Course 103

Introduction and Overview to Propulsion and Dynamic Braking

Module 4: Principles of Operation of Dynamic Braking

INSTRUCTOR GUIDE

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Table of Contents

CHECKLIST FOR INSTRUCTION ................................................................................................................................ 3

SUPPLIES, AUDIO-VISUAL EQUIPMENT, INTERNET ACCESS .................................................................................... 3

BEST PRACTICES FOR DELIVERING TRAINING ......................................................................................................... 4

OVERVIEW TO COURSE 103 ................................................................................................................................... 5

MATERIALS FOR INSTRUCTION .............................................................................................................................. 5

OVERVIEW TO MODULE 4 ...................................................................................................................................... 6

Order of Instruction for Module 4 ........................................................................................................................ 6 Demonstrations and Take-aways ......................................................................................................................... 6

OVERVIEW TO MODULE 4 ...................................................................................................................................... 7

Outline of PowerPoint Presentation ..................................................................................................................... 7 Learning Objectives for Module 4 ........................................................................................................................ 7

SLIDE-BY-SLIDE INSTRUCTION ................................................................................................................................ 8

Overview .............................................................................................................................................................. 8 Dynamic Braking ................................................................................................................................................ 13 Other Types of Braking Systems ......................................................................................................................... 16 Summary and Quiz ............................................................................................................................................. 19

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Overview to Course 103 Course 103: Introduction and Overview to Propulsion and Dynamic Braking provides participants with an overview of principles of maintenance of rail car propulsion and dynamic braking systems. This course is organized into five modules:

1. General Principles and Terminology 2. Principles of Operation of AC Propulsion 3. Principles of Operation of DC Propulsion 4. Principles of Operation of Dynamic Braking 5. Tools and Materials

Materials for Instruction Check that you have the following materials for instruction: Instructor Guide – each instructor gets one copy PowerPoint Presentation Participant Guide or Coursebook for each participant – each class participant gets

their own copy Module 2 Quiz – each participant gets one copy

Module 2 Quiz Answers – for Instructor

All materials can be downloaded from www.transittraining.net.

• Click on the Resource Library tab.

• In lower right under Useful & Helpful Links click on Courseware.

• Under Quick Links click on Rail Courseware.

• Click on Rail Vehicle Maintenance.

• Scroll down to Course 103: Introduction and Overview to Propulsion and Dynamic Braking.

• Follow relevant links to download files.

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Overview to Module 4 • Duration of this module: minutes • PowerPoint slides: 12 • This module has a quiz.

Outline of PowerPoint Presentation

Topic Title Slides Duration (Minutes) Overview 1-5 8

Dynamic Braking 6-8 8

Other Types of Braking Systems

9-11 14

Summary and Quiz 12-13 15 45 Minutes

Learning Objectives for Module 4

Following the completion of this module, the rail car technician should be able to: • Describe the theory of motor as a generator • Explain regenerative braking • Explain resistive braking • Explain dynamic braking • Summarize other types of braking systems on a rail car to include:

o Friction braking o Hydraulic or pneumatic disk brakes o Track brakes o Blended braking

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Slide-by-Slide Instruction Overview

Slide 1

Introduction and Overview to Propulsion and Dynamic Braking

Module 4Principles of Operation of Dynamic Braking

INSTRUCTIONAL ACTIVITY: This is the opening slide for Course 103 Module 4

TIME: 1 minute

SAY:Welcome to Module 4 of Course 103: Principles of Operation of Dynamic Braking. This module provides you with an overview of the principles of dynamic braking as part of the rail car's propulsion system.

DO: Leave this slide up until all participants are settled in the room.

PHOTOS: Rail cars representing in this slide are CATS (Charlottesville, NC), DART (Dallas, TX), SDMTS (San Diego, CA), VTA (San Jose, CA), BART (San Francisco Bay Area, CA), MBTA (Boston, MA)

ADVANCE SLIDE

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Slide 4

Introduction and Overview to Propulsion and Dynamic Braking

Key Terms• Rheostatic braking• Blended braking• Regenerative braking• Brake circuit

4

INSTRUCTIONAL EVENT: Present content.

TIME: 2 minutes

SAY: Here are some key terms that we will use in this module. Each of these terms is defined in your Participant Guide. Have a look at these terms. Turn to page 75 of your Participant Guide and circle those terms you are familiar with.

DO: Encourage participants to actively seek terms they may not completely understand or know about. Give participants time to read through the key terms and circle them. If time permits, ask participants to share some of the key terms they circled.

PARTICIPANT GUIDE PAGE REFERENCE: 75

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Dynamic Braking

Slide 6

Introduction and Overview to Propulsion and Dynamic Braking

Dynamic BrakingDynamic braking can produce electrical energy in two ways:

Regenerative braking: Returns power back to the source if the DC high voltage power source is receptive

Rheostatic braking: Returns power to brake grid resistors if the DC high voltage power source is not receptive.

6

INSTRUCTIONAL EVENT: Present content.

TIME: 2 minutes

SAY: Dynamic braking can produce electrical energy in two ways.

DO: Ask volunteers to read each bullet point for braking types as it is displayed.

PARTICIPANT GUIDE PAGE REFERENCE: 76

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Slide 8

Introduction and Overview to Propulsion and Dynamic Braking

Brake ResistorsBrake resistors are used to dissipate braking energy

when the line is not capable of absorbing excess energy.

8

Brake resistors are capable of absorbing the full braking load

continuously.

INSTRUCTIONAL EVENT: Present content.

TIME: 3 minutes

SAY: Brake resistors are used to dissipate braking energy when the line is not capable of absorbing excess energy.

DO: Call on students to read the capability of break resistors.

PARTICIPANT GUIDE PAGE REFERENCE: 78

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Other Types of Braking Systems

Slide 9

Introduction and Overview to Propulsion and Dynamic Braking

Other Brake SystemsDepending on railcar type, design and other requirements, rail vehicles are equipped with other types of brakes.Friction braking• Disc brake rotors, calipers, hydraulics/pneumatic and

proportional control valves are used to slow the train.Hydraulic or Pneumatic Disk Braking• Braking systems which use fluid or air as the force to

push blocks on to wheels or pads on to discs.Track brakes• Brakes with pushbutton on the operator's console.

9

INSTRUCTIONAL EVENT: Present content.

TIME: 2 minutes

SAY: Depending on railcar type, design and other requirements, rail vehicles are equipped with other types of brakes.

DO: Call on students to read the different components of the line input next to the picture.

PARTICIPANT GUIDE PAGE REFERENCE: 79

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Slide 10

Introduction and Overview to Propulsion and Dynamic Braking

Learning Application 4.1Break into small groups!

2

Compare Types of Brake Commands

5 minutes to discuss in group

Report back!

INSTRUCTIONAL EVENT: Provide learning activity.

TIME: 2 minutes

SAY: We’re going to do this exercise in small groups. [Allow participants to divide themselves in groups of 2 or 3]. Turn to page 81 in the Participant Guide. I’d like your group to take 5 minutes to discuss Question 1 in the exercise, then each group will give a report back to the entire classroom. In the mean time I am going to project the table on Page 81.

DO: Advance to next slide.

PARTICIPANT GUIDE PAGE REFERENCE: 81

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Slide 13

Introduction and Overview to Propulsion and Dynamic Braking

Quiz Time

5

INSTRUCTIONAL EVENT: Assess performance

TIME: 10 minutes

SAY: It's time to take a quiz.

DO: Provide quizzes to participants

PARTICIPANT GUIDE PAGE REFERENCE: N/A

OTHER: Quiz

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