Variable frequency drives (VFDs) have become a preferred method of process control for electric motor driven equipment ranging from vertical water pumps to centrifugal air fans. The following is a basic discussion of risks of using a VFD with direct driven centrifugal fans and methods of mitigating those risks to maintain equipment reliability.
- David Sheffler
- IVC Technologies
Within the vibration community, it is commonly accepted to describe a spalling process in a bearing in four stages; from the first microscopic sign to a severely damaged bearing...
- Ron Kittle
- SPM Instrument Inc