ATMN 140 - Industrial Motors and Controls
4 Credit: (1 lecture, 3 open-lab, 0 clinical) 4 Contact Hours: [ATMN 110 , or CSTC 100 , or ELEC 110, or (ELEC 111 and ELEC 112 )]
This course is for those who understand electrical basics and want to learn more about industrial motors and its controls. Included is a study of wiring symbols and diagrams, controls, relay ladder logic, and three-phase power. Motors are also introduced in this course. In addition, limit switches, proximity switches, and use of contactors, reversing contactors, overload protection and variable frequency drives are studied.
OFFERED: fall and spring semesters
Course Goals/ Objectives/ Competencies:
Goal 1: Demonstrate proper safety procedures.
- Explain necessary safety protocols using lockout, tag out procedures.
- Identify proper safety equipment. (Fuse pullers, meter probes, Pad locks).
- Demonstrate proper safety procedures in wiring low voltage control and power circuits.
Goal 2: Interpret analog relay ladder logic diagrams.
- Describe proper color codes for indicating wire usage.
- Describe proper labeling of wiring harnesses.
- Differentiate types of switches, normally open, normally closed, and automatic switches.
- Demonstrate proper wiring techniques (one load per rung, etc.).
Goal 3: Interpret wiring diagrams.
- Construct a correctly wired circuit from a wiring diagram.
- Distinguish between control and power circuits.
- Demonstrate a low voltage (110v) motor control circuit.
Goal 4: Create electrical connections between motors and controls.
- Use switches and relays to construct a three-wire motor control circuit.
- Design a motor control circuit to reverse a three-phase motor using a drum switch.
- Demonstrate proper use of heaters for motor overload protection.
- Rewire three-phase for motor for low or high voltage operation.
Goal 5: Troubleshoot motor circuits using electrical test instruments.
- Demonstrate proper procedure for determining blown fuses and other safety devices.
- Interpret motor characteristics such as RPM, torque, horsepower, and electrical requirements.
- Demonstrate proper procedure for identifying a failed motor and determining an appropriate replacement.
- Troubleshoot and correctly wire low voltage motor control circuits.
- Demonstrate the proper use of a voltmeter.
- Demonstrate the proper use of ammeters and amp clamps.
Goal 6: Demonstrate proper use of automatic input devices in relay ladder logic controls.
- Connect and operate various input devices including: Limit, pressure, float switches, etc.
- Demonstrate proper procedure for connecting H.O.A. (Hand-off-Automatic) control logic.
- Connect and operate a sequence control logic circuit.
- Design and Construct a sequence Control Circuit.
Goal 7: Demonstrate proper use timer control in relay ladder logic circuits.
- Connect and operate on-delay/off-delay relay ladder logic circuits.
- Design, connect, and operate a motor control circuit to perform time driven circuitry.
- Design, connect, and operate a motor control circuit to perform an unloaded start of a motor.
Goal 8: Demonstrate proper use of basic electrical sensors used in relay ladder logic controls.
- Compare and analyze the characteristics of capacitive vs inductive proximity switch performance.
- Connect and operate a relay ladder logic control circuit using an inductive proximity switch.
- Connect and operate a relay ladder logic control circuit using a capacitive proximity switch.
- Connect and operate a motor control circuit with a photo electric sensor.
- Design and construct a motor control circuit that will sense a product jam on a conveyor control system.
Goal 9: Explore the operation of variable frequency three phase motor drive (VFD).
- Connect and operate a three-phase motor using the front keypad of a VFD.
- Connect, program, and operate a VFD for three wire operation.
- Connect, program, and operate a VFD for two wire operation.
- Connect, program, and operate a VFD to jog a motor.
Goal 10: Explore the operation of variable frequency drive for speed and torque control.
- Control the speed of a three-phase motor using the front panel controls of a VFD.
- Program and operate a VFD to skip undesirable frequencies.
- Program and operate a VFD to operate a motor above and below its data plate listed RPM.
- Calculate volts per hertz ratio.
- Program and operate a VFD to provide a motor with low speed boost.
Goal 11: Explore the operation of variable frequency drive for Acceleration Deceleration and Braking.
- Program and operate a VFD to ramp a motor up to its rated speed.
- Program and operate a VFD to ramp a motor down from its rated speed to a stop.
- Program and operate a VFD to provide S curve acceleration to an induction motor.
- Program and operate a VFD to provide DC injection braking.
Goal 12: Create PLC and VFD electrical control wiring.
- Install a PLC and a VFD into an electrical enclosure.
- Wire and test power, control, and I/O wiring circuits in an electrical enclosure.
- Wire and operate a forward/reverse motor control system that uses PLC discrete I/O.
- Wire and operate a motor control system using VFD/PLC discrete I/O and interlocked motor control.
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