Celestron, 2835 Columbia Street, Torrance, CA 90503 • Phone (310) 328-9560 • Fax (310) 212-5835 #93514-INST 01-08
#93514 - Motor Drive – AstroMaster, Powerseeker, CG-2 & CG-3
To allow tracking of celestial objects, Celestron offers an optional single axis motor drive for the CG-2 and CG-3 EQ Mounts.
Once polar aligned, the motor drive will accurately track objects in Right Ascension as they move across the sky. Only minor
adjustments in Declination will be necessary to keep celestial objects centered in the eyepiece for long periods of time.
Operation Instructions:
The Motor Drive is powered by one 9v alkaline battery. This can power the drive for up to 40 hours, depending on motor speed
setting and ambient temperature. To replace the battery:
1. Unscrew the two mounting screws from the motor cover plate (see figure 1).
2. Remove the cover plate from the motor to reveal the battery compartment.
3. Attach the battery to the wire harness connected to the motor.
4. Replace the motor cover plate and mounting screws.
The Motor Drive is equipped with a speed rate regulator (see figure 1) that allows the motor drive to track at a faster or slower
speed. This is useful when observing non-stellar objects like the moon or Sun, which travel at a slightly different rate than the
stars. Never observe the Sun without using a proper solar filter with your telescope. To change the speed rate of the drive
motor:
1. Slide the On/Off switch to the "On" position. The red power indicator light will illuminate.
2. Turn the speed rate regulator knob clockwise to increase the speed of the motor and counterclockwise to decrease the speed.
To determine the proper rate of speed, the telescope should be roughly polar aligned to Polaris. Find a star on the celestial equator
(approximately 0º declination) and center it in the eyepiece. For more accuracy, use a cross hair eyepiece. With the drive off,
notice which direction the star drift across the field of view of the eyepiece. This direction is West. If using a cross hair eyepiece,
rotate the eyepiece so that one of the cross hairs is parallel to the direction the star drifts. Now turn the drive on and let the
telescope track for 1 or 2 minutes. If after a few minutes, the star drifts to the West, the motor is tracking too slowly. Turn the
Powe
r
Indicato
r
On/Off Switch
N
orth/South
Switch
Speed Rate
Regulato
r
Mounting
Screw
Mounting
Scre
w
Figure 1
Loading ...
