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\newcommand{\axaf}{{\em AXAF}}
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\centerline {\bf 4.21\_V2.0 SET FOCAL PLANE TEMPERATURE TO -110 C }
\vspace{0.25in}

\normalsize
\noindent{\it Last Revised: June 29,1999}\\
\noindent{\bf Filename: setfp\_m110} \\


\noindent {\bf BRIEF FUNCTIONAL DESCRIPTION:} \\
\normalsize
This is an ``atomic'' procedure which simply sets the focal plane
temperature to -110 C.

\vspace{0.25in}
\noindent The sequence of actions will be: 
\be
\item disable the focal plane bakeout heater and warm boot the BEP
\vspace{-0.10in}
\item start or re-start a DEA HKP run
\vspace{-0.10in}
\item load the ACIS SW command packet which sets the temperature
\ee


\vspace{0.15in}
\normalsize
\noindent {\bf ASSUMED INSTRUMENT STATE:} \\
\normalsize
Assumes that at least one side of the DPA and DEA A are on and the 
flight SW is running. \\

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\normalsize
\noindent {\bf SPECIAL INITIAL CONDITIONS:} \\
\normalsize
Assumes that the contamination environment allows the focal plane to
be cooled to -110 C. \\
%The environment must be clean enough to allow opening of the valve. \\
%Assumes that \axaf\/ ISIM RCTU is powered on and in telemetry format 6. \\

%\newpage 

%\vspace{0.25in}
\normalsize
\noindent {\bf OPERATIONAL CONSTRAINTS/CAUTIONS:} \\
\normalsize
The focal plane should not be cooled if the spacecraft is still
outgassing significantly and there is a path for the contaminants to
flow to the focal plane. \\


\vspace{0.15in}
\normalsize
\noindent {\bf REFERENCES:} \\
\normalsize

\normalsize
\noindent {\bf CHANGE HISTORY:} \\
\normalsize

{\bf V1.0}
\begin{itemize}
\item initial release, copied from procedure to set the focal plane
temperature to -120~C called ``setfp\_m120''.
\end{itemize}

{\bf V2.0}
\begin{itemize}
\item ACIS Team signed-off version
\item changed SW TLM verifiers in step 1.6 to check that the
warmbootFlag =1 and not to check the SW version number
\item changed expected value of BEP Select verifier in step 1.7 to BEP
A or BEP B
\item changed expected value of ``1STAT7ST'' to ``0'' in step 1.7
\item modified step 3.3 to check that the focal plane is stable at -110~C
\item edited ``Operational Constraints and Cautions''
\end{itemize}


\newcommand{\tablecaptiontext}{SET THE FOCAL PLANE TEMPERATURE TO -110 C}
\input{setfp_m110.tab}

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