While both belt and direct drive fans have been around for a long time, the mainstay fan for most industrial fan applications under 250 hp has been the belt drive fan.

Today’s data centers handle an increasing volume of global digital communication traffic compared to their predecessors of yesteryear. The computers and digital devices that provide streaming video, Internet of Things (IoT) data, business communications, etc. are driving the growth of new data centers to handle this traffic.

Since as early as the 1990s, there have been questions, discussions, and application notes on the topic of using a 2-contactor bypass or 3-contactor bypass with variable frequency drive (VFD) configurations.

Variable frequency drives (VFDs) save energy, increase the life of mechanical systems, and offer valuable control features in a wide range of building management applications.

Baylor University, a private college in Waco, TX, had a typical chiller plant — it ran well, but it was also a hodgepodge of equipment.

What are engineers making time to read?

Voltage spikes, bearing or winding failure, capacitance/insulation issues... you may have one of these problems to solve (or better, to avoid) in order to enjoy the full benefits of your drive.

The Royal University Hospital (RUH) provides acute-care services for the Saskatoon, Saskatchewan region, serving as the main trauma center for the entire region and housing many maternal and child, neurosurgery, and cardiovascular surgery services.

Chillers have always been a popular choice to air condition large commercial buildings that are, by their nature, energy intensive.

This is the second half of a two-part article discussing principles and application of the AC induction motors that provide motive power for most of the equipment HVACR engineers specify.