ETT Study Guide Book 3: Component Testing
Q. Adjustable-Speed Drive Systems
1. Properties and Types
Identify properties, types, and applications 2, 3, 4
- How to select a VFD 4
- The Basics of Variable-Frequency Drives 2
- The Basics of AC Drives
- Why do we need variable speed drives (VSD)?
- Comparison of motor speed control methods
- Adjustable Speed Drives Tutorial
- AC Adjustable Speed Drive (ASD) – An Overview
- Benefits and Potential Drawbacks of VSDs
- Variable speed drives in pumping applications
- Adjustable speed drive motor protection applications and issues
2. Inspection and Test Procedures
Apply visual and mechanical inspections 3, 4
- NFPA 70 2017: Article 430 Part X Adjustable-Speed Drive Systems 2 3 4
- Motor Selection for Adjustable-Speed Drives
Employ methods and procedures for electrical tests 3, 4
- NFPA 70B: Chapter 11.22 Adjustable Speed Drive Testing 2 3 4
- Why do variable speed drives fail and how do we test them?
- Testing Large Adjustable Speed Drive Systems
3. Interpretation of Test Results
Evaluate results of electrical tests 3, 4
- NETA-ATS 2017: Section 17 Adjustable-Speed Drive Systems 2 3 4
- NETA-MTS 2019: Section 17 Adjustable-Speed Drive Systems 2 3 4
- Effects of AC Drives on Motor Insulation
Last Update: Aug 21, 2023
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Guide Table of Contents, Book 3
- Book 3 Overview
- A. Switchgear and Switchboard Assemblies
- B. Transformers
- C. Cables
- D. Metal-Enclosed Busways
- E. Switches
- F. Circuit Breakers
- G. Circuit Switchers
- H. Network Protectors
- I. Protective Relays
- J. Instrument Transformers
- K. Metering Devices
- L. Regulating Apparatus
- M. Grounding Systems
- N. Ground-Fault Protection Systems
- O. Rotating Machinery
- P. Motor Control Centers and Motor Starters
- Q. Adjustable-Speed Drive Systems
- R. Direct-Current Systems
- S. Surge Arresters
- T. Capacitors and Reactors
- U. Outdoor Bus Structures
- V. Emergency Systems
- W. Automatic Circuit Reclosers and Line Sectionalizers
- X. Fiber-Optic Cables
- Y. Insulating Liquids and Gases
- Z. Fuses
- AA. Electric Vehicle Charging Systems