A novel power and communications hub: the GMT EtherCAT and power hub

John M. Ford; Trupti Ranka; Thomas Salanski

doi:10.1117/12.2561744

13 December 2020 A novel power and communications hub: the GMT EtherCAT and power hub

John M. Ford, Trupti Ranka, Thomas Salanski

Proceedings Volume 11452, Software and Cyberinfrastructure for Astronomy VI; 114521M (2020) https://doi.org/10.1117/12.2561744
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

Each of the seven primary mirror cell in the GMT contains over 225 EtherCAT slaves in the cell, leading to a nightmare of cabling. Optimization of the initial construction and ongoing maintenance of the cells requires reduced complexity of wiring in the cell. Employing the concept of Power over EtherCAT and a star configuration, the resulting the EtherCAT Power and Communications Hub design reduces the wiring in the cell by 2/3, while additionally providing centralized power management and diagnosis of each actuator communications link. The design consists of an EtherCAT slave to allow the central control system to monitor and control the slaves attached to the hub, and power control circuits to provide and monitor power to each slave. In addition to providing a significant reduction in wiring complexity, the hub serves as an additional control point for power to each support actuator, enhancing mirror safety through redundant control of the actuators. This paper describes the motivation driving the requirements, the resulting requirements and design, and test results of the prototype EtherCAT and Power Hubs.

Conference Presentation

Citation Download Citation

John M. Ford, Trupti Ranka, and Thomas Salanski "A novel power and communications hub: the GMT EtherCAT and power hub", Proc. SPIE 11452, Software and Cyberinfrastructure for Astronomy VI, 114521M (13 December 2020); https://doi.org/10.1117/12.2561744

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available