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FOCUS MOTOR FOR SCT & EDGEHD INSTRUCTION MANUAL
5 I ENGLISH
If you wish to change the motor speed rate, simply press
the BACK button, and select another rate.
If using with the Celestron Focuser Utility Program or
Celestron PWI, you can manually slew the focuser by
using the MOVE IN (rotates the motor clockwise) and
MOVE OUT (rotates the motor counter-clockwise)
buttons from the user interface. Change the speed rate
by using the Rate slider.
When the focus motor is in use, you can see the rear of
the motor’s clamping collar rotating. There is a reference
printed in white on the focus motor to determine which
way the primary mirror is moving within the telescope.
The reference indicates that when the motor is rotating
clockwise, the primary mirror is moving in the negative
direction (i.e. towards the rear cell), and when the motor
is rotating counter-clockwise, the primary mirror is
moving in the positive direction (i.e. towards the Schmidt
corrector).
You can go to a specific focuser index position by using
a “Move To” command. If using a Celestron hand control,
press MENU and select “Focuser”, then “Move To.” From
here, you can enter a focuser index position and the
motor will automatically slew to that position. When using
the Celestron Focuser Utility Program or Celestron PWI,
enter a focuser index position in the MOVE TO window,
and the motor will automatically slew to that position.
The “Move To” function is convenient to use after you
have determined the best focus for your setup. Take note
of the focuser index position, and you can automatically
return to that position in the future. The current index
position is shown on the “Move To” screen for the
hand control, and above the MOVE TO button for the
Celestron Focuser Utility Program and Celestron PWI.
NOTE: When using the “Move To” command to automatically
move the focuser to an index position, the focus motor will
always approach focus in the positive direction (i.e. with
the focus knob rotating counter-clockwise and the primary
mirror moving outward). This is done to ensure the best
accuracy of the “Move To” command, as it eliminates any
potentially “lost” index position steps due to backlash in the
telescope’s focuser system. If the desired index position is
inward (i.e. a lower number) from the initial position, the
focus motor will move 500 steps inward past the selected
index position before reversing direction and returning to
the selected position.
The “+” and “-” reference printed in white on the motor indicates the
direction in which the primary mirror is moving.
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