ELM 4040 - Control of Industrial Motors

Clock Hours: 150

Delivery Mode
on-ground

Prerequisites: Maintenance Associate Diploma

Course Description:
This course has been prepared to give the student a thorough understanding of the theory and operation of electric motor controllers. Starting with fundamentals, it proceeds step by step, through all the basic kinds of controls the student will encounter in industry. It explains what kind of controls are available, how they will operate, where they are used, and why they are designed to operate as they do. Control systems for electric motors are vital to the proper performance and protection of modern equipment, and they are the essential link in every complex industrial process. These systems may range from the simple starting and stopping of an electric motor to directing the energy flow in a completely automated facility.

Student Learning Outcomes:
Continuity Tests-Buzzer and

To use the tester to check for circuit continuity, opens and short.
To identify the normally-open/normally closed contacts of relays, toggle switches and pushbuttons.
To determine whether contacts are of the make-before-break or break-before-make type.

Two-Station and Three-Station Control

To construct a two-station control using three-way switches.
To construct a three-station control using three and four-way switches.
To become familiar with wiring and schematic diagrams.

Control Diagrams-Schematic & Connection

To use the schematic diagram in analyzing control circuit function.
To use the wiring diagram for component and terminal identification.

Electromagnetic Contactors and Relays

To determine the pull-in, drop-out properties of the electro-magnetic contactor.
To measure the operating speed of the electro-magnetic contactor.
To determine the pull-in, drop-out properties of the time delay relay.
To measure the time delay.

Full-Voltage Control of a 3Ø Induction Motor

To construct a 3phase across-the-line magnetic starter.
To determine the tripping time vs. overload for the thermal relay.
To control a 3phase motor from two stations.

Delayed Start of a 3Ø Induction Motor

To perform various timing operations using the time delay relay.
To construct a delayed start 3phase magnetic starter.
To use the inertia wheel to represent a high inertia starting load.

Start-Stop-Jog of a 3Ø Induction Motor

To construct a start-stop-jog control circuit with a transfer switch interlock.
To construct a start-stop-jog control circuit that must have its stop button actuated prior to jogging.
To construct start-stop-instant jog control circuits.

Definite-Time Jogging and the Magnetic Brake

To construct jogging circuits with precise inching control.
To become familiar with the electro-magnetic brake.
To construct a jogging control circuit incorporating the magnetic brake.
To compare the ac and dc operating characteristics of the magnetic brake.

Forward-Reverse Control of a 3Ø Induction Motor

To construct a 3phase reversing starter with a mechanical interlock.
To construct a 3phase reversing starter with an electrical interlock.
To construct a 3phase reversing starter with mechanical and double electrical interlocks.
To construct a 3phase instant reversing starter.

Primary Resistor Starting of a 3Ø Induction Motor

To realize the advantages of reduced-voltage starting
To construct a reduced-voltage starter using primary resistors.
To determine the torque per ampere characteristics of a primary-resistor starter.

Autotransformer Starting of a 3Ø Induction Motor

To construct a reduced-voltage starter using autotransformers.
To determine the torque per ampere characteristics of an autotransformer starter.
To compare the autotransformer starter with the primary-resistor starter.

Wye-Delta Starting of a 3Ø Induction Motor

To learn the principle of wye-delta starting.
To construct a wye-delta starter.
To compare the characteristics of the wye-delta starter with primary-resistor and auto-transformer starters.

Unbalanced Starting of a 3Ø Induction Motor

To learn the principle of unbalanced starting of a 3-phase motor.
To construct an unbalanced 3 phase starter.
To observe the operating characteristics of a 3-phase motor when it becomes single-phased.

Starting a 3Ø Wound Rotor Induction Motor

To learn the principle of starting wound-rotor motors using external rotor resistors.
To construct a magnetic starter with speed control.
To introduce hoisting controls.

Cam-Switch and Drum-Switch Controls

To interpret cam-switch circuit diagrams.
To use a cam-switch to control a wound-rotor motor.
To use a cam-switch to control hoist-forced lower operation of a wound-rotor motor.

Plugging of 3Ø Induction Motor

To learn the reasons for plugging a 3-phase motor.
To construct a 3-phase magnetic starter using plug-stop control.
To construct a 3-phase magnetic reversing starter using plug-stop control.

Direct Current Contactors and Relays

To measure the pull-in, drop-out properties of electro-magnetic contactors and relays when operated on dc.
To compare the ac and dc operating characteristics of contactors and relays.
To evaluate the performance of various arc suppression circuits.

CEMF Starting of a DC Moto

To learn the principles of the CEMF motor starter.
To construct a dc CEMF electro-magnetic motor starter.
To add dynamic braking to a magnetic motor starter.

Cam-Switch “Hoist-Lower” Control of a DC Motor

To learn the principles of “hoist-lower” control of a dc motor.
To construct a “hoist-lower” control circuit incorporating both dynamic and magnetic braking.

Starting Split-Phase and Capacitor Start Motors

To learn the starting properties of resistance split-phase and capacitor-start motors.
To construct and evaluate the performance of control circuits for split-phase and capacitor-start motors when coupled to high inertia loads.