VFD

What’s New
Five Minute Facts
  • Motor Testing

Replace The Motor Or The VFD?

On start-up a fault code was received on a VFD operating an exhaust fan at a pharmaceutical manufacturing facility. Was it the motor or the VFD?

Webinars
  • Ultrasound

Overcoming VFD Condition Monitoring Challenges With Ultrasound

The prevalence of Variable Frequency Driven motors (VFDs) is on the rise and causing quite a concern for condition monitoring technicians. In this free webinar, you'll discover the role ultrasound plays in determining stage 1 and 2 bearing failures...

Five Minute Facts
  • Ultrasound

The Ultrasound Approach: VFD Drives and Condition Indicators

VFDs seem to be taking over the world; however, you may hear ultrasound inspectors complain they are having trouble interpreting data. Is there a simple assessment? Find out more in this short video…

Case Studies and Stories
  • Motor Testing

Energized Motor Testing Reveals Improper VFD Settings

This 55-kilowatt, 400-volt motor is controlled by a variable frequency drive (VFD). This motor drives the centrifugal fan that sends air into a natural gas combustion burner...

Case Studies and Stories
3 Minutes of Motor Testing
  • Motor Testing

What is 3 Minutes of Motor Testing Worth to You?

A motor distributor in the Netherlands provided a 17 Kilowatt, 400-Volt motor to a local hospital in 2015. The hospital rented a portable crane to install the motor onto the roof of the building. The motor is used to operate a fan that is mounted on the hospital’s roof...

Articles
  • Motor Testing

Vibration Measurement Techniques for Continuously Varying Speed Machinery

There are a lot of equipment types in industry that exhibit continuously varying speed. This presents a number of challenges to the vibration analyst. If a time sample is collected as the machine is continuously changing speed, the FFT will produce a virtually useless plot...

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