Engineering and Maintenance
Electric Motors and Variable Speed Drives: Selection, Applications, Operation, Diagnostic Testing, Protection, Control, Troubleshooting and Maintenance

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Electric Motors and Variable Speed Drives: Selection, Applications, Operation, Diagnostic Testing, Protection, Control, Troubleshooting and Maintenance Course
Introduction:
Course Objectives:
By the end of this course, participants will be able to:
- Demonstrate a sound understanding of how AC Variable Speed Drives (VSD's) work
- Install VSDs properly
- Select the right VSD for a given application
- Troubleshoot VSDs competently
- Competently explain how flux-vector control works for drive applications
- Understand squirrel cage induction motors
- Identify the protection and control system requirements for VSD's
- Interface VSD’s with PLCs
- Understand the causes of motor burnout
- Deal effectively with VSD harmonics and EMC/EMI problems
Who Should Attend?
This course is intended for all Instrumentation, Control, Electrical/Electronic Engineers and Technicians, Maintenance Personnel, Plant Technical Staff, and Supervisors.
Course Outlines:
Introduction
- Induction Motors
- Characteristics of squirrel-cage motors
- Stator construction
- Rotor construction
- Air gap
- Operating features
- Standard motor
- Torque
Maintaining Three-Phase Motors
- Maintenance requirements
- Cleaning motors
- Care of stator windings
- Care of rotor
- Overload and single-phase operation problems
- Motor shaft currents
- Induction motor bearings
- Bearing temperatures
- Lubrication and bearing
- Ball bearings
- Sleeve bearings
- Heating of bearings
- Vibration
- Surrounding factors
Machine Disassembly and Reassembly
- Replacing ball bearing
- Rotor removing
- Preparation
- Lifting rotor
- Pulling out rotor
- Inserting rotor
Electrical Testing
- Recommended field insulation test
- AC high potential
- AC megger
- DC high potential
- Measurements of temperature rise
- Thermometer
- Resistance
- Thermocouple
Troubleshooting Electric Motors
- Locating the motor as the problem as quickly as possible
- Determining the reason, the motor failed
- Excessive mechanical load
- Low or high line voltage
- Unbalanced voltages
- Single-phasing
- Excessive duty cycle
- High ambient temperature
- Insufficient ventilation