VFDs Variable Frequency Drives Training
Operation, Maintenance & Efficiency
2 DAY ON-SITE
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Class Description:
This hands-on training is designed for facility and plant maintenance technicians, who need a better understanding of how to apply, maintain and optimize VFDs. The training features an overview of VFD applications, VFD energy efficiencies, maintenance, troubleshooting and safety.
Purpose of Training:
From appliances, HVAC systems to large manufacturing equipment, VFDs (Variable Frequency Drives) are a critical and growing component of electrical distribution systems, yet they are often misunderstood. Proper application, maintenance and troubleshooting of VFDs can help plants and facilities reduce electrical consumption, reduce downtime, and improve efficiencies.
The training features an overview of VFD applications, VFD energy efficiencies, maintenance, troubleshooting, and safety.
Upon completion of this course, students will be able to properly manage and maintain their VFDs in a safe and efficient manner.
Course Agenda
Day 1
I. VFDs and Electrical Safety
• Electrical Hazards Review
• PPE & Tools
• Lockout / Tagout
• Stored Energy
II. Basic Electricity Review
• Using Mulitmeters, Clamp-Ons, Megohmmeters
• Single Phase and Three Phase Motors
• Motor Troubleshooting and Replacement
• Basic Control Circuits & Troubleshooting
III. VFD Applications & Benefits
• AC Motor Speed
• Motion Control
• Air / Liquid / Pressure Flow Control
• Energy Efficiency and VFDs
• Elimination of additional control devices
• System Monitoring and Feedback
IV. VFD Components
• Frame, Capacitors & Line Inductors
• Diodes
• SCRs
• Power Transistors
• Insulated Gate Bipolar Transistors
V. VFD Options
• Fusing – VFD or Bypass Protection
• Bypass – 2 & 3 Contactor Style, Disconnect Switch Style, Soft Starter
• Input / Output Reactors
• Motor Overload Device
• Transient Protection
• Auxiliary Relays
• Power Line Phase Reversal Detection
Day 2
VI. Installation of a VFD
• Nameplate Data & Ratings
• Enclosures
• Heat Dissipation & Clearances
• Grounding
• Conduit Entry
VII. Customer Connections
• Safety Circuit
• Start / Stop
• Jog
• Status Indication
• Fault Indication
• Remote Speed Reference
• Monitoring of Motor Parameters
VIII. Wiring & Grounding
• Induced Signals
• Inductive, Capacitive
• Incoming Power (line) Wiring
• Motor (load) Wiring
• Control Wiring
• Proper Grounding Methods
IX. VFD Controls
• Keypad Controls
• Terminal Strip Control – Automatic, Manual
• Bus Communication Control
• Open Loop Control
• Manual Operation
• Automatic Operation
• Sensorless Flux Vector
• Closed Loop Control
• PI Loop Configuration
• Sensor or Transducer Feedback
• Motor Shaft Encoder Feedback
X. VFDs Menus & Displays
• Graphic Menus & Display Menus
• Menu Levels
• Factory Defaults
• Control Modes
• Open Loop, Closed Loop
• Motor Data
• Power (kW) and RPM
• Voltage, FLA Current
• Service Factor, Power Factor
• References & Limits
• Motor Speeds – Min, Max, and Preset
• Ramp Times
• Speed Reference
• Skip Frequencies
• Limits for Alarms or Faults
• Inputs / Outputs – Analog, Digital, and Relay
• Application Functions
• Reset
• Flying Start
• Sleep Mode
• Switching Frequency
• No Load
• Phase Loss
• Closed Loop Functions
• Normal / Inverse
• Anti Windup
• Start-up Frequency
• Integral Time / Differential Time
• Proportional Gain / Differential Gain
• Lowpass Filter
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