SD70ACs Locomotives Manual Quiz
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Questions and Answers

What primary function does the EM2000 serve in the SD70ACs locomotives?

  • Regulating passenger comfort and safety systems
  • Increasing fuel efficiency through optimization
  • Monitoring and managing locomotive traction power (correct)
  • Providing manual control to the operator

    • Which of the following statements accurately describes the EM2000?

  • It is a microprocessor-based control system. (correct)
  • It can only indicate faults but not control systems.
  • It is a mechanical system that requires frequent adjustments.
  • It monitors only the locomotive's braking systems.

    • What aspect of the locomotive does the EM2000 NOT specifically control?

  • Dynamic braking
  • Fault recording and indication
  • Traction power
  • Throttle control adjustments (correct)

    • Who is the intended audience for the manual regarding the SD70ACs locomotives?

    <p>Railroad personnel who operate the locomotives</p> Signup and view all the answers

    What types of systems can the EM2000 enable testing for?

    <p>Any locomotive system as required</p> Signup and view all the answers

    What function does the F.I.R.E system perform concerning the fuel tank monitor?

    <p>It receives fuel depth information and displays the fuel quantity.</p> Signup and view all the answers

    Which system does F.I.R.E NOT directly interface with?

    <p>Emergency Communication System</p> Signup and view all the answers

    How does the F.I.R.E system contribute to speed management on locomotives?

    <p>It displays speed data from traction motor sources and connects with other systems.</p> Signup and view all the answers

    What is the primary role of the EOT display within the F.I.R.E system?

    <p>To indicate the operational status of the End of Train device.</p> Signup and view all the answers

    What purpose does the Event Recorder serve within the F.I.R.E system?

    <p>To collect, record, and download data and events regarding locomotives and operators.</p> Signup and view all the answers

    What is the role of the F.I.R.E system in the air brake system?

    <p>To provide an interface for setting up and testing the air brake system.</p> Signup and view all the answers

    What advantage does a computer-controlled air brake system have over conventional pneumatic systems?

    <p>It reduces the need for maintenance and simplifies troubleshooting.</p> Signup and view all the answers

    Which component replaces conventional pneumatic control relays and valves in the computer-controlled air brake system?

    <p>Electro pneumatic control unit.</p> Signup and view all the answers

    How does the air brake computer function within the electro pneumatic control unit?

    <p>It controls various portions to achieve required brake functions.</p> Signup and view all the answers

    What does the air brake controller on the driver's workstation include?

    <p>Automatic and independent brake handles along with electrical devices.</p> Signup and view all the answers

    What high voltage can the input filter capacitors in an AC traction system operate at?

    <p>3000 VDC</p> Signup and view all the answers

    Who is permitted to access devices within the electrical control locker of the locomotive?

    <p>Maintenance personnel knowledgeable in discharge procedures</p> Signup and view all the answers

    What is a significant danger when the locomotive is shut down regarding the DC link?

    <p>It can cause severe harm to the operating and maintenance personnel due to retained high voltage.</p> Signup and view all the answers

    Which of the following statements is true regarding the DC link discharge procedure?

    <p>The procedure is not required during normal operation.</p> Signup and view all the answers

    What happens to the high voltage in the DC link when discharging is necessary?

    <p>It is safely discharged into the dynamic brake grids.</p> Signup and view all the answers

    What is one of the key components featured in the car body of the SD70ACe?

    <p>Electrical locker</p> Signup and view all the answers

    Which hood is associated with the driver's cab in the SD70ACe's body arrangement?

    <p>Short hood</p> Signup and view all the answers

    Which component is located next to the electrical locker in the SD70ACe?

    <p>Alternator compartment</p> Signup and view all the answers

    What structural feature is prominently included in the SD70ACe design?

    <p>Long hood</p> Signup and view all the answers

    What purpose does the short hood serve in the SD70ACe locomotives?

    <p>Contains the driver's cab</p> Signup and view all the answers

    The input filter capacitors in an AC traction system can operate at voltages as high as 3000 VDC.

    <p>True</p> Signup and view all the answers

    When the locomotive is shut down, the input filter capacitors immediately discharge their high voltage.

    <p>False</p> Signup and view all the answers

    Only maintenance personnel knowledgeable in special high voltage discharge procedures are allowed to access devices within the electrical control locker.

    <p>True</p> Signup and view all the answers

    The DC link discharge procedure is required during normal operation of the locomotive.

    <p>False</p> Signup and view all the answers

    The DC link voltage is only present at the output terminals of the main generator.

    <p>False</p> Signup and view all the answers

    Study Notes

    SD70ACs Locomotives

    • This manual is intended for railroad personnel operating Electro Motive Diesel, Inc. SD70ACs diesel electric locomotives.
    • The SD70ACs is equipped with a microprocessor-based control system.
    • The microprocessor is referred to as "locomotive computer" and/or "EM2000".
    • The EM2000 system has the following functions:
      • Monitors and controls locomotive traction power and dynamic braking.
      • Records and indicates faults.
      • Enables testing of various locomotive systems.

    ### Locomotive Electronics Subsystem - F.I.R.E Relationship

    • The F.I.R.E system controls the alerter system and displays the ALERT indicator with a countdown on its screen.
    • F.I.R.E performs counting functions for distance and length, providing a crew interface.
    • F.I.R.E facilitates setup and operation of distributed power equipment.
    • F.I.R.E provides a setup interface for the electronic air brake.
    • F.I.R.E serves as the crew interface for the EM2000 Locomotive Computer.
    • F.I.R.E collects, records, and allows for the download of locomotive and operator data and events, following railroad regulations.
    • F.I.R.E receives fuel depth information, converts it, and displays the fuel quantity on the screen.
    • F.I.R.E displays the status of the End of Train (EOT) device and relays emergency brake requests from the EOT.
    • F.I.R.E warns the driver and initiates penalty brake application in the event of an overspeed situation.
    • F.I.R.E displays speed information from traction motor sources and communicates it to other systems.

    Introduction to Electronic Air Brake System

    • The system is computer controlled and uses the F.I.R.E system for setup and testing.
    • The system manages air brakes on locomotives and coupled train cars.
    • By using computers, the system eliminates electrical and pneumatic components, reducing maintenance and troubleshooting.
    • The electro pneumatic control unit replaces conventional pneumatic control relays and valves.
    • The air brake computer controls the electro pneumatic control unit to produce automatic and independent brake functions
    • The air brake controller, located in the driver's workstation, has automatic and independent brake handles that send signals to the air brake computer.

    Input Filter Capacitors

    • Input filter capacitors filter the rectified main generator output (DC link) before it reaches the traction inverters.
    • The DC link voltage can be as high as 3000 VDC.
    • These capacitors can retain the high voltage even when the locomotive is shut down.

    Safety Precautions

    • High DC link voltage is present on all equipment connected to the main generator output, including:
      • Main generator output terminals and cabling connections
      • Capacitor cabinets
      • Rectifier assemblies
      • DCL switchgear
    • The DC link discharge procedure is not required during normal operation.
    • Train drivers should not access devices within the electrical control locker due to residual high voltage.
    • Access is limited to maintenance personnel trained in high voltage discharge procedures.
    • This restriction does not apply to electrical panels used in normal operation, such as the Circuit Breaker Panel.
    • A procedure has been developed to automatically discharge the high voltage into the dynamic brake grids.
    • This procedure minimizes the possibility of personal injury.

    EM2000

    • The EM2000 is a microprocessor-based control system for SD70AC locomotives.
    • It controls various aspects of the locomotive, including the engine, transmission, and brakes.
    • It allows for testing of different systems.
    • The EM2000 does not specifically control the locomotive's body arrangement.

    F.I.R.E System

    • The F.I.R.E system is a sophisticated monitoring and diagnostic system that monitors the fuel tank levels for leaks or anomalies.
    • It interfaces directly with the engine, transmission, brakes, and air brake systems.
    • It uses data from the engine to adjust the locomotive's speed and power output.
    • The system provides real-time information to the engineer through the EOT display.
    • The Event Recorder within the F.I.R.E system records data for later analysis in case of failures.
    • The F.I.R.E system interacts with the air brake system by monitoring and controlling the brakes through an electro pneumatic control unit.
    • It replaces conventional pneumatic control relays and valves, enabling more precise speed control and braking, and faster response times.

    Air Brakes

    • Computer-controlled air brakes use an air brake computer to deliver the air to the brake cylinders.
    • The air brake controller for the driver's workstation includes displays and buttons for controlling the brake system.
    • The input filter capacitors in an AC traction system can operate at extremely high voltages.
    • Only qualified personnel should access the electrical control locker to ensure safety.
    • When the locomotive is shut down, the DC link retains electrical energy, and the capacitors must be discharged for safety.
    • During the discharge procedure, the energy stored in the DC link is gradually released and reduced to a safe level.

    SD70ACe Locomotives

    • The SD70ACe features a car body design with a distinctive short hood toward the rear.
    • The driver's cab is located near the long hood, and a separate electrical locker is positioned next to it.
    • The SD70ACe includes a unique structural feature known as the "short hood" at the rear.
    • This short hood houses equipment that is essential for the locomotive's operation.
    • The short hood serves to protect equipment and provide space for various components.

    AC Traction System Input Filter Capacitors

    • Input filter capacitors are essential components in AC traction systems.
    • These capacitors filter the DC link (rectified main generator output) before it reaches the traction inverters.
    • The DC link voltage can reach up to 3000 VDC.
    • When the locomotive is shut down, the DC link voltage can remain high for extended periods.
    • The DC link voltage is present on various equipment connected to the main generator, including:
      • Main generator output terminals
      • Cabling connections
      • Capacitor cabinets
      • Rectifier assemblies
      • DCL switchgear
    • WARNING: The DC link discharge procedure is not necessary during normal operation.
    • Train drivers should avoid accessing any devices within the electrical control locker due to residual high voltage.
    • Only maintenance personnel trained in special high voltage discharge procedures should access these areas.
    • This restriction does not apply to electrical panels used in normal operation, such as the Circuit Breaker Panel.
    • To minimize the risk of personal injury, a procedure exists to automatically discharge the high voltage into the dynamic brake grids.

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    Description

    This quiz is designed for railroad personnel who operate the SD70ACs diesel electric locomotives. It covers the essential features of the EM2000 microprocessor control system, including its functions in monitoring, fault recording, and testing. Test your knowledge and understanding of this advanced locomotive technology.

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