Free Webinar

"The Future of Industrial Training: the New Digital Classroom"

About the Webinar:
At TPC Training Systems, we’ve been on the hunt for ways that our industrial skills training solutions can evolve to meet the needs of all of our customers, and we’ve learned some things in the process. In this webinar, we’ll share what we’ve learned and give you a preview of the future of industrial training.

You’ll learn about:
  • The best uses of webcast and simulcast training formats
  • The advantages of blended online and live training
  • Virtual reality (VR) training environments, including an exclusive sneak peek inside a VR simulation

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    DC Equipment and Controls

    DC Equipment and Controls

    Covers DC power applications in industry, types of DC generators, operating characteristics of DC motors, DC armature principles, and armature maintenance and repair. Includes types of DC relays, DC controllers, overspeed and overload protection, drum and reversing controllers, dynamic braking, DC power supplies, diodes, semiconductors, SCR principles, and DC maintenance practices. DC Equipment and Controls is available in online and course manual formats.

    TPC Training Systems is authorized by IACET to offer 1.0 CEUs for this program.

    Review a full course list for Electrical and Instrumentation Technician

    Select Format

    • Online Course & Test $85.00
    • Course Manual $71.00
    • Course Manual (Spanish) $71.00

    Please select a format.

    Lesson 1 - DC Power in Industry


    DC generators and motors; Rectifiers; SCR speed control; Storage batteries; Electroplating; Electrolytic refining; Arc welding

    Learning Objectives:
    – List the advantages of dc over ac.
    – List the brush problems caused by eddy currents.
    – Name three types of batteries commonly used in the plant.
    – Explain how the electroplating process works.
    – Explain the difference between straight polarity and reversed polarity in arc welding.

    Lesson 2 - DC Electromagnets


    Magnetic forces and fields; Magnetic shielding; Solenoids; Residual magnetism; Relays; Polarized relays; Protecting relay contacts

    Learning Objectives:
    – State the definition of residual magnetism.
    – Explain the effects of distance on magnetic field strength.
    – Discuss the characteristics and uses of solenoids.
    – Discuss the characteristics of relays.

    Lesson 3 - DC Generators


    Parts and action of DC generators; Armature reaction; Commutation; Interpoles; Types of generators; Losses; Parallel operation

    Learning Objectives:
    – Explain the function of each of the main parts of the dc generator.
    – Explain how to increase the number of pulses during each rotation of an armature.
    – Demonstrate how to combine the shunt field and series field to produce a compound generator.
    – State the reasons why electrical losses, magnetic losses, and mechanical losses occur in the dc generator.

    Lesson 4 - DC Motors


    CEMF; Armature reaction; Self-induction and commutation; Interpoles; Torque; Speed regulation; Shunt, series, and compound motors

    Learning Objectives:
    – Explain what happens during self-induction and commutation.
    – Define CEMF.
    – State the difference between speed regulation and speed control.
    – Name the kinds of dc motors.
    – Explain the different operating characteristics of series, shunt, and compound motors.

    Lesson 5 - DC Armatures


    Windings; Armature, copper, eddy-current, and hysteresis loss; Commutation; Armature maintenance

    Learning Objectives:
    – Name the basic parts of an armature assembly.
    – Describe the main differences between a lap winding and a wave winding.
    – List the characteristics of a single-reentrant simplex-lap winding.
    – State the definition of copper loss, eddy-current loss, and hysteresis loss.
    – Demonstrate how to perform preventive maintenance on an armature.

    Lesson 6 - DC Relays


    Operating characteristics; Shunt, series, lockout, and inductive time-delay relays; Magnetic blowout coils; Dynamic braking

    Learning Objectives:
    – Name three factors that determine the performance and reliability of a relay.
    – Name the six types of commonly used relays.
    – Explain the operation of each type of relay.
    – Explain dynamic braking.
    – Describe how a disc brake is attached to a motor.

    Lesson 7 - DC Controllers


    Classification; Factors affecting motor speed; Protection; Temperature compensation; Manual starters; Overload reset; Magnetic and drum controllers

    Learning Objectives:
    – List the kinds of functions performed by motor-control devices.
    – Name the types of motor controllers and discuss their operating characteristics.
    – Explain how each of the three kinds of thermal overload relays works.
    – Name the kinds of resets for overload relays.

    Lesson 8 - DC Power Supplies


    Electron emission; Electron tubes; Vacuum-tube diode and rectifier; Mercury-vapor diodes; Semiconductors; Checking diodes; Identifying replacement semiconductors

    Learning Objectives:
    – Discuss the operating principles of vacuum tubes and rectifiers
    – Name the four types of filters commonly used in rectifier circuits.
    – Identify a mercury-vapor diode.
    – List common causes of semiconductor failure.
    – State the criteria for selecting replacement semiconductors.

    Lesson 9 - Silicon Controlled Rectifiers


    Principles of SCRs; Pulse timing in DC circuits; Trigger pulses; SCR motor control; AC and DC applications; AC-DC conversion

    Learning Objectives:
    – State the definition of a silicon controlled rectifier.
    – Explain how an SCR works.
    – Explain how to increase the effective current and the power delivered to a motor by an SCR motor control.
    – List four dc applications of SCRs.
    – List four ac applications of SCRs.

    Lesson 10 - Maintenance of DC Equipment


    Inspection; Replacing field coils; DC motor controllers; Relay contacts; Commutation; Brush selection and care; Maintaining relays and armatures

    Learning Objectives:
    – Explain how to test field coils to determine the condition of the insulation.
    – List the signs of a short-circuited field coil in a machine.
    – Explain how to replace a field coil in a machine.
    – Discuss how to maintain relay control.
    – Name the criteria for satisfactory commutation.

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