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Driving rail vehicles triaxial - A 314

The accumulator fed locomotive A 314 (710 201-5) is three-axle driving rail vehicle designed for a light duty and medium heavy duty service at the railway sidings of the industrial enterprises, logistic terminals, for assembling wagons into trains at handling track ages owned by the railway operators.

Basic description

This vehicle was developed on grounds of the extensive reconstruction and modernization of diesel-hydraulic locomotive of 710 series (the original brand mark T334) made by ČKD Lokomotivka n.p. Praha, when only the frame and driving gear were retained from the original machine. All other parts of the towing vehicle are designed as new building. The vehicle is equipped with buffing and attachment mechanisms (it can also be supplemented with pneumatically controlled automatic coupler – unnecessary presence of the shunter during the locomotive’s connecting with wagon or with wagon sets). The remote control allows for unnecessary presence of the operator in the cabin during the operation.

Design

The vehicle consists of the base frame, on which there are placed two pre-built shelves on each side (battery compartment and power electronics with pneumatic control unit) and the tower cabin for the operator. The shunters gained a safe space at the slope stairway, where they are protected by a massive front-end of the machine. The machine is equipped with required lighting and, in addition, there are 2 strobe beacons at the cabin’s roof, which are activated in each case when the remote control is selected in operation.

The cabin is fitted with large windows, retractable side windows, windshield vipers in both directions of travel. The control panels are placed diagonally in both directions of travel, with ergonomic adjustable chairs. The cabin consists of the steel frame and body made of the steel sheets. The cabin is noiseless, insulated and heated. The entry into the cabin from both sides of the stands. The main service brake of the accumulator locomotive is the electrodynamic brake (EDB), which is based upon on the very principle of the asynchronous motor, when such motor under prevailing presence of the moment from load switches itself into generative mode regardless of the operator’s will. The current generated by traction electric motor goes into changer-rectifier and subsequently back to accumulator. Thus, the phenomenon called recuperation occurs.

Technical description

The electromechanical transfer of power is involved, where the source of electric current is traction lead accumulator with rated voltage of 720 V and capacity of 640 Ah, which is charged by the charger working on high-frequency charging principle. Any travel of the vehicle during the charging is excluded. On-board net is charging with the 24 V voltage the accumulator, which is constantly charged from the traction accumulator. The electric cable with the plug 125A to be used for connecting the charger to the 3×400 V network.

The electric current flows to the vector driven inverter and from there to externally cooled traction asynchronous squirrel-cage induction motor. The electric motor’s torque is transmitted through the clutch to the traction reduction gearbox and with the help of cardan shafts to the cabinets on the axle.

The power transfer system is controlled by a microprocessor unit, which receives feedback from the encoder (optoelectronic sensor of revolutions) built-in at the output shaft of the traction electric motor. When the operator files request for work performance, the vehicle will start its travel up the ramp of the inverter at the selected speed. Then, the controlling unit sustains the velocity independently on the slope and nature of torque from load.

Thanks to the full vector control of traction changer, it is possible to achieve high starting torque of the electric motor at very low speed. Another advantage of the traction inverter is the output frequency rising on adjustable ramp that would not allow for the motor’s any uncontrolled revolutions and, due to this, any slippage of the driving wheel sets in unfavourable adhesion conditions. The selection of the vehicle’s direction and speed is executed from two operating positions with the help of lever controller.

Benefits

  • Environmental friendly operation
  • Very significant operative cost reduction
  • Low noise
  • Easy operation
  • Favourable purchase price

Driving gear

Power transfer diagram

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