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Medha Servo Drives Private Limited

Hyderabad, Telangana

| GST  36AABCM3917A1ZY

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Medha Servo Drives Pvt. Ltd., founded in 1984, is focused on rail transportation. Since inception, Medha has used Research and Development as a tool for success and today we are proud to be known for our product range, domain knowledge, design expertise, quality and manufacturing capabilities. Starting from humble beginning, over the last 25 years our company has grown to employ over 1100 talented people whose commitment has led to a sales revenue of INR 1.7 billion (approximately USD 34 million), with the revenues growing at the rate of 88% year over year for the past three years. Medha¿s vision is to become a world leader in railway products and to achieve this we specialise in three areas, Control Electronics, Power Electronics and safety critical Signalling. We have designed and manufactured various world-class high-tech electronics products for application on locomotives, coaches, railway stations and yards. We specialise in designing and engineering our products to withstand shock and vibration, wide temperature variations, and electrical disturbances that are typical of harsh locomotive environment. Our strength lies in designing, customising and integrating systems that involve multiple functional domains such as control electronics, power electronics, fail safety and mechanical construction. Medha¿s Design Centre is 250 people strong and has all the infrastructure required for developing sophisticated products. Medha has also achieved CMMI Level 3 certification for well defined design processes for new product development. We are currently working towards CMMI Level 5 certification by further improving our design processes. At Medha, our products, our people and our approach to business are held to only the highest standards. We build quality into our products by following well designed processes and implementing end-to-end manufacturing. We profoundly believe in professional management at all levels and strictly follow Quality Assurance System as per ISO 9001:2000 standard. Medha was awarded ISO 9001:2000 certificate by American Quality Assessors accredited by ANAB and established a reputation for quality products and excellent after sales service. Since our foundation, our quality policy has been, ¿To provide products meeting customer satisfaction with excellence in performance and cost effectiveness through a continually improving Quality Management System¿. Medha¿s motto being ¿translating technology into innovative solutions¿, our employees believe in making our customers¿ lives better by designing better products and improving existing products. To us, the idea of innovation extends beyond building a product. We continue to train our customers and service the product throughout the design life of a product (typically 10 ¿ 20 years). Medha¿s Corporate Office, Manufacturing Unit and Design Centre located in three different areas are built over a combined area of about 13 acres of land in the heart of industrial areas near Hyderabad, India. These state-of-the-art facilities encompass the capability to design, develop, manufacture, service and provide in-field product support. In 2007, Medha started a charitable institution by the name of ¿Medha Charitable Trust¿ for the upliftment of poor students. It is the goal of the trust to improve the lives of these students by supporting them throughout their education and helping them become self sufficient in the long run. The trust has touched the lives of more than 94,000 students in various schools within the first two years of its establishment.+ Read More

Nature of Business

OEM Manufacturer

Total Number of Employees

1001 to 2000 People

Year of Establishment

1984

Legal Status of Firm

Limited Company (Ltd./Pvt.Ltd.)

Annual Turnover

Rs. 100 - 500 Crore

GST Number

36AABCM3917A1ZY

Traction Converter
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Traction Converter

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Independent Traction Inverters

Six independent Traction Inverters controlling separate Traction Motors

Each inverter consisting of DC Link Isolation Switch, DC Link capacitor, three phase modules, Traction computer and associated sensors, and one variable speed blower.

Any failure or fault will lead to only one Traction Inverter / Traction Motor being cut-out.

Variable blower speeds and cooling irrespective of Companion Alternator output voltage / frequency or Engine speed.

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Locomotive Control Computer
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  • Improves Locomotive Availability (reduced down times)
  • Improves Adhesion with Independent Motor Control philosophy
  • Improves Engine Utilization (GHP based control)
  • Monitors all Traction Equipment on-board for Safe Operating Margins
  • Customizable parameter settings to adapt to different locomotive types without changing software
  • Modular expandable platform for added functionality like Automatic Engine Start Stop, Remote Monitoring, Distributed Power Control etc for fuel savings, increased availability and monitoring.

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Locomotive Control System
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Excitation and Auxiliary Generator Control
Continuously monitors train line signals (MU signals) and controls excitation of the Alternator based on the operating requests of driver
Measures various analogue and digital feedback signals from traction equipment and controls alternator excitation to maintain constant Gross Horse Power (GHP) load on the diesel engine
Ambient temperature correction, Altitude correction, and Fuel Specific Gravity correction provided for site HP calculation
Controls excitation of Auxiliary Generator to maintain constant output voltage for charging Battery and powering auxiliaries in spite of variation in engine speed from IDLE to 8th notc
Accurate digital PID control eliminates need for potentiometer settings making the system free of adjustments for lifetime
Propulsion and Dynamic Braking Control
Digital propulsion control eliminates various interlocking relays, interlocks and associated wiring. This enhances reliability of the locomotive and ease maintenance

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Microcontroller Based Governor
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Microcontroller based Governor MEG-601 uses state-of-the-art technology, for controlling Diesel Engine of Diesel Electric Locomotives. This is a maintenance free alternative to the hydraulic Woodward Governors popularly used for this application. The Governor consists of a Control Unit mounted in the Driver cab, and an Actuator Unit mounted on the Engine. The Actuator Unit can be mounted exactly on the same Engine base as Woodward Governors. The Governor controls the engine speed, based on throttle handle position (popularly known as notch) selected by the Driver on the Driver Desk. Engine RPM is measured from a Tachogenerator or speed sensor mounted on the Engine. Digital PID control is used to calculate desired fuel rack position dynamically, based on the selected notch on throttle handle and measured Engine RPM. A Stepper motor drive is used in the Actuator Unit to control the fuel rack of Diesel Engine. The Governor also controls load on the engine electrically, so as to limit horsepower at each notch to a preset level, through an electrical interface with the excitation system of Locomotive. Booster (Turbo) air pressure is measured through a pressure sensor mounted in the air manifold. Movement of fuel rack is limited as a function of this pressure so as to prevent incomplete combustion of fuel, black smoke, excessive engine temperature, fuel wastage etc caused by lack of air to burn the fuel. Lube oil pressure is continuously monitored and Engine is shutdown if the lube oil pressure is less than the specified pressure at each notch position. This protects the Engine from damage due to malfunction of lube oil pump etc.

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Tft Driver Display
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Tft Driver Display

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Application

Driver's display console for Locomotives / EMUs / Metro Cars for showing running data (status information), historical data (Event / Fault logs), maintenance related data and for data entry.

Operating Principle

The Multifunction TFT LCD Display is used in Locomotives as Man Machine Interface for guiding the operator to control the Locomotive. It communicates with the Locomotive Control System by either RS232 or RS485 link. It displays the data sent by the Locomotive Control System in graphical as well as text format.

The data received from the Locomotive Control System can be displayed in graphical form as circular or linear dials, or as a simple text. Status information can be shown in the form of status icons or coloured boxes or buttons. The overall layout of the display screen can be programmed as per customer requirement.

Fault messages, maintenance remedy messages and any other relevant information is displayed in specified display areas in simple text format. Data input for operator or maintenance configuration related parameters can be done through keypad provided or through touch screen when available.

The display can communicate with 2 different systems on serial link and process the combined data for displaying simultaneously. The display screens are programmable and the layout, language etc of display screen can be customized to suit various locomotive model and geographical locations.

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Auxiliary Inverter Motors
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Three types of motors are used for different functions in the locomotive.

  1. 1.5 HP Fuel Pump Motor with pump.
  2. 0.87 HP Dust Exhauster Blower Motor with blower.
  3. 0.5 HP Crank Case Blower Motor with blower.

These inverter motors are protected for input under voltage, input over voltage, output overload, output short circuit, input reverse polarity, over temperature. Surge protection as per IEC 571.
Inverter module is divided into two sections.

1.Booster section:
It is used to generate stable DC link voltage for PWM inverter, which is independent of input voltage variations. The switching element of the Booster circuit consists of MOSFET module. All features of booster are monitored and controlled through DSP.

2.Inverter section:
It uses three half bridge IGBT phase modules and a DSP control card. DSP controller circuit generates the inverter PWM signal for IGBTs to synthesize a Sine Weighted PWM voltage with required output frequency. The control card is responsible for overall system control through status monitoring, diagnostics and PWM waveform generation for inverter.

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Auxiliary Converter
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Auxiliary Converter

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SYSTEM DESCRIPTION
Single Phase to Three Phase 180KVA Static Converter will take Single Phase Supply from the Locomotive main transformer tertiary winding and will use a Rectifier to derive a stable DC link voltage and unity power factor at input stage. The DC Link is unaffected by supply voltage variations. This DC link will be used as input to the three - phase Inverter, which will utilise IGBTs to synthesise a three-phase Sine Weighted PWM waveforms, with a fundamental voltage of 415 Vrms line to line. Since IGBTs are used as switching devices in the inverter, the system reacts fast to any of the fault conditions and protects itself and loads from all fault conditions. A Battery Charger is also built-in to cater to DC loads and to Charge the battery.

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Fault Diagnostic System
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Fault Diagnostic System

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This system is designed for Propulsion Control of Tap Changer type electric locomotives of WAG, WAM and WAP series of Indian Railways. It eliminates the intermediate relay control logic of the locomotive with a micro controller based system thus enhancing the availability by eliminating Intermediates relays, their interlocking and associated wiring.

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Speed Time Distance Recorder
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MRT 918 is used on Diesel Electric Locomotives. It can also be used for Electric Locomotives, Rail Cars and Electric Multiple Units. These Digital Tachographs are used for indication and recording of speed, time, distance, other locomotive operating parameters. This is a Microcontroller based system with high accuracy and better reliability. The system also records data of Dynamic Braking, Coasting Duration and operation of Tractive Effort limiting switch (ON/OFF) of the locomotive. Apart from these parameters, any five digital inputs can be interfaced for monitoring and recording purpose. The data is recorded in a compact credit card sized and rugged memory card, consists of State-of-Art high density flash memories, which do not require any battery for retaining the data. Also full backup of same data is maintained in the Recorder. Recorded data can be retrieved, analyzed and printed using Data Retrieval Unit, connected to a PC with data analysis software MSW 918.

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Speed Time Distance Recorder
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The MRT 912 system is designed, comprising of an axle mounted Speed Sensor to give the speed signal, a micro controller based measuring and control system to compute the speed and distance, DC Step Motors to drive the Recording styluses for speed and time graph, as well as Hour printing wheel, and a computer controlled DC Step Motor driven pointer for speed indications. The number of components is very much reduced by using micro controller for processing. Hence the reliability of the system is proven to be very high. Further the DC Step Motors selected are very small in size and highly reliable. A switch mode power supply has been designed which can cater for wide fluctuations in the loco battery voltage.

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Speed Time Distance Recorder
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MRT 915 type Recorder is developed specifically for ABB locomotives with waterproof non-contact memory card (no connector). The system measures, indicates and records speed, time & distance, and in addition to this up-to 8 digital inputs are monitored and their status is recorded. The data is recorded in a compact credit card sized memory card. Also full backup is maintained in the Recorder also for same data. At preset 60 units are working in the field.

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Energy Recorder
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Energy Recorder

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MRT 922 Recorder is Speed cum Energy monitoring system for both conventional and three phase locomotives. Except some of the features and specifications rest are same as MRT921.

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Energy Recorder
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Energy Recorder

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Used on AC Locomotives, Electric Multiple Units and DC Electric Multiple Units for Speed Indication, Recording and Energy Monitoring.

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Test Bench
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Test Bench

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TB-03 is a system ideally suited for Test Rooms in Loco Sheds for testing of Recorder cum Indicator, additional Indicator type MRT-912, Pulse generator type T-812 and Optical Speed Sensors type T-813 and T-813M. It can also be used for testing Memory type Speed cum Energy Recorders and Indicators type MRT 921 and MRT 922. It work on 230 VAC, 50 Hz power supply. Complete set of Recorder cum Indicator, additional Indicator and Pulse Generator/ Speed Sensor can be tested in a totally simulated environment using the Pulse Generator/Speed Sensor Test Simulator.

Recorder cum Indicator and Speed Indicator can also be tested and calibrated for Speed accuracy by using computer controlled accurate Speed Simulator Type SS-03. Accuracy of Energy calibration for MRT 921 and MRT 922 is verified by checking the accuracy of OHE voltage and OHE current measurement.

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Inverters
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Inverters

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It converts the available DC voltage from coach battery into 1 phase (2.5 kVA & 5 kVA) / 3 phase (25 kVA & 30 kVA) AC voltage to operate coach electrical equipment such as air-conditioner, fans, lights, electrical outlets etc.

The capacity and number of phases of the output of the inverter will depend on application of the equipment.
For example 25 kVA / 30 kVA, 3 phase, 415V, 50 Hz AC inverter is used to operate Air Conditioning Compressor & Fan motors, while 5 kVA / 2.5 kVA, 1 phase, 110V, 50 Hz AC inverters are used for coach fans, lighting and electrical charging outlets respectively.
The inverters are designed for underslung (underframe) mounting and are naturally cooled. They are designed for continuous full load operation even when the coach is stationary.

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Electronic Interlocking System
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Medha’s Electronic Interlocking System MEI 633 is a fail-safe, state-of-the-art Distributed Interlocking System. The System has been designed to CENELEC Standards to meet SIL-4 safety specification. It is based on two out of two architecture with a hot standby provision and automatic change-over facility. The System provides all the Interlocking features including Route Setting, Route Release, Point Operation, Track Occupancy Monitoring, Overlap Protection, Crank Handle Operation, Level Crossing Gate Interlocking, and provision for Block working.

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Vigilance Control Device
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Vigilance Control Device

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Application

Vigilance Control Device (VCD) is a microcontroller based safety device which will automatically apply penalty brakes in case the driver is incapacitated or dead. Similar operation is available in older locomotives in the form of Deadman’s Lever.

Operating Principle

Installed on locomotive, VCD will give cyclic warning to the driver. Based on drivers reaction to this warning (in terms of any of the pre-defined sets of actions to be done by the driver), the system will automatically reset the alerting cycle. In case the driver fails to acknowledge to the initial alert signals, a set of additional alert indications are given. Failing to respond to these aditional alert signals also will result in automatic application of penalty brakes.

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Inverter
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Inverter

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To Power Compressor and Fan Motors of Roof mounted AC package unit in AC Railway Coaches.

OPERATING PRINCIPLE
The Input DC Voltage is boosted to higher Voltage levels suitable for particular operating Voltage. The boosted voltage is fed to a 3Ph PWM Sine-wave Inverter to get Three phase Output. The Three Phase output is passed through harmonics filter and is also protected against Short circuits and overloads.

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