Ask Control Engineering
The Ask Control Engineering blog covers all aspects of automation, including motors, drives, sensors, motion control, machine control and embedded systems. Control Engineering answers questions from readers of Control Engineering's print and online magazines, newsletters and other publications. To comment on any blog posting, click on the post's highlighted question and scroll to the "Post a Comment" box at the bottom. Submit questions as comments to any existing post.
Dear Control Engineering: I’ve been investigating using fieldbus architecture for field device wiring in a process unit, and it has the potential to be a fairly large installation if we proceed. Given that this technology has been around for many years now, how broadly has it been used in high-device-count installations?
For electronics to make their way onto commercial airliners, extensive testing and failure modes must be determined before they are certified for flight. Is there a similar requirement for automobile fly by wire systems?
Dear Control Engineering: I’ve read that RTDs (resistance temperature detector) are often the most precise temperature sensing devices. Given the relatively narrow range of resistance involved, how is it practical to get precision with two, three, or more decimal places on a Celsius scale?
Bruce Konzak writes:Dear Control Engineering: Does a single phase 240 Vac induction motor have the same performance characteristics when powered by an autotransformer with a line to neutral feeder, as it does when powered normally by a line-to-line connection 120 degrees out of phase?