Standard

 

ELT 118 - Electrical Controls

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:

ELT 111, ELT 112

Corequisite:

 

 

Course Guide

 

Competency

After completing this section, the student will:

Hours

Class

D. Lab

P. Lab/

O.B.I.

LADDER AND WIRE DIAGRAMS

2

2

3

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

3

2

3

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

5

4

6

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

10

6

9

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       

10

6

9

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.

 

 

 

 

Suggested Resources

 

Books

 

Adams, J., & Rockmaker, G. (1985). Industrial electricity: Principles and practices (3rd ed.). New York: McGraw-Hill.

Baitch, T. (1984). Electrical technology. New York: John Wiley & Sons.

Court, M. (1988). Lab manual for first course in electrical technology. New York: John Wiley & Sons.

Hughes, E. (1987). Electrical technology (6th ed.). New York: John Wiley & Sons.

Langley, B. C. (1985). Plant maintenance. Reston, VA: Reston.

Office of Personnel Management. (1988). Industrial equipment mechanic. Syosset, NY: Natl Learning.

Schram, P. J., & Murray, R. H. (1987). The national electrical code (4th ed.). Quincy, MA: National Fire Protection Association.