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Des Moines Area Community College Continuing Education
Course Information
Acronym/Number
Title
ELEM 575
ELECTRICAL MAINTENANCE
Credit Breakout
16.8
(CEUs
168
Contact Hours)
PREREQUISITE(S):
None
COURSE DESCRIPTION:
Learn about electrical safety concerns, with emphasis on lock out tag out procedures. Learn
basic electrical theory, voltage, amps, resistance, series and parallel circuits. Learn electrical
symbols and schematics, wiring and distribution. Use ladder diagrams and control devices to
implement practical control systems, relays, forward/reverse motors, photocells, reciprocating
tables, and other applications. Learn details of PLC hardware and modules. Become
familiar with other number systems utilized by PLC models and functions. Overview digital
logic gates and how to duplicate on a PLC. Discover guidelines for the installation,
maintenance, and troubleshooting of a PLC-controlled system.
COURSE OBJECTIVES:
At the completion of this course, the participant should be able to:
1.
Develop a working knowledge of hazardous situations and safety precautions.
1.1
Cite examples of hazardous situations.
1.2
Identify hazards associated with electricity.
1.3
Explain basic safety rules.
1.4
Describe safety equipment and personal protective equipment.
1.5
Discuss the basic procedures to aid an injured worker.
1.6
Recognize the basic tools used and the safety rules for using the tools.
1.7
Explain the functions of various electrical testing devices.
Acquire safety awareness.
1.1
Determine the correct fire extinguisher for class A, B or C fire.
1.2
Determine the proper use of trade hand tools.
1.3
Describe power tools and their use in the trade.
1.4
Lockout/tag out procedures?
1.5
Describe safety precautions when working with HV wiring.
1.6
Wire circuits with power off.
2.
Describe the fundamental concepts of electricity and electrical units.
2.1
Identify the structure of matter in an atom.
2.2
State the law of charges.
2.3
Identify different types of atoms and its structure.
2.4
Describe how electron force is applied to create current.
3.
Understand the characteristics of static electricity
3.1
Understand the principles of static electricity
3.2
State the basic benefits of static electricity
3.3
State the basic disadvantages of static electricity
4.
Batteries and other sources of electricity
4.1
Discuss the difference between primary and secondary cells
4.2
Understand what causes voltage differences between cells
4.3
Develop an understanding of the results of series and parallel connected cells
4.4
Understand solar cells
4.5
Understand thermocouples
4.6
Understand the piezoelectric effect
5.
Demonstrate an understanding of electrical prints, specifications, and codes.
5.1
Explain elementary drawings and detail drawings.
5.2
Identify the common electrical symbols.
5.3
Explain the importance of building codes.
5.4
Define the purpose, intent, and arrangement of the NEC.
Identification and description of: NEMA symbols.
2.1
Use NEMA symbols in all circuits developed.
2.2
Relate the symbols to the physical devices commonly used in motor control.
6.
Distinguish the characteristics of conductors and insulators.
6.1
Discuss the theory of voltage, current, resistance, and power.
6.2
Define a basic circuit.
6.3
Mathematical relationship of power, voltage, current, and resistance using Ohm’s Law.
6.4
List the factors of resistance.
6.5
Determine the value of various color coded resistors.
7.
Develop and illustrate the characteristics and relationships of a series resistive circuit.
7.1
Calculate the current flow in a series resistive circuit.
7.2
Calculate different voltage drops in a series resistive circuit.
7.3
Determine total resistance in a series resistive circuit.
7.4
Calculate the power in a series resistive circuit.
8.
Develop and illustrate the characteristics and relationships of a parallel resistive circuit.
8.1
Calculate the current flow in a parallel resistive circuit.
8.2
Calculate voltage in a parallel resistive circuit.
8.3
Determine total resistance in a parallel resistive circuit.
8.4
Calculate the power in a parallel resistive circuit.
9.
Develop an understanding of resistive combination circuits.
9.1
Distinguish a parallel branch from a series circuit.
9.2
Arrange and calculate series and parallel circuits into an equivalent circuit.
9.3
Calculate voltage, current, resistance, and power by using Ohm’s Law.
9.4
Explain Kirchhoff's voltage law.
9.5
Explain Kirchhoff's current law.
10.
Understand Inductance and its effect on an AC circuit
10.1 Determine how to calculate impedance
10.2 Understand and explain how impedance affects AC current flow
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11.
Describe the fundamental concepts of capacitance and capacitors.
11.1 Explain the definition of capacitance.
11.2 Explain the construction of a capacitor.
11.3 Discuss the difference between AC generators and DC generators.
11.4 Discuss the operation of a capacitor.
12.
Understand the purpose and use of filters
12.1 Discuss the necessity of filter circuits
12.2 Discuss the operation of low-pass filters
12.3 Discuss the operation of high-pass filters
12.4 Discuss the operation of band-pass filters
12.5 Discuss the operation of band-reject filters
13.
Conduction in liquids and gases
13.1 Explain how electricity is conducted in liquids and gases, which relies on IONS.
13.2 Explain the process of separating elements electrically
13.3 Understand what X-rays are and how they are used.
13.4 Define ionization potential
14.
Develop a basic understanding of service and distribution methods.
14.1 Describe two basic types of service and terminology.
14.2 Identify the required working clearances at the service equipment.
14.3 Define the purpose and uses of transformers.
14.4 Identify the components of a transformer.
14.5 Explain the different types of transformers and how they work.
14.6 Perform transformer calculations.
15.
Demonstrate the understanding of wiring methods and specific applications.
15.1 Recognize and understand commercial wiring methods and installation rules.
15.2 Size wire ways to code requirements.
15.3 Demonstrate and identify fittings, connectors, supports, and other hardware to particular
wiring methods.
15.4 Calculate wire sizing.
15.5 Identify different types of enclosures and their uses.
15.6 Explain how enclosures are grounded.
15.7 Identify various types of conduit bodies.
15.8 Calculate box fill.
15.9 Identify the types, ratings and characteristics of electrical protective devices.
Analyze power distribution systems and fundamentals.
6.1
Delta.
6.2
Wye.
6.3
Discuss over current protection.
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16. Develop and understanding of grounding.
16.1 State important grounding concepts.
16.2 Discuss the different characteristics grounded and un-grounded systems.
16.3 Identify the requirements for a service grounding system.
16.4 Explain the operation and the purpose of a grounded fault circuit interrupter
Understand motor control with aid of ladder/line diagrams.
3.1
Fabricate two and three wire control circuits.
3.2
Proper notation, descriptions, notation of ladder diagrams.
3.3
Relate the three basic sections of a ladder diagram.
3.4
Implement memory/latching circuits.
3.5
Implement relay logic (AND/OR/NAND/NOR) circuits.
3.6
Use interlocking and sequence control.
3.7
Select proper parameters in solenoid applications.
3.8
Describe shading coil induction motor, solenoids, contactors and coils.
3.9
Describe arch suppression.
3.10 Describe the advantages of joystick control.
17.
Develop a basic understanding of service and distribution methods.
17.1 Describe two basic types of service and terminology.
17.2 Identify the required working clearances at the service equipment.
17.3 Define the purpose and uses of transformers.
17.4 Identify the components of a transformer.
17.5 Explain the different types of transformers and how they work.
17.6 Perform transformer calculations.
18.
Develop an understanding of branch circuits and feeders.
18.1 Describe various types of branch circuits.
18.2 Define the functions of a feeder and the functions of a branch circuit conductor.
18.3 Size branch circuits and overcurrent protection required by code.
18.4 Use the code to size feeder conductors.
19.
Understand the principles of magnetism
19.1 Explain flux density
19.2 Explain reluctance
19.3 Understand the effect of changing the ampere turns of an electromagnet
19.4 Understand and explain the principle of the “left hand rule” as it pertains to electromagnets
20.
Develop an understanding of electromagnetic induction.
20.1 Explain the construction of an AC alternator (generator).
20.2 Discuss the four basic parts of an AC alternator (generator).
20.3 Discuss the operation of an AC alternator (generator).
20.4 Explain instantaneous, peak and effective voltage.
20.5 Discuss phase relationship.
20.6 Discuss inductive devices and other components.
21.
Demonstrate and understand motors.
21.1 Explain the concepts of motors.
21.2 Calculate motor starting currents.
21.3 Use the code to design motor branch circuits with overload protection.
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5. Explain motor types, operation, and related topics.
5.1
Induction and brush type.
5.2
Describe how the rotary magnetic field is developed.
5.3
Describe the shunt, series and compound motors.
5.4
Forward and reverse operation of three phase, single phase and brush type motors.
5.5
Reduced current starting.
1. Design circuits using timers to facilitate applications.
1.1 Draw timing charts.
1.2 Use pneumatic timers.
1.3 Use synchronous timers.
2. Understand motor control with aid of ladder/line diagrams.
2.1
2.2
2.3
2.4
2.5
2.6
2.7
Fabricate two and three wire control circuits.
Proper notation, descriptions, notation of ladder diagrams.
Relate the three basic sections of a ladder diagram.
Implement memory/latching circuits.
Implement relay logic (AND/OR/NAND/NOR) circuits.
Use interlocking and sequence control.
Select proper parameters in solenoid applications.
3. Explain motor types, operation, and related topics.
3.1
3.2
3.3
3.4
3.5
Induction and brush type.
Describe how the rotary magnetic field is developed.
Describe the shunt, series and compound motors.
Forward and reverse operation of three phase, single phase and brush type motors.
Reduced current starting.
4. Design and implement practical lab exercises.
4.1
4.2
4.3
4.4
4.5
4.6
Momentary control of control relays from one then two locations.
Fwd-rev control w/interlocking
Jogging
Garage door problems
Electronic keys.
Photocell applications
5. Analyze the following types of electrical components specifications.
5.1
5.2
5.3
5.4
5.5
5.6
5.7
Switchboards.
Panelboards.
M.C. Centers.
Busways.
NEMA enclosures.
Electrical load requirements for machinery and organizations.
Alternative conventions: IEC vs. NEMA.
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6. Design and implement practical lab exercises.
6.1 Momentary control of control relays from one then two locations.
6.2 Fwd-rev control w/interlocking
6.3 Jogging
6.4 Garage door problems
6.5 Electronic keys.
6.6 Photocell applications
6.7 Traffic Lights
6.8 A three floor elevator
6.9 Compelling sequence
6.10 Reciprocating table
6.11 Use a timer to implement 8.5
6.12 Use a timer to implement 8.7
6.13 Turn on a light for 3 sec., and off for 2 sec.
6.14 Construct and demonstrate the circuitry necessary to fwd-rev control a 240 volt three phase
motor circuit.
1. Explain the history and evolution of the programmable logic controller.
1.1
Review what a programmable logic controller (POLC) is and list its advantage over relay
systems
1.2
Review the main parts of a PLC and describe their functions
1.3
List the basic sequence of operation for a PLC
1.4
Review the general classifications of PLCs
2. Outline details of PLC hardware and modules.
2.1
List and describe the function of the hardware components used in PLC systems
2.2
Describe the basic circuitry and applications for discrete and analog I/O modules, and
interpret typical I/O and CPU specifications
2.3
Explain I/O addressing
2.4
Describe the general classes and types of PLC memory devices
2.5
List and describe the different types of PLC peripheral support devices available
3. Define number systems utilized by PLC models and functions.
3.1
Recognize the decimal, binary, octal, and hexadecimal numbering systems and be able to
convert from one numbering or coding system to another
3.2
Explain the BCD, Gray, and ASCII code systems
3.3
Define the terms bit, byte, word, least significant bit (LSB), and most significant bit (MSB)
as they apply to binary memory locations
3.4
Add, subtract, multiply, and divide binary numbers
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4. Duplicate digital logic gates on the PLC.
4.1
Describe the binary concept and functions of gates
4.2
Draw the logic symbol, construct a truth table, and state the Boolean equation for the AND,
OR, and NOT functions
4.3
Construct circuits from Boolean expressions and derive Boolean equations for given logic
circuits
4.4
Convert relay ladder schematics to ladder logic programs
4.5
Develop elementary programs based on logic gate functions
4.6
Program instructions that perform logical operations
5. Follow guidelines for the installation, maintenance, and troubleshooting of a PLC.
5.1
Outline and describe requirements for a PLC enclosure
5.2
Identify and describe noise reduction techniques
5.3
Describe proper grounding practices and preventive maintenance tasks associated with PLC
systems
5.4
List and describe specific PLC troubleshooting procedures
Preparation
Date: June 26, 2017
By: Darin Stevenson
Campus: Ankeny
Extension: 965-7322
Verified by:
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