Motors / Drives

VFDs with bypass option

Wed, 09 Jan 2013 21:50:00 +0000

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

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Enhancing Air-Cooled-Chiller Performance With VFDs

Wed, 01 Aug 2012 16:00:00 +0000

EDDIE RODRIGUEZ Daikin McQuay Minneapolis, Minn.

Variable-frequency drives help air-cooled systems overcome traditional efficiency drawbacks

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.

Choosing the Right NEMA Enclosure

Sun, 01 Jul 2012 16:00:00 +0000

JOE KOEPKE, Yaskawa America Inc., Waukegan, Ill.

Comparing NEMA 3R and NEMA 4X enclosures for outdoor VFD applications

Motors and Drives: Even the Best Relationships Have Issues

Sun, 01 Jul 2012 16:00:00 +0000

TOMMY TRULLINGER, Cerus Industrial Inc., Hillsboro, Ore.

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

Synchronous Belt Drives in Air-Handling Applications

Thu, 01 Dec 2011 17:00:00 +0000

WILLIAM TARR, Baldor Electric Co., Fort Smith, Ark.

Improvements have led to greater efficiency, lower static tension, less belt pull, reduced maintenance, and more

Ensuring Proper Fan-Belt Tension

Fri, 01 Jul 2011 16:00:00 +0000

BRIAN MLEZIVA, Greenheck Fan Corp., Schofield, Wis.

Correct fan-belt tension ensures proper system performance and long belt
and fan-motor life. Here are several effective ways to measure 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.

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

Fri, 01 Jul 2011 16:00:00 +0000

EDITED BY SCOTT ARNOLD, EXECUTIVE EDITOR

Units help earn measurement-and-verification points

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.

Energy Efficiency, the Environment, and VFDs

Sun, 01 May 2011 16:00:00 +0000

BILL GENAW, EATON CORP., MILWAUKEE, WIS

With advances in hardware and software, savings never have been greater

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).

2011 AHR Expo: Electro Static Technology on Shaft Grounding

Tue, 15 Feb 2011 20:07:00 +0000

Variable-Frequency Drive Improves Boiler Operation

Sat, 01 Jan 2011 17:00:00 +0000

JEFF EISENHAUER, University of Rochester, Rochester, N.Y., and DEAN WILLIAMS, EMA of NY Inc., Cortland, N.Y.

Reduces energy costs, maintenance, noise and vibration

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.