ELTR 1225 Syllabus

Subject Code

ELTR

Course Number

1225

Course Title

Industrial Controls I

Prerequisites

Provisional admission

Corequisites

Terms Offered

Credit Hours

Course Description

This course introduces manual and automatic controls, control devices, and control circuits. Topics include ladder and wire diagrams, control logic, mechanical input devices, electromechanical relays, contactors and magnetic starters, motor reversing methods, timing and counting functions, and motor stopping methods. Students gain practical experience in designing and wiring various motor control circuits.

Course Outcomes

Electrical Safety

List the basic electric motor safety rules.
Describe the different types of lockout-tagout devices.
Define "arc flash" and "arc blast" and how to minimize their effects.
State the three different classes of fires, specifically the electrical fire classification and how to extinguish such.
Define confined space and state work practices to prevent an accident in a confined space.
Explain the importance of working on or near overhead power lines.

Symbols and Diagrams

Identify the differences between pictorial drawings, wiring diagrams, schematic diagrams, line diagrams, block diagrams, and flow charts.
Identify the difference between the switch symbols for normally open, normally closed, normally open/held closed, and normally closed/held open.
State the five basic components of a basic electrical circuit.
Understand how to draw a circuit using symbols that illustrate the five basic components of an electrical circuit.
Explain how prints are read and how they are used during troubleshooting.

Control Logic

Understand the basic rules of line diagrams.
Understand the concepts of number references, numerical cross references, and wire reference numbers and how they differ.
Identify the components in an electrical control circuit as being a part of the signal, decision, or action section of a control circuit.
Understand the basic logic functions of AND, OR, NOT, NOR, and NAND.
Draw a basic motor control circuit with a three-wire START/STOP station.
Wire a basic motor control circuit with a three-wire START/STOP station.
Understand how to add indicator lights to a control circuit.
Troubleshoot a control circuit using a digital multimeter (DMM) to determine problems with the switches and/or loads of the circuit.

Mechanical Input Control Devices

Describe the different parts of pushbuttons and their functions.
Identify two-position and three-position selector switches.
Define joysticks and describe their most common positions.
Explain the purpose and uses of a limit switch.
Define deadband (differential) as applied to pressure and temperature switches.
Explain the purpose and use of a temperature switch.
Explain the purpose and use of a flow switch.
Explain the purpose and use of a level switch.
State the procedure for testing mechanical switch contacts using a DMM in an operational circuit.
Explain switch operation given a switch's truth table.

Solenoids

Define solenoid and state the function of each part used to produce linear motion in a solenoid.
List the different types of systems and applications solenoids may be used for.
State the number of positions, number of ways, and type of actuator a directional control valve has.
Describe the4 solenoid methods.

Electromechanical Relays

Explain the different types of electromechanical relays and their applications.
Define electromechanical relays (EMRs) and solid-state relays (SSRs) and how they function.
Explain machine control relay operation and applications.
Explain why relay contracts typically fail and how to help extend relay operating life.
Explain why some relays have a manual operating switch.
Wire a control circuit utilizing electromechanical relays.

Contactors and Magnetic Starters

Explain the difference between a manual starter and a manual contractor.
Explain how overload heater coils operate to automatically turn off an overloaded motor.
Describe magnetic contactors and explain how they are used.
Explain how to design a two-wire control circuit that can be used to control a magnetic contactor.
Wire a two-wire control circuit that can be used to control a magnetic contactor.
Explain how to design a three-wire control circuit that can be used to control a magnetic contactor.
Explain how to select the correct overload heater for a given motor using a manufacturer selection chart.
Define inherent motor protector and describe the different types.

Reversing Motors

Explain how to reverse three-phase motors.
Wire and reverse a three-phase motor.
Explain how to reverse single-phase motors.
Wire and reverse a single-phase motors.
Explain how to reverse DC motors.
Explain the difference between a magnetic reversing starter and a manual reversing starter.
Explain how auxiliary contact interlocking works.
Describe a power circuit and a control circuit.
Explain direct hardwiring.
Describe hardwiring using terminal strips.

Timing and Counting Functions

Describe the differences between how a dashpot timer, a synchronous clock timer, a solid-state timer, and a solid-state programmable timer produce a time delay.
Describe how an ON-delay timer operates and give an example of its usage.
Wire a control circuit utilizing ON-delay timer.
Describe how an OFF-delay timer operates and give an example of its usage.
Wire a control circuit utilizing OFF-delay timer.
Describe how a one-shot timer operates and give an example of its usage.
Describe how a recycle timer operates and give an example of its usage.
Explain the difference between supply voltage-controlled timers, contact-controlled timers, and sensor-controlled timers.
Define totalizer and counter.
Describe up counters and up/down counters.

Motor Stopping Methods

Describe friction brakes.
Define and describe plugging.
Define and describe electric braking.
Define and describe dynamic braking.