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Proceedings Paper

The architecture and initial results of the Large Millimeter Telescope control system
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Paper Abstract

As the Large Millimeter Telescope (LMT) has continued to progress towards scientific operations, some preliminary commissioning of the telescope control system has taken place. We present the architecture of the LMT control system along with initial commissioning results of the LMT servo and drive system. The LMT azimuth drive system is a wheel-on-track mechanism with sixteen individually driven wheels on a circular track. The elevation drive system consists of two main gear arcs, each driven by two pinions. All twenty of the drives (sixteen in azimuth and four in elevation) consist of a motor and a gearbox. These drives are controlled by a fully digital servo system that is divided into a drive control unit which consists of the servo amplifiers and an embedded PLC that implements torque sharing and safety interlocks, and an antenna control unit that implements the servo control loops and astronomical tracking. The results of the initial commissioning of the LMT servo and drive system include full range motion in azimuth and elevation, azimuth track welding effects, elevation gear rims alignment effects, elevation balance, friction contribution to servo errors, and initial tracking accuracy.

Paper Details

Date Published: 17 July 2008
PDF: 10 pages
Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 701209 (17 July 2008); doi: 10.1117/12.790245
Show Author Affiliations
Kamal Souccar, Univ. of Massachusetts, Amherst (United States)
David Smith, MERLAB, P.C. (United States)

Published in SPIE Proceedings Vol. 7012:
Ground-based and Airborne Telescopes II
Larry M. Stepp; Roberto Gilmozzi, Editor(s)

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