VARIABLE FREQUENCY DRIVES (VFD)

COURSE CONTENT

VFD Safety Review

• Electrical Hazards

• Establishing an Electrically Safe Work Condition

• Personal Protective Equipment & Insulated Tools

Electrical Basics Review

• Multimeter, Clamp-On, Megohmmeter

• Single Phase and Three Phase Motors

• Motor Troubleshooting and Replacement

• Basic Control Circuits & Troubleshooting

What VFDs Do

• Motion Control / Motor Speed

• Air Flow / Liquid Flow / Pressure Control

• Eliminates the need for: 

  • Variable Transmission or Sheave

  • Variable Vanes or Dampers on Fans

  • Variable Valves on Pumps

Benefits of Using a VFD

• Energy Savings

• Easier Maintenance

• Enhanced System Monitoring

Load Types

• Constant Torque – Conveyors, Positive Displacement Pumps, Superchargers

• Variable Torque – Centrifugal Fans or Pumps, Saws, Routers, Planers

VFD Options

• Bypass – Two or Three Contactor Style, Disconnect Switch Style, Soft Starter

• Fusing – VFD or Bypass Protection

• Input / Output Reactors

• Motor Overload Device

• Transient Protection

• Auxiliary Relays

• Power Line Phase Reversal Detection

Installation of a VFD

• Environmental Concerns

• Clearances

• Conduit Entry

Customer Connections

• Safety Circuit

• Start / Stop

• Jog

• Status Indication

• Fault Indication

• Remote Speed Reference

• Monitoring of Motor Parameters