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\large
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\centerline {\bf 3.4\_V2.0 AUTONOMOUS POWER-UP PROCEDURE } 
\vspace{0.25in}

\normalsize
\noindent{\it Last Revised: June 28,1999}\\
\noindent{\bf Filename: SIPUSCS} \\


\noindent {\bf BRIEF FUNCTIONAL DESCRIPTION:} \\
\normalsize
This procedure is to turn the ACIS instrument on after an eclipse exit
or an EPS anomaly power shutdown
and put the instrument into a configuration from which the ground
can quickly resume science operations.  If the power has been off for
a long time, it will take ACIS a long time to get back to a thermal
state in which high-quality science observations can be conducted;
but if the power outage was short ACIS could be back to normal
science observations rather quickly.
Therefore, the detector housing heater is turned on first since the
detector housing will take the longest to reach its operating
temperature.  The DPAs and DEA are then turned on and the current focal
plane temperature is recorded.  The BEP is then warm-booted to start
the focal plane temperature regulation using the default system
configuration table.  This procedure works if the power was completely off or
if ACIS was in the memory save mode with the DPA side A left on so
that BEP A was always on.  This procedure does not assume a particular
telemetry format.  However, if the spacecraft is configured so that
no ACIS science telemetry is received (as {\it might} be the case in
format 5, the likely format after an EPS power anomaly), then all the
steps below which required verification using the science telemetry
will remain unverified but should be commanded successfully.


\vspace{0.25in}
\noindent The sequence of actions will be: 
\be
\item enable and turn on the Detector Housing heater
\vspace{-0.10in}
\item Turn on the DPA sides A and B
\vspace{-0.10in}
\item Turn on the DEA side A, start DEA Housekeeping, get FP temperature
\vspace{-0.10in}
\item Warm boot the BEP, start DEA Housekeeping run
\vspace{-0.10in}
\item Verify ACIS is in the proper state and the temperatures are
approaching the nominal values
\ee


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\normalsize
\noindent {\bf ASSUMED INSTRUMENT STATE:} \\
\normalsize
Assumes the instrument is powered off or in memory save mode. \\

\vspace{0.25in}
\normalsize
\noindent {\bf SPECIAL INITIAL CONDITIONS:} \\
\normalsize
No telemetry format is assumed; however it would be best to be in
format~2 in order to receive the SW TLM verifiers.

%\newpage 

\vspace{0.25in}
\normalsize
\noindent {\bf OPERATIONAL CONSTRAINTS/CAUTIONS:} \\
\normalsize


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

{\bf V1.3}
\begin{itemize}
\item changed command in steps  3.3 and 4.4 to ``XDV0000001'' to be consistent
with what Royce provided and is actually on the spacecraft
\item added SW TLM verifiers
\item added step 5 to verify the state of ACIS
\end{itemize}

{\bf V2.0}
\begin{itemize}
\item ACIS Team signed-off version
\item changed version number in ``Change History'' to 1.3 from 1.2
\item changed HW TLM verifier in step 5.4 to ``1DEN1BVO''
\end{itemize}

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