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Medha Servo Drives Private Limited

Hyderabad, Telangana

| GST  36AABCM3917A1ZY

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Other Products

Our range of products include Traction Converter, Microcontroller Based Governor, Auxiliary Inverter Motors, Vigilance Control Device, Electrical Locomotivet Auxiliary Converer and Fault Diagnostic System.

Traction Converter
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Traction Converter

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IGBT based design reduces circuit complexity and improves reliability
Independent Motor Control enables
Better wheel slip control leading to improved adhesion
Better Tractive Effort independent of wheel diameter variation (variation of wheel diameters allowed within a bogie)
Any failure in Traction Inverter (blower, IGBT, sensor, computer etc) will lead to only one motor being cut-out, hence lesser power reduction compared to bogie cut-out
Customizable parameter settings to adapt to different Traction Motor types without changing software
In case of Passenger Locomotives, Hotel Load converter (Head End Power) can be installed with some additional space.

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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.



Additional Information:

  • Item Code: MEG601

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Auxiliary Inverter Motors
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Medha's 3 Phase AC motors with built-in inverters are designed using a DSP (Digital Signal Processor) for control and IGBT semiconductor power devices in inverter. These AC Motor-Inverter combinations are a good retrofit alternative for failure prone and high maintenance DC Motors used for the same functions in older locomotives. The Inverter takes DC supply from locomotive batteries and provides required sinusoidal supply to 3-phase AC motors.

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Vigilance Control Device
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Vigilance Control Device

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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.

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Electrical Locomotivet Auxiliary Converer
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This System converts single phase power from Locomotive Transformer to three phase 50Hz power to supply to all auxiliary loads of Electric locomotive. It is direct replacement of Single phase to three phases ARNO Converter.

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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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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.



Additional Information:

  • Item Code: 50kVA

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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.



Additional Information:

  • Item Code: 25KVA

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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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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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Medha is one of the leading manufacturers of Speed Recorders for Railway applications. These recorders are used on Locomotives and are similar in function to Black boxes in aeroplanes. Speed Recorders are used for monitoring the performance of Loco Driver and especially in the event of an accident the recorded data becomes vital for establishing the cause of accident.

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