Auxiliary Converter Unit (ACU) Overview
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What is the primary purpose of the Auxiliary Converter Unit (ACU)?

  • To supply power to the traction system and auxiliary loads (correct)
  • To provide heating in the passenger compartment
  • To store energy for emergency use
  • To control the speed of the train's motors

    • Where is the Auxiliary Converter Unit typically installed in a basic train unit?

  • In the leading car of the train
  • In the middle car's high-tension compartment (correct)
  • In the passenger compartment
  • In the rear car of the train

    • What output voltage does the Auxiliary Converter Unit provide for charging batteries?

  • AC 110V
  • DC 220V
  • AC 415V
  • DC 110V (correct)

    • During AC operation, how is the Auxiliary Converter Unit fed?

    <p>From the four quadrant regulators of the drive power converter</p> Signup and view all the answers

    What happens if an Auxiliary Converter Unit fails?

    <p>Power is supplied by a neighboring unit</p> Signup and view all the answers

    Which output of the Auxiliary Converter Unit supplies the passenger compartment fan?

    <p>AC 110V</p> Signup and view all the answers

    What is the input voltage designed for the Auxiliary Converter Unit?

    <p>DC 1500V</p> Signup and view all the answers

    What is the primary function of the Pulse-width-modulated inverter modules in the Auxiliary converter?

    <p>To feed DC supply to the transformer for high voltage operation</p> Signup and view all the answers

    Which component is responsible for charging the battery in the train?

    <p>Battery charger module</p> Signup and view all the answers

    What type of voltage do the Pulse-width-modulated inverter modules operate with?

    <p>DC supply</p> Signup and view all the answers

    How are the PWM outputs from the inverter modules utilized in the system?

    <p>They are fed to the transformer for high DC link voltage</p> Signup and view all the answers

    What components work alongside the main transformer to support the operation of the Auxiliary converter?

    <p>Internal fans and line choke</p> Signup and view all the answers

    Which of the following is a correct relationship between the Battery charger and the main Transformer?

    <p>The Battery charger is connected to transformer DC output via a rectifier</p> Signup and view all the answers

    What is the role of the sine filter resistor in the Auxiliary converter?

    <p>To reduce the harmonics in the output voltage</p> Signup and view all the answers

    Identify one component that is used to support the internal temperature management of the Auxiliary converter unit.

    <p>Air intake temperature sensor</p> Signup and view all the answers

    Which component's function is solely to prevent voltage spikes in the circuit?

    <p>OVP resistor</p> Signup and view all the answers

    What voltage is generated at the output by the battery charger?

    <p>DC 110V</p> Signup and view all the answers

    What current is the maximum battery charging current specified as?

    <p>30A</p> Signup and view all the answers

    Under which condition does the Auxiliary Converter Unit switch ON automatically?

    <p>No errors on the ACU</p> Signup and view all the answers

    What is the charging voltage when the battery charging current decreases?

    <p>U1=110V</p> Signup and view all the answers

    How are the PWMI modules activated?

    <p>By the ACU control signal</p> Signup and view all the answers

    What happens when the activation signal is withdrawn by the vehicle control?

    <p>ACU switches OFF</p> Signup and view all the answers

    Which device rectifies the input for battery charging?

    <p>Battery charger input rectifier</p> Signup and view all the answers

    What is the nominal voltage of the lead acid batteries used in the train?

    <p>DC 110V</p> Signup and view all the answers

    What component is used to filter the output of the ACU?

    <p>Sinus filter</p> Signup and view all the answers

    What feature does the IU-characteristic refer to?

    <p>Load program</p> Signup and view all the answers

    What is the primary function of the M1300 SIBCOS Main controller?

    <p>To control the overall operation of the Auxiliary Converter and monitor for faults</p> Signup and view all the answers

    Which component is responsible for communication between the Auxiliary Converter and external devices?

    <p>M9000 CAN bus Communication card</p> Signup and view all the answers

    What is the purpose of the DC Line choke?

    <p>To filter out the ripple in the DC link voltage</p> Signup and view all the answers

    How many primary windings does the Main Transformer have?

    <p>Two three-phase primary windings</p> Signup and view all the answers

    What is the function of the Battery Charger filter choke?

    <p>To filter out DC voltage after rectification from the transformer secondary</p> Signup and view all the answers

    Which voltage outputs does the Main Transformer provide?

    <p>Three-phase 415 Volts, one-phase 110 Volts, and three-phase 500 Volts</p> Signup and view all the answers

    What role does the Main Blower serve in the system?

    <p>It cools the modules, transformer, and line choke.</p> Signup and view all the answers

    What type of choking mechanism is utilized in the DC Line choke?

    <p>Inductive filtering</p> Signup and view all the answers

    Which component would you identify as essential for the AC-DC conversion process?

    <p>PWM inverter</p> Signup and view all the answers

    What type of voltage does the DC Line choke primarily focus on filtering?

    <p>Ripple in DC link voltage</p> Signup and view all the answers

    What is the static tolerance of the output voltage for the 110 V AC supply?

    <p>± 10 %</p> Signup and view all the answers

    What is the maximum output current of the 110 V DC battery charging equipment?

    <p>82 A</p> Signup and view all the answers

    Which of the following is NOT part of the safety regulations for working on the ACU?

    <p>Check the output frequency</p> Signup and view all the answers

    What is the total harmonic distortion of the output for the AC supply?

    <p>&lt; 10 %</p> Signup and view all the answers

    What is the nominal power output for the 110 V DC battery charging equipment?

    <p>9 kW</p> Signup and view all the answers

    What is the static tolerance range of the output voltage for 110 V DC supply?

    <p>+20%, -30%</p> Signup and view all the answers

    What is the maximum continuous output current specified for the 110 V DC battery charging equipment?

    <p>82</p> Signup and view all the answers

    Which aspect of voltage control has a precision of ±5% in the 110 V DC system?

    <p>Current limiter precision</p> Signup and view all the answers

    How much is the total harmonic distortion specified for the AC supply output?

    <p>&lt; 10%</p> Signup and view all the answers

    What is the maximum voltage rise rate of the output voltage specified in the document?

    <p>&lt; 10 V/μs</p> Signup and view all the answers

    What condition must be met for the Auxiliary Converter Unit to automatically switch ON?

    <p>An activation signal is received from the train.</p> Signup and view all the answers

    What occurs when the voltage at the PWMI output is in the specified range?

    <p>The output fuses are closed.</p> Signup and view all the answers

    How does the charging process of lead acid batteries proceed after reaching a voltage of 110V?

    <p>Charging continues with a constant voltage as the current decreases.</p> Signup and view all the answers

    Which components are involved in feeding the DC input voltage to the PWMI modules?

    <p>The line choke, input fuses, and input diode.</p> Signup and view all the answers

    What is the maximum device current specified for the Auxiliary Converter Unit?

    <p>82A</p> Signup and view all the answers

    When does the Auxiliary Converter Unit switch OFF automatically?

    <p>When the activation signal is withdrawn.</p> Signup and view all the answers

    What type of characteristic does the load program correspond to for the battery charging?

    <p>IU-characteristic</p> Signup and view all the answers

    What happens immediately after both PWMI modules are switched ON?

    <p>The vehicle control receives a readiness message.</p> Signup and view all the answers

    What is the specified charging voltage when the battery current continues to decrease?

    <p>110V</p> Signup and view all the answers

    What is the primary application of the Pulse-width-modulated inverter modules in the Auxiliary converter?

    <p>To provide high DC link voltage operation</p> Signup and view all the answers

    Which component directly connects the output of the Pulse-width-modulated inverter modules to the system?

    <p>Main transformer</p> Signup and view all the answers

    How is the DC voltage for the Battery charger module in the Auxiliary Converter derived?

    <p>From the main Transformer via rectification</p> Signup and view all the answers

    What function does the sine filter resistor serve within the Auxiliary Converter unit?

    <p>To reduce electromagnetic interference</p> Signup and view all the answers

    What does the Battery charger module specifically cater to in the Auxiliary Converter?

    <p>Charing the train's battery from a 3-phase AC source</p> Signup and view all the answers

    Which part of the Auxiliary converter is responsible for temperature regulation?

    <p>Air intake temperature sensor</p> Signup and view all the answers

    What is a primary role of the decoupling diode in the Auxiliary converter system?

    <p>To prevent backflow of current</p> Signup and view all the answers

    What is the maximum short time voltage allowable in DC mode for input to the system?

    <p>2000 V</p> Signup and view all the answers

    What is the output voltage range for the AC mode operation of the Auxillary Converter?

    <p>1700 - 1800 V</p> Signup and view all the answers

    Which of the following describes the output frequency tolerance for the 415V AC output?

    <p>±1%</p> Signup and view all the answers

    What is the maximum permissible voltage rise rate for the AC output voltage?

    <p>&lt; 10 V/μs</p> Signup and view all the answers

    What is the ripple percentage specified for the DC input in DC mode?

    <p>4%</p> Signup and view all the answers

    What is the maximum dynamic tolerance of the output voltage for the 415V AC supply?

    <p>±15%</p> Signup and view all the answers

    What component is specifically used for output filtering in the AC supply?

    <p>Sinusoidal filter</p> Signup and view all the answers

    What is the nominal power output of the single-phase 110V AC supply?

    <p>20 kVA</p> Signup and view all the answers

    How much total harmonic distortion is allowed for the AC output in the system?

    <p>&lt; 10%</p> Signup and view all the answers

    What is the maximum unsymmetrical load permitted on the 87 kVA output?

    <p>10%</p> Signup and view all the answers

    What is the primary function of the M9000 CAN bus Communication card?

    <p>To facilitate communication between the Auxiliary converter and external devices</p> Signup and view all the answers

    What is the output configuration of the main transformer connected to the PWM inverter?

    <p>Two 3 phase primary windings and three secondary windings</p> Signup and view all the answers

    How does the Battery Charger filter choke function in relation to the AC-DC conversion?

    <p>It filters out AC components after rectification</p> Signup and view all the answers

    What is the role of the DC Line choke within the converter system?

    <p>To reduce ripple in the DC link voltage</p> Signup and view all the answers

    Which statement correctly describes the feedback system in the Auxiliary Converter?

    <p>It collects feedback signals for preventive action monitoring.</p> Signup and view all the answers

    What cooling function does the Main blower provide?

    <p>It cools the modules and transformer as well as the line choke.</p> Signup and view all the answers

    What type of voltage outputs does the main transformer provide?

    <p>One 3 phase 415 volts, one 110 volts, and one 500 volts</p> Signup and view all the answers

    In the context of ripple filtering, what is the significance of the DC Line choke?

    <p>It restricts high-frequency AC noise</p> Signup and view all the answers

    Which component is primarily responsible for fault detection within the Auxiliary Converter?

    <p>The M1300 SIBCOS Main controller</p> Signup and view all the answers

    Study Notes

    Auxiliary Converter Unit (ACU)

    • The ACU supplies power to the train's electrical systems, including the battery charger.
    • It's installed centrally in a motor coach of a three-part train.
    • Operates with a DC 1500V input.

    Installation Position

    • Each three-part train unit has one ACU.
    • Positioned in the high-tension compartment of the middle car (motor coach).

    Supply System

    • The ACU's input is connected to the traction link.
    • During AC operation, the ACU's input is the traction regulators.
    • During DC operation, the power source is the traction system's input filter.
    • The ACU creates a 3-phase AC 415V output, feeding rotary current drives (e.g., compressors).
    • It generates a 110V AC output for passenger compartment fans and lighting.
    • It provides a 110V DC output for battery charging and other devices.

    Component Layout

    • Diagrams show the placement of major converter unit components.
    • Includes pulse-width-modulated inverters and a battery charger.
    • Contains mounting plates and component locations within the cabinet.

    Functions of Major Components

    • PWMI Modules: Used for pulse-width modulation inverter operation. Connected to the transformer with series connections for high DC link voltages
    • Battery Charger Module: Charges the train's battery, receiving 3 phase AC power.
    • Master Controller: Oversees the ACU's operation, receiving feedback for fault detection.
    • CAN Bus Controller: Communicates between different parts, using a CAN bus network.
    • Line Filter Choke: Filters ripple in the DC link voltage fed to the PWMI modules.

    Cooling System

    • Forced-air cooled with a main fan and two internal fans.
    • Receives cooling air from the auxiliary operator console, which circulates through the modules and transformer.
    • Exits via a ventilation grate at the bottom of the cabinet.

    Electrical Data

    • Input DC 1500V:
      • Nominal input voltage: 1500V
      • Voltage range (stationary): 1000-1800V
      • Occasional maximum: 2000V
    • Three-Phase AC 415V 50Hz Output:
      • Frequency: 50Hz ±1%
      • Voltage: 415V AC, 3-phase
      • Static output voltage tolerance: ±5%
      • Dynamic output voltage tolerance: ±15%
    • Single Phase 110V AC 50Hz Output:
      • Frequency: 50Hz ±1%
      • Voltage: 110V AC, 1-phase
      • Static output voltage tolerance: ±10%

    DC 110V Output

    • Provides power for battery charging equipment; a backup for normal lighting and fan systems.
    • The DC 110V is generated through the main transformer, sinusoidal filter, EMV filter, and output fuses.

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    Description

    This quiz covers the key aspects of the Auxiliary Converter Unit (ACU) used in three-part trains. It includes the ACU's power supply functions, installation positions, and the various outputs it provides to support the train's electrical systems. Test your knowledge on the ACU's components and operational features.

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