Mr. Thomas Salanski Profile

Thomas Salanski

at The Univ. of Arizona

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

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

John Ford, Trupti Ranka, Thomas Salanski

Proceedings Volume 11452, 114521M (2020) https://doi.org/10.1117/12.2561744

KEYWORDS: Actuators, Control systems, Mirrors, Control systems design, Fluctuations and noise, Power supplies, Stars, Safety, Prototyping

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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.

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