IJM 2030 - Motor Controls

Clock Hours: 142

Delivery Mode
on-ground

Course Description:
“Relays, Contactors, and Motor Starters” provides an overview of the primary components involved in electric motor control. Relays are electrical switches that control a circuit. When activated by current, a relay opens and closes a circuit to turn a larger current on or off. Contactors control current by conducting it through metal contacts that make or break electrical circuits. When combined with an overload relay, a contactor becomes a motor starter.

Working with relays, contactors, and motor starters requires technicians to understand how to properly care for such devices and how to operate them effectively. After taking this class, users will be able to describe the design and function of common relays, contactors, and motor starters, as well as the applications for each device

Student Learning Outcomes:
Students will be able to:

Demonstrate knowledge of a manual motor starter by connecting power and a three phase motor to one in the lab for the instructor to observe.
Demonstrate an understanding of relays, contactors, and motor starters by connecting power to them to operate motors and lamps.
Demonstrate a knowledge of a control transformer by connecting one for use on 208/120 three phase to provide control voltage for motor control circuits
Demonstrate a knowledge of basic control circuits by connecting a start-stop push button control with memory. Use numerical cross referencing to label your schematic.
Demonstrate a knowledge of adding additional start and stop stations to basic control.
Demonstrate the proper wiring of forward-reverse magnetic motor starter control.
Demonstrate the knowledge of jogging by connecting three variations of jogging circuits to accomplish the task.
Demonstrate the use of ON and OFF delay timers by connecting them to control motors, control relays, contactors, and lamps.
Demonstrate knowledge of pilot devices including pressure switches, float switches, flow switches, limit switches, temperature sensing devices, hall effect sensors, proximity sensors, and photo detectors.
Demonstrate an ability to read and decipher large schematics.
Demonstrate a knowledge of 6 ways to start three phase motors, the operations of a DC motor, a single phase motor, and means of braking an electric motor.
Demonstrate the use of variable speed drives by programming and operating a variety of drives.
Demonstrate a knowledge of safety rules such as lock out-tag out, use of PPE, proper handling of fuses and circuit breakers, work in pairs when working on dangerous equipment, not working while tired or taking medication, and not working in dimly lit areas.
Demonstrate the use of a clamp on ammeter and multi-meter for determining the condition of the operation of a three phase motor.
Demonstrate the ability to analyze the operating condition of a single phase motor. Be able to check the capacitors for proper value and operation. Determine the defective elements in a single phase motor system that is malfunctioning.
Visually and electrically inspect a DC motor for defects. Demonstrate the knowledge of a series, shunt, and compound DC motor. Reverse a DC motor, adjust the speed, replace brushes, and service the commutator. Check for shorts and opens.
Demonstrate a knowledge of three phase motors. This includes construction, connections for different voltage levels, differences between wye and Delta motors, reversing directions, resistance checks to verify the condition of the windings, measurement of voltage and current, and corrective action to repair a defective circuit.
Use motor nameplate data to understand the operating parameters of a three phase motor. This includes power rating, voltage rating, code letters, operating base frequency, usage, service factor, speed, efficiency, and temperature ratings. Size a conduit to carry multiple conductors of different AWG size.
Select a proper motor for an installation. Power source, load, needed torque, torque horsepower conversions, environmental conditions, motor frames, motor enclosures, and motor efficiency considerations are analyzed. Analysis of cost versus efficiency is needed. Ambient temperature correction, voltage and frequency variations, altitude correction, motor starting time, and motor couplings are analyzed.
Select overcurrent protection devices, analyze fault currents, and develop motor starting protection. Use a multi-meter to troubleshoot fuses and circuit breakers. Student will size running motor protection and program running protection on a VFD.
Recognize phase and voltage unbalance, damage from single phasing, surge voltages, improper ventilation, overloads, overcycling, and moisture. Improper belt tension, misalignment, and vibration requires correction.