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{\LARGE\bf \sf Software Engineering} \\
\vspace{0.15in} {\Large\bf \sf CSE470 \hspace*{4.0truein} Spring 2002} \\
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{\Large \bf \sf Homework 2 \hspace*{3.3truein} Due: 2/12/2002}
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\begin{enumerate}
\item In this problem you are asked to design the dynamic model for a
controller class that controls a large pump motor (several hundred
horsepower) for a municipal water system. The motor has two ``coils''
for running. The first is a ``starter coil'' and is engaged to start
the motor turning and bring it up to speed. This coil draws a large
amount of power and can only be used a short time (5 seconds max) to start
the motor. Once the motor is up to speed, the starter coil is turned
off, and the running coil is turned on. When the motor has attained
sufficient speed, a ``speed'' event occurs. We need to also monitor
the motor bearing temperature during the first 500 milliseconds of
starting to ensure that the bearings will not seize. If the ``bearing\_temp''
signal occurs during the first 500 milliseconds of starting, the motor
has to be shut down completely, an ``error 1'' signaled, and no other
signals are accepted.

The pump should be primed with water, but may be empty.
If a ``speed'' signal is received within 2 seconds of starting, the
motor has come up to speed too quickly, and the pump is probably not
primed correctly. In this case, we need to shut everything off, signal
``error 2'', and not
accept any more signals. On the other hand, if the motor is not up to
speed within 5 seconds, there is danger of overheating the starting
coils, so an ``error 3'' must be signaled and everything shut
down. 

Once correctly started, the motor runs until a ``stop'' signal
occurs, which must cause the motor to be shutdown in preparation for another
``start'' signal.

Draw the dynamic model for this controller.

\answer{}

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