Despite the appearance of digital fieldbus technology in plants, well-proven HART technology still has a viable long-term role, notes Ed Ladd of the HART Communication Foundation. He adds that industry consultants predict that HART easily will be supported and remain a significant communications technology for the next 20+ years.
Author: Ed T. Ladd, Jr., HART Communication Foundation, Austin, Texas
ABB designed software for its ACS800 drive so Curtis-Toledo could improve the operation of its rotary-screw compressors. The customized software can control the system pressure, air delivery, oil temperature and duty cycle directly from the drive.
Sound purchasing decisions depend upon properly soliticiting and evaluating proposals from various vendors. This article will help you assemble a request for a proposal that should lead to responses that meet your needs and that you can compare.
Author: John G. Kunesh, consultant, and Raymond M. Sowiak, Sunoco
The constant-speed approach to AC motors made a lot of sense when energy was cheap and drives technology was in its infancy. With their latest advances, adjustable speed drives can provide one of the best energy efficiency options for a plant.