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The fast_accel parameter is used to control motor acceleration slope when the
head stage stepper motor when it is running at FAST speed. The motor ramps
up from fast_start_vel to fast_end_vel at a rate specified by fast_accel
and ramps back down using the same acceleration slope as it reaches its target
position. If the value in fast_start_vel is larger than the value in
fast_end_vel, then the stepper motor will start and stop at the speed
specified by the fast_end_vel and will not ramp up or down.
Decreasing this value will reduce the motor acceleration.
For small acceleration values, the motor can take a very large number of steps
to go from the start velocity to the end velocity. If the distance that the
motor needs to move is too short for it to reach the end velocity, then it
will perform a partial acceleration to the highest velocity attainable under the
current acceleration value before starting to ramp back down to stop at the
target position.
FAST speed is only used if specified in a moveto diagnostic command
The units used by this parameter are somewhat arbitrary. To convert them to
actual steps per second, please consult the tables in the CY-545 data book.
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