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Motors and Drives: Even the Best Relationships Have Issues

Intended to protect, VFDs can adversely affect motors. Here are tips for mitigating damage and prolonging motor life

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  • Jan. 9, 2013
    blog

    VFDs with bypass option

    The P-Series line of variable-frequency drives (VFDs) now features an energy-management-bypass option (EMB) that includes integrated power metering and a BACnet interface. The option ensures uninterruptible operation of HVAC systems, even if the drive is taken out of the loop, such as for reprogramming or maintenance operations. P-Series VFDs are available in a range of packages from 1 through 400 hp. —Cerus Industrial...More
  • Aug. 1, 2012
    article

    Enhancing Air-Cooled-Chiller Performance With VFDs

    Air-cooled chillers long have been the choice for system designers who are focused on simplicity and low cost. A system based on an air-cooled chiller usually is less expensive to install and easier to maintain than other types, such as water-cooled systems. On the other hand, these advantages typically have come at the expense of lower efficiency....More
  • Jul. 1, 2012
    article

    Choosing the Right NEMA Enclosure

    Comparing NEMA 3R and NEMA 4X enclosures for outdoor VFD applications...More
  • Jul. 1, 2012
    article

    Motors and Drives: Even the Best Relationships Have Issues

    Intended to protect, VFDs can adversely affect motors. Here are tips for mitigating damage and prolonging motor life...More
  • Dec. 1, 2011
    article

    Synchronous Belt Drives in Air-Handling Applications

    Improvements have led to greater efficiency, lower static tension, less belt pull, reduced maintenance, and more...More
  • Jul. 1, 2011
    article

    Ensuring Proper Fan-Belt Tension

    A properly tensioned belt ensures smooth operation and extends the service life of fans and motors. Conversely, an improperly tensioned belt can cause a host of easily preventable problems, including noise, vibration, poor fan performance, bearing wear, and shortened fan-motor life....More
  • Jul. 1, 2011
    article

    Highly Integrated Motor Starters Assist in Center’s Pursuit of LEED Certification

    In pursuit of Platinum certification under the U.S. Green Building Council’s Leadership in Energy and Environmental Design (LEED) green-building rating system, project manager Steve Young of controls and mechanical-design contractor American Heating specified measurement of the power consumption of each HVAC motor....More
  • May 1, 2011
    article

    Energy Efficiency, the Environment, and VFDs

    Strategically managing power can yield significant advantages—energy savings, improved sustainability, cost reductions. Among the technologies helping us to meet energy challenges while addressing efficiency and reliability concerns are variable-frequency drives (VFDs)....More
  • Feb. 15, 2011
    Video
    HPAC Engineering

    2011 AHR Expo: Electro Static Technology on Shaft Grounding

    ...More
  • Jan. 1, 2011
    article

    Variable-Frequency Drive Improves Boiler Operation

    At the University of Rochester in northwestern New York, a utility cogeneration plant provides electricity, steam, hot water, and chilled water to several internal customers, including the 154-acre, 158-building River Campus—the university's main center of learning—and the 750-bed Strong Memorial Hospital....More
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