| The VFD presentation will cover the following areas: |
| 1. |
Brief review of common types of three phase motors and their components |
| 2. |
Three phase motor torque characteristics |
| 3. |
Discussion of constant and variable torque motor loads, typical applications, and the relationship of motor torque to current frequency |
| 4. |
Review of typical and optional VFD components when applied in HVAC systems |
| 5. |
Definition of pulse width modulation and explanation of the relationship between pulse width and motor speed |
| 6. |
Definition of harmonics, the relationship of VFD's and harmonics and the design requirements needed to avoid harmonic induced power distribution problems |
| 7. |
Common VFD applications concerns |
