dedicated people work with SAP ERP enabled processes, using lean manufacturing practices to meet on-time delivery requirements. Stringent quality controls starts right from step one, when the material is received from the suppliers. In spite of special care being taken in selection of supplier, all inwards goods still undergo 'Inward Goods Inspection' before reaching the stores or production area. In most cases 100% inspection is carried out with sampling inspection for other components. Mechanical manufacturing facilities are equipped with latest CNC machines and automatic lathe, drilling, milling, presses, gear hobbing and other product specic special purpose machines. High precision mechanical products and components are manufactured in-house, in-line with our corporate quality policy. Medha designs its own electronic Printed Circuit Boards (PCBs) for all requirements. PCB assembly line is equipped with fully automated

radial, axial and IC component insertion machines, high performance pick and place machine for surface mounted devices (SMD), wave soldering machines for leaded components, re-ow oven for SMD, automatic optical inspection machine. PCB manufacturing and testing areas are ESD protected and equipped with air ltering. Products and systems are subject to subassembly and assembly level testing to ensure their reliable operation in the eld. Extensive test facilities for each product includes exhaustive functional testing using customized test benches and aging tests at elevated environmental conditions. Dedicated training department caters to our ever growing need for personnel knowledge and skills upgrades and to take knowledge of our latest products and technologies to our reputed clients. Newer technologies, production processes and systems are regularly studied and implemented to ensure continuous improvements in manufactured products.

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For a Good Cause At Medha, we go beyond the basics of ethical business practices and embrace our responsibility to the society. As a company that believes in technology and strives on innovation, we see the importance of helping the upcoming generation, who will be the backbone of the Indian society and responsible for growth and prosperity of the nation in the coming years.

Adding smiles, year after year

Empowering the future

In 2006, Medha started Medha Charitable Trust, which focuses on uplifting of students from economically weaker section of society and helps them in completing their education. Medha has pledged to fund the Trust with up to 20% of its annual profits. By the year 2016, the trust has distributed books free of cost to about 2,200,000 students.

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Books A student's best friend


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MEDHA SERVO DRIVES PVT. LTD. 2-3-2/A, Cherlapally, Hyderabad - 500 051, India Tel: +91-40-67237000 / 01 Fax: +91-40-27174908 exports@medhaindia.com, marketing@medhaindia.com www.medhaindia.com


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