Manual Celestron CGX-L EQUATORIAL (page 10 of 140) (English, German, French, Italian, Spanish)

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10 | ENGLISH

Precise Polar Alignment

Celestron’s All-Star Polar Alignment allows you to precisely

polar align your mount without using Polaris or a polar axis

ﬁnder. This software-assisted polar alignment allows you to

choose a convenient star.

Prerequisite: The CGX-L must ﬁrst be aligned with a

Two Star, One Star, or Solar System Align.

1. Select a suitable bright star from the NexStar hand

control’s database. Slew the telescope to the star.

2. Press the ALIGN button. Select “Polar Align” then

“Align Mount” from the list.

3. The telescope will then re-slew to the alignment star

and ask you to center it in the eyepiece in order to

“sync” on the star. Press ENTER, center the star with

the arrow keys, then press ALIGN to sync on the star.

4. Press ENTER and the telescope will slew to the

position that the star should be if it were accurately

polar-aligned. At this point, do not use the hand

control to center the star.

5. Use the mount’s altitude and azimuth adjustments

to center the star in the eyepiece.

6. Press the ALIGN button.

The mount is now precisely polar aligned. You may

proceed to use the mount without a new go to alignment.

Motion Range in Mount

Sofware Range

The CGX-L employs software controlled limit sensors which

detect when the mount has nearly reached its mechanical

range limit. Once the mount reaches the sensor, the motor

will decelerate to a stop and a “Limit Switch” warning

message will appear. The mount will no longer slew in the

direction of the limit switch until you reverse directions.

Mechanical Range

The CGX-L uses internal cabling so the mount is designed

not to move more than a certain range. Both axes are

limited by a hard stop built into the mount. This limited

range can also help prevent unintentional interference

between your telescope and the mount or tripod. If for any

reason the mount exceeds the software limit switch (or if

the clutch is unlocked and the mount is manually moved),

the mount will halt at the hard stop.

R.A. limit (Figure 9.1) allows you to track 20º past the

meridian. If you leave the mount unattended while it’s

tracking, it will automatically stop before reaching the

mechanical hard stop. Dec limit (Figure 9.2) contains

enough slew range to reach any portion of the sky.

Figure 9.1 One side of R.A. mechanical limit

Figure 9.2 One side of DEC mechanical limit

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Celestron CGX-L EQUATORIAL Manual

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