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
This case study shows some of the capabilities of motion amplification technology. This vertical treated water pump was experiencing high vibration, and high lateral motion in line with the suction and discharge piping at the top of the motor when running at around 72%. We decided to take some video footage...
- Andrew Gale
- Optical Motion Technologies
Originally put into operation in 1999, Pump Station P-19A supplies drinking water to the City of Henderson, which is the second largest city in Nevada. In January 2015, Motor 5 exhibited signs of overheating...
- Bill Kruger
- ALL-TEST Pro
This case involves a vertical cooling seawater pump in a power plant. The speed is 600 rpm, and it had no noise or operational issues. The current was normal, but they received…
- Ali Al-Shurafa
- Saudi Aramco
TransCanada Turbines Test Cell repairs and services gas turbines in a unique test facility. The turbines are used primarily for compression, power generation and marine applications. After repair and servicing, the Test Cell undertakes performance tests of the turbines...
- Grant Dennler
One of the most frequently quoted studies related to electric motor reliability is a 1983 Electric Power Research Institute (EPRI) project performed by General Electric...
- Howard Penrose
- MotorDoc LLC
Selecting the best accelerometer for a specific predictive maintenance application can be a daunting task – even for the most seasoned walk-around warrior…
- Meredith Christman
- PCB Piezotronics