Augusta Technical College ELT 118

The Electrical Trade
Instructors
Program Description
Equipment
MAT 101 General Mathematics
ELT 106 Electrical Prints
ELT 107 Commercial Wiring I
ELT 108 Commercial Wiring II
ELT 109 Commercial Wiring III
ELT 111 Single-Phase and Three-Phase Motors
ELT 112 Variable Speed/Low Voltage Controls
IFC 101 Direct Current Circuits I
SCT 100 Intro to Microcomputers

ELT 118

Course Description

Introduces line and low voltage switching circuits, manual and automatic controls and devices, and circuits. Emphasis will be placed on switching circuits, manual and automatic controls and devices, line and low voltage switching circuits, operation, application and ladder diagrams, AC and DC servo drives, and DC stepper drives. Topics include: ladder and wire diagrams, switching circuits, manual controls and devices, automatic controls and devices, and application and operation of controllers and controls.

Competency Areas	Hours
Ladder and Wire Diagrams	Class	3
Switching Circuits	D. Lab	2
Manual Controls and Devices	P. Lab/O.B.I.	3
Automatic Controls and Devices	Credit	5
Application and Operation of Controllers and Controls

Prerequisite:	None
Corequisite:	ELT 108, ELT 111, ELT 112

Course Guide

Competency	After completing this section, the student will:
Ladder and Wire Diagrams
Drawing the diagram	Describe the conventional procedures followed in drawing the diagram.
Two wire circuit	Draw a two-wire control circuit.
Three wire circuit	Draw a three-wire control circuit.
Switching Circuits
Two wire switching circuit	Connect and operate a motor and starter with a two wire switching circuit.
Three wire switching circuit	Connect and operate a motor and starter with a three wire switching circuit.
Low voltage switching circuit	Connect and operate a motor and starter on high voltage with low voltage switching circuit.
Manual Controls and Devices
Control circuit	Install a low-voltage, push-button control circuit for a three-phase AC motor.
Direction	Reverse direction of an AC motor.
Speed indicators	Install speed indicators.
Automatic Controls and Devices
Controls and devices	List control accessories available for use with magnetic starters. Electrically control a multi-speed motor. Calculate heater sizes for motor protection. Match NEMA starters to motors. Install and troubleshoot a run and safety circuit. Install a three-station control system for a motor and starter.
Application and Operation of Controllers and Controls
Controls and circuits	Install a control system for an AC motor. List methods of braking an AC motor. Install a dynamic braking system. Locate and identify problems in (troubleshoot) a control panel and circuit. Locate and identify problems in (troubleshoot) a controller.