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Operation and Adjusting Parameters of Variable Frequency Drives
Objectives

Outlines

 

Introduction: Motor-Drives System Design

  • Pros and cons of adjusting motor speed
  • Determine operating costs
  • Technological capabilities
  • Operational reliability
  • Application characteristics

Power Transmission, Relationship and Formulas

  • Affinity laws
  • Torque and horsepower/power factor
  • Electrical demand

AC Induction Motors

  • How a motor produces torque
  • Speed, pole, frequency relationship
  • Types of AC motors
  • NEMA designs
  • Motor enclosure types
  • Frame dimensions
  • NEC® and motor protection
  • Efficiency ratings

Motor Preventive Maintenance

  • Identify overloading
  • Loose connections
  • Phase/voltage unbalance
  • Single phasing
  • Environmental concerns
  • Megger testing
  • Effects of common mode voltage on bearings and fixes
  • Motor nameplate information
  • Drive fundamentals and electronics
  • Converter, DC bus, inverter
  • Pulse width modulation
  • Carrier and fundamental frequencies
  • Torque producing and magnetizing current
  • External operator control wiring
  • Analog control

Effect of Operating on Adjustable Frequency

  • Volts-to-hertz ratio
  • Constant voltage mode
  • Sensor less vector
  • Flux vector: open and closed loop

Troubleshooting Drives

  • Understanding fault codes
  • Clearing faults
  • Symptoms and corrective action

Drive Maintenance

  • Dry, clean, cool and tight
  • Isolation transformer/reactors
  • Operator interfaces
  • Proper selection and application for drives
  • Load matching
  • Bypass considerations
  • Facility operating problems
  • Variable torque operations
  • Fans and pumps
  • Payback/return on investment calculations

Hands-On Lab Exercises

  • Using a scope meter
  • Identifying voltage signals
  • Programming basic drive parameters
  • Drive control wiring and diagnostics
  • Troubleshooting using the keypad

Who Should Attend

Duration

5 Days

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