040-6723 7000     info@medhaindia.com

Train Information and Management System (TIMS)

In a Metro train where EMUs (Electric Multiple Units) run on push-pull principle, control systems are distributed over entire train. In such case, it is required to monitor the status and fault condition of all the control systems at a centralized place. To fulfil these requirements, Train Information and Management System (TIMS) was designed which has interface with all the control systems distributed over entire train in each coach through different communication protocols. Finally all the fault and status information is made available on TFT display on driver desk through user friendly menu driven screen.

In the Driving Motor Coach (DMC), Driver controls the train using Master Controller, Brake handle and other associated controllers. These driver commands are communicated to the other DMC and NDMCs (Non Driving Motor Coaches) using train line wires that carry control signals as well as feedback signals. Control signals are carried through train lines, but all the status signals, fault data and diagnostic signals are communicated to Train Information and Management System (TIMS) in each coach through interfaces such as RS 485/CANopen/hardwired. TIMS does necessary processing of the signals, event recording in case of faults and communicates all the necessary signals to TIMS in DMC through WTB (Wire Train Bus) for recording and display on Driver Display Unit (DDU), which is a TFT display.

  • Interfaces with different control systems distributed all over the train such as Traction Control Unit, Brake Electronics Control Unit, Door Control Unit, Speed Indicating and Recording System, Inverters and gets status and fault data of all systems through Inverters. Interfaces inside each coach are through RS 485/CANopen and coach to coach communication is through WTB (Wire Train Bus).
  • Records Status, event and fault code with fault data pack for each sub system in each coach.
  • Communicates each coach status data and fault code to both the DMCs for display into TFT based Driver display unit. Fault code for all the coaches are need to be stored into both the DMCs.
  • Automatic detection of addition or deletion of coach.
  • Automatic termination of WTB line at end coaches.
  • Monitors energy into DMC coach of each basic unit and extrapolates for the remaining coaches.
  • Displays all parameters to Driver through TFT based driver display unit on driver desk in each DMC.
  • Auto/Self test feature for Digital inputs, Outputs.
  • Provides a USB 2.0 compatible port with USB connector on the system for data extraction with a Pen Drive/Memory Stick.
  • Provides configurable settings for parameters through Display/Laptop/PC.
  • Downloads Fault log data to PC/Laptop and provides this data for report generation and Fault data storage in Excel file.

100 kVA Auxiliary Inverter

Auxiliary Inverter is designed and constructed to provide supply for Air conditioning units in underground metro coaches. The input of the Auxiliary inverter comes from Third Rail Current Collector (TRCC), which varies from 500 V DC to 1100 V DC. The output of Auxiliary Inverter is 100 kVA, 415 V, 3-phase, 50 Hz AC for Air conditioning units. The inverter topology and control strategy is based on IGBT’s and PWM technique. The Inverter operates based on the hardware commands (ON, OFF, TRIP, RESET) given from the driver cabin. Inverter sends all the Parameters, fault data etc. to driver cabin through CAN Communication. On-line data can be viewed and downloaded by using MEDHA Application software through RS 232 Port.

  • Input Under Voltage: Trip at 500 V, retrieve with 0-30V hysteresis (User configurable)
  • Input Over Voltage: Trip at 1100 V, retrieve with 0-30V hysteresis (User configurable)
  • Input Reverse Polarity protection
  • Input Fuse with fuse blown indication
  • Contactor at input for electrical isolation
  • Over load protection : at 200% of rated load for 5 seconds
  • Output short circuit protection
  • Single phasing protection
  • Earth fault protection
  • Over Temperature Protection
  • Voltage surge protection at input side: 2 kV for 5 mS
  • Protection against ingress of dust and water : IP65 for under-slung Cubicle.

50 kVA Auxiliary Converter

Auxiliary Converter is designed and constructed to provide supply 25 kVA AC for Air compressor loads and 25 kW DC for auxiliary loads (Doors, Lights, Battery Charging, Emergency loads etc.) in underground metro coaches. The input of the Auxiliary converter comes from Third Rail Current Collector (TRCC), which varies from 500 V DC to 1100 V DC. Auxiliary Converter consists of two outputs 25 kVA, 415 V 3-phase 50 Hz AC and 25 kW 110 V DC for Auxiliary loads and battery charger. The converter topology and control strategy is based on IGBT’s and PWM technique. The Converter operates based on the train line hardware commands (ON, OFF, TRIP, RESET) given from the driver cabin. Converter sends all the parameters, fault data etc. to driver cabin through CAN Communication. On-line data can be viewed and downloaded by using MEDHA Application software through RS 232 port.

  • Input Under Voltage: Trip at 500 V, retrieve with 0-30V hysteresis (User configurable)
  • Input Over Voltage: Trip at 1100 V, retrieve with 0-30V hysteresis (User configurable)
  • Input Reverse Polarity protection
  • Input Fuse with fuse blown indication
  • Contactor at input for electrical isolation
  • Over load protection : 200% load on 25 kVA AC section for 5 seconds
  • Output short circuit protection
  • Single phasing protection
  • Earth fault protection
  • Over Temperature Protection
  • Voltage surge protection at input side: 2 kV for 5 ms
  • Protection against ingress of dust and water: IP65 for under-slung Cubicle

5 kW DC-DC Converter

This DC-DC Converter is a PWM based DC to DC converter which converts 500 - 1100 V to 6 - 12 V DC variable output depending on user configuration. This DC-DC Converter is meant to feed momentary Field Injection Load of Metro Power Coaches during Dynamic Braking, hence it is named as FFE (Field Forcing Equipment). The input of the Auxiliary converter comes from Third Rail Current Collector (TRCC), which varies from 500 V DC to 1100 V DC. The output of the converter is user adjustable 6 V to 12 V. There is one contactor provided at output which is controlled by break system as required. The output voltage is used to feed the DC motor field winding which is controlled by controlling the output contactor. Converter sends all the parameters, fault data etc. to driver cabin through CAN Communication. On-line data can be viewed and downloaded by using MEDHA Application software through RS 232 port provided in the system.

  • Input Under Voltage: Trip at 500 V, retrieve with 0-30V hysteresis (User configurable)
  • Input Over Voltage: Trip at 1100 V, retrieve with 0-30V hysteresis (User configurable)
  • Input Reverse Polarity protection
  • Input Fuse with fuse blown indication
  • Contactor at input for electrical isolation
  • Over load protection : at 110% of rated load for 7 seconds
  • Output short circuit protection
  • Earth fault protection
  • Over Temperature Protection
  • Voltage surge protection at input side: 2 kV for 5 mS
  • Protection against ingress of dust and water: IP65 for under-slung Cubicle.
  • Contactor at output terminals along with fuses

Vision & Mission

To be World Leader in Railway Products

Enjoying Innovation and Applying Technology for improving the lives of people.
Enhancing the image of India in the world, in high technology.



R & D Centre

MEDHA SERVO DRIVES PVT. LTD. 2-3-2/A,
Behind Mint Compound, Cherlapally, R.R.Dist,
Hyderabad - 500 051 Telangana, India.
Phone: 91-40-6723 7000; Fax: 91-40-2726 4144
E-Mail: info@medhaindia.com
Corporate Identity Number:  U31103TG1984PTC004436

Regd Office

MEDHA SERVO DRIVES PVT. LTD. P-4/5B, IDA, Nacharam, Hyderabad - 500 076 Telangana, India
Phone: 91-40-2717 1101; Fax: 91-40-2715 4706

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