Grounding HVAC Motor Shafts Protects Bearings, Lowers Repair Costs

Challenged to reduce energy consumption, facility managers are installing variable frequency drives (VFDs, also known as inverters) in heating, ventilation, and air conditioning (HVAC) systems. By allowing motors to run at less than full speed, these drives can yield energy savings of 20-30%, but they also induce currents that can damage bearings and shorten motor life. The resulting repair costs can wipe out any savings from their use. To make HVAC systems sustainable as well as energy-efficient, a reliable method of bearing protection is required.

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