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Variable Frequency Drives

Variable Frequency Drives

This Variable Frequency Drives course introduces students variable frequency drives and their applications in industrial plants and commercial buildings. Students learn how to improve VFD control and efficiency, troubleshoot and fix VFDs, reduce equipment downtime, and eliminate chronic VFD problems. Students who take this online course will learn to lower the cost of VFD operation.


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  • Online Video $85.00

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TPC Training Systems is authorized by IACET to offer 1.0 CEUs for Variable Frequency Drives online training.

Lesson 1: Basics for Understanding & Working with VFDs

Topics:

Variable Frequency Drives; Becoming a Better Qualified Person when Working on VFDs; What is a Variable Frequency Drive; Basics for Understanding and Working with VFDs; Understanding Loads; Types of Torque; Other Load Considerations; Typical VFD Applications

Learning Objectives:

– Describe how a VFD operates.
– Identify the components of a VFD.
– Recognize the various torque demands on a VFD.
– Name typical VFD applications.

Lesson 2: Motors for VFDs

Topics:

Basics of Motors; Induction Motor Rotation Basics; Three-Phase Motor Operation; Motor Speed and Number of Poles; Volts/Hz Ratio; Motor Nameplate Information; Recommended Maximum Insulation Temperature; The Inverter Duty Rated Motor

Learning Objectives:

– Explain the theory of AC motor operation.
– Understand the importance of Volts/Hz ratio.
– Describe the information on a motor nameplate.
– Recognize the importance of an inverter duty rated motor.

Lesson 3: VFD Data Input

Topics:

Programming a VFD

Learning Objectives:

– Identify the components on a VFD keypad.
– Enter Motor Nameplate Data into a VFD.
– View the VFD parameters on the keypad display.

Lesson 4: Measurement and Safety for VFDs

Topics:

Safety and VFDs; Test Equipment for VFDs; Making Safe Measurements

Learning Objectives:

– Identify OSHA safety standards.
– Use meters safely.
– Establish an electrical safe work condition.
– Choose the correct meter for troubleshooting VFDs.

Lesson 5: Hands-On Drive Exercises

Topics:

Drive External Accessories; Drive Exercises

Learning Objectives:

– Review a schematic diagram for external VFD accessories.
– Connect indicator lights to an internal drive relay.
– Connect inputs for various desired control functions.
– Check the fault code register to determine the history of faults.

Lesson 6: Electronics for VFDs

Topics:

3-Phase Rectification: The VFD “Front End”; Values Along the Sine Wave; The Diode Symbol; Checking Solid State Components in the Field; Full-Wave Bridge Rectifier; Ripple Voltage and Filtering; Types of Drives

Learning Objectives:

– Understand how an AC sine wave is generated.
– Explain the process of rectification.
– Identify semiconductor components.
– Describe pulse width modulation.
– Recognize basic drive types.

Lesson 7: Sizing and Selecting VFDs

Topics:

Steps for Selecting a VFD; Sizing and Selecting VFDs; Key VFD Specs; Special Considerations

Learning Objectives:

– Create an equipment profile.
– Prepare a detailed analysis of performance requirements.
– Research either machine or process equipment history.
– Identify environmental conditions.
– Analyze the power distribution system.

Lesson 8: Installation and Startup of VFDs

Topics:

Steps to Selecting a VFD; VFD Installation Requirements; Startup

Learning Objectives:

– Develop a checklist of items.
– Comply with manufacturer’s instructions and specifications.
– Identify with National Electrical Code® requirements.
– Verify proper overcurrent protection to drive.

 Lesson 9: Troubleshooting VFD Systems and Motors

Topics:

Troubleshooting 3 Phase Motors; Insulation Considerations for VFD Motors; Solutions Used to Prevent Motor Failures; Motor Bearing Issues for VFDs; Bearings; Resolving Bearing Problems; Troubleshooting VFDs; VFD Faults;

Learning Objectives:

– Troubleshoot three-phase motors.
– Identify motor failures.
– Discuss the six conditions needed to troubleshoot VFDs.
– Discuss a by-pass option.

Lesson 10: Preventative Maintenance

Topics:

Preventive Maintenance: NETA Recommendations

Learning Objectives:

– Conduct a visual and mechanical inspection of the VFD.
– Perform electrical testing.
– Test the equipment grounding path.