Charging Systems & Control Circuits Part 1

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Charging Systems & Control Circuits Part 1
2015-03-25 01:56:59
Service Procedures Testing Diagnosis

Charging Systems, Diagnosis, Procedures & Service.
Show Answers:

  1. Charging System - what is it's purpose ?
    to provide the electrical power required to operate the vehicle electrical components and to recharge the battery whenever necessary.
  2. Charging Systems converts _______ energy into _______ energy ?
    Mechanical Energy into Electrical Energy.
  3. What are the 2 Stator types ?
    Y-Wound Stators & Delta-Wound Stators
  4. Y-Wound Stators - name 3 points
    • has a neutral junction 
    • two windings always form a series circuit between a positive & a negative diode. 
    • Y-Wound Stators produce more voltage at lower generator speeds.
  5. Delta-Wound Stators - name 3 points
    • has NO neutral junction 
    • the windings always form 2 parallel circuit paths between a positive and 2 negative diodes 
    • have greater current output a higher speeds but do not deliver as much current at lower speeds
  6. Brushes ride __________.
    on the surface of the slip rings.
  7. What is a Sine Wave ?
    distinctive wave form of AC voltage produced by a passing a magnet past a conductor.
  8. A cycle ?
    is one complete sine wave - when referring to an AC voltage event.
  9. Frequency ? 2 - Points
    • Measured in Hertz (Hz) events in one second 
    • measurement of how many times an event occurs in a fixed time frame.
  10. Alternating Current in a generator is rectified by:
  11. The component that is turned by the generator drive belt and creates a rotating magnetic field is the:
  12. Automotive generators w/ 3 stator windings generally us _______ diodes to rectify the output current.
  13. Generator brushes ride on _____ to feed current to the rotors windings.
    Slip Rings.
  14. The regulator in a charging system device that controls:
    Voltage levels in the charging systems.
  15. Generator output is directly related to:
    field strength & rotor speed.
  16. Voltage Regulators (purpose)
    limit voltage produced by a generator by controlling the field current in the generator rotor winding.
  17. Most Voltage Regulators operate in the range of:
    13.0V - 15.5V
  18. What is the purpose of the Generator Output Test ?
    is to determine whether the generator is capable of delivering its specified current output.
  19. Charging Systems test are performed using: (3 answers)
    • a multimeter 
    • an oscilloscope 
    • a load tester
  20. A voltage drop of more than ____ indicates high resistance in ground wiring of the charging systems.
  21. Positive Circuit Voltage Drop Connections - where do you hook up the leads hombre ?
    Connect the Voltmeter's positive lead to the generator output terminal and the voltmeter's negative lead to the positive battery terminal.
  22. Ground Circuit Voltage Drop Connections - How are the leads hook'd up ? Hombre ?
    connect the voltmeter's negative lead to the generator housing and the voltmeter's positive lead to the negative battery terminal.
  23. If the generator drive belt tension is adjusted too tightly: (2 answers)
    • the belt will wear out prematurely 
    • the generator pulley and bearings can be damaged.
  24. A generator drive belt in poor condition and not tensioned properly will result in an:
    • an undercharge battery 
    • a squealing noise after the engine is started
  25. Duty Cycle
    Duty cycle is a measurement of % of a cycle that current is flowing (on time)
  26. What should be the first step - beginning with any electrical system repairs ?
    Disconnect the negative battery.
  27. Windings that are dark & burnt are an indication of a ________ ? (Rotor Checks)
    short rotor winding.
  28. Continuity Test ? (2 points)
    • Check resistance across the slip rings using an ohmmeter.  
    • Resistance should be between 1.5 to 4.0 ohms at room temperature 
  29. How to check Rotor for a Short-To-Ground
    place the ohmmeter leads between the slip rings and rotor shafts. You should have an infinite reading - indicating no continuity to ground.
  30. Stator Continuity Test
    • Using a digital ohmmeter, test for continuity between each pair of stator leads.
    • maximum resistance should be less than 0.5 ohms
  31. How to test for Opens & Internal Shorts on Delta Windings ?
    Due to the design of Delta-Wound stators, they cannot be checked for opens & internal shorts.
  32. Stator Ground Tests
    • Using a ohmmeter to check the resistance between a stator lead and the stator frame. 
    • Ohmmeter should read infinite.
  33. When checking rectifier diode
    One side will be open & one side will have a resistance reading.
  34. Internal Voltage Regulator
    A-Type, its powered all the time & regulates on the ground side (PCM or Case Ground)
  35. External Voltage Regulator
    B-Type, its grounded all the time & regulated on the power side.
  36. Semiconductors - definition
    can conduct or block electrical current.
  37. Diodes
    allow current to flow through them in one direction.

    one way check valve
  38. Capacitors
    • hav the ability to absorb & store electrical charges and then release it into the circuit
    • are used for electrical noise and voltage spike suppression.
  39. Rectification
    Since a diode will allow current to flow in one direction and not the other, it can be used to turn AC to DC.
  40. Zener Diode
    • Allows current to flow in reveres bias at a specific voltage without damage.
    • allows reverse current flow above a set reverse voltage.
  41. Anode
  42. Cathode
  43. NPN
    Not Pointing in
  44. PNP
    Pointing IN
  45. Transistors
    Acts as an electrical switch in a circuit.
  46. The maximum current output of an alternator is regulated by:
    the design of the stator winding.