1 saw   1.1 \documentclass{chowto}
 2           
 3           \title{Operating the HMS Shield House Door}
 4           \howtotype{user} % ``expert'', ``user'', ``reference''
 5           %\experiment{Name of experiment} % Optional
 6           \author{H. Fenker}
 7           \category{hms} % Subject area of this document
 8           
 9           %\maintainer{Name of person maintaining document} % Optional

10 saw   1.2 \date{April 16, 2003} % Can use \today as the argument

11 saw   1.1 
12           \begin{document}
13           
14           \begin{abstract}
15           This document describes the operational procedures for opening
16           and closing the HMS shield house door.
17           \end{abstract}
18           
19           
20           \section{Related {\it Howtos}} 
21           The following Hall-C {\it Howto} documents may be helpful.
22           
23           %--DELETE THOSE  DOCUMENTS MENTIONED HERE WHICH ARE IRRELEVANT
24           User Level Documents-
25               \par \indent \indent Base Equipment Checklist \cite{howto:base_equip_checklist}
26               \par \indent \indent Operating the SOS Shield House Door \cite{howto:open_sos_door}
27               \par \indent \indent Operating the HMS Vacuum Window Shutter \cite{howto:open_hms_shutter}
28           
29           \section{Door Description}
30           Normal access to the interior of the HMS shield house is through the
31           15 ton concrete-and-steel door. 
32 saw   1.1 
33           \section{Door Operation}

34 saw   1.2 The door is moved
35           by energizing the drive motor attached to it. Once you have it open as wide as you
36           need, it is suggested that you use the rubber block provided to
37           chock the door in the open position.
38           It does tend to drift closed if not restrained. If you find yourself
39           inside the shield house with the door closed, there are pushbutton
40           controls inside which you can use to open it (see below).

41 saw   1.1 
42           \subsection{Interlocks}
43           An interlock prevents access to the HMS detector hut unless the
44           safety shutter inside the hut has been moved to its `down' position,
45           such that it covers the vacuum window. This is to prevent people from
46           accidentally touching the large vacuum window. The door cannot be opened

47 saw   1.2 unless the shutter is already inserted. To prevent the door from
48           drifting open on its own, a magnetic lock holds it in the closed
49           position. This lock is de-energized when the {\tt OPEN} control
50           button is pressed.

51 saw   1.1 
52           \subsection{Motorized Operation}

53 saw   1.2 The door is opened or closed by activating the motor attached to 

54 saw   1.1 its hinges. The control panel for the door is mounted on the

55 saw   1.2 post behind and to your right as you stand in front of the door. A
56           duplicate set of controls is inside the shield house, to the
57           right of the door. Press and

58 saw   1.1 hold the button marked {\tt OPEN} and the door will be slowly
59           opened. Press {\tt CLOSE} to move the door towards the closed
60           position. Remember that the door will continue to move after

61 saw   1.2 you release the button because of its inertia. It takes about
62           two minutes to fully open the door or to close it from the
63           fully opened position. When closing the door, make certain
64           to keep {\tt CLOSE} pressed until the magnetic lock near
65           the top of the door engages.

66 saw   1.1 
67           
68           \end{document}
69           
70           % Revision history:

71 saw   1.2 % $Log: open_hms_door.tex,v $
72           % Revision 1.1  2003/04/04 15:59:47  saw
73           % Initial Checkin