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Variable Frequency Drives
Description
Learn proper design recommendations to ensure that your equipment is as energy efficient and safe as possible. Discover the best practices for frequency drives in HVAC, pumping and facility applications. Approximately 50% of these systems are running in bypass which usually results in higher energy costs. Whether in facility maintenance, chilled water systems, waste water systems or manufacturing this course unlocks the secrets of VFDs to maintain your equipment. In hands-on lab exercises you will use scope meters to see how improper designs can lead to motor deterioration and other problems. You will also spend over 50% of the time programming and troubleshooting newly upgraded equipment that includes Allen-Bradley Powerful ex4 and ABB ACS-350 variable frequency flux vector drives.
Agenda [download course agenda]
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