# Hoist controller

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A '''hoist controller''' is the [controller](/source/Controller_(control_theory)) for a [hoist](/source/Hoist_(device)).  The term is used primarily in the context of electrically operated hoists, but it is apparent that the control systems of many 20th century steam hoists also incorporated controllers of significant complexity.  Consider the [control system](/source/control_system) of the [Quincy Mine](/source/Quincy_Mine) No. 2 Hoist.<ref>[http://files.asme.org/ASMEORG/Communities/History/Landmarks/5631.pdf Quincy No. 2 Mine Hoist (1920)] {{webarchive|url=https://web.archive.org/web/20110717001422/http://files.asme.org/ASMEORG/Communities/History/Landmarks/5631.pdf |date=2011-07-17 }} National Historic Engineering Landmark brochure, The American Society of Mechanical Engineers, 1984.</ref> This control system included interlocks to close the [throttle](/source/throttle) valve at the end of trip and to prevent opening the throttle again until the [winding engine](/source/winding_engine) was reversed.  The control system also incorporated a [governor](/source/Centrifugal_governor) to control the speed of the hoist and indicator wheels to show the hoist operator the positions of the [skips](/source/Skip_(container)) in the [mine shaft](/source/shaft_mining).

The hoist controllers for modern electric [mining hoists](/source/hoist_(mining)) have long included such features as automatic starting of the hoist when the weight of coal or ore in the [skip](/source/Skip_(container)) reaches a set point, automatic acceleration of the hoist to full speed and automatic deceleration at the end of travel.<ref>H.K. Burch and M.A. Witting, Automatic Operation of Mine Hoists, in [https://books.google.com/books?id=oioLAAAAYAAJ Trans. Amer. Inst. of Mining Engineers, Vol. LV], 1016, page 10.</ref>
Hoist controllers need both velocity and absolute position references taken, typically taken from the winding drum of the hoist.<ref>A.R. Lilly, Hoist Controller, U.S. Patent 3,110,199 granted Aug. 30, 1960.</ref>  Modern hoist controllers replace many of the mechanical [analog](/source/Analogue_electronics) mechanisms of earlier controllers with digital control systems.

== See also ==
* [Hydraulic hooklift hoist](/source/Hydraulic_hooklift_hoist)

== References ==
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Category:Mining equipment

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Adapted from the Wikipedia article [Hoist controller](https://en.wikipedia.org/wiki/Hoist_controller) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Hoist_controller?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.