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