Re: [ap-gto] 400 GTO Mount Questions


Feb 5 1:21 PM

 


----------------------------

#1827 Feb 5 1:21 PM

Greetings everyone:



I've been a subscriber to the list for a few months and have learned a lot

from all of you. I have both a Traveler and 130 EDF that I use (separately)

on a 400 GTO mount (version 2.5 controller) and could use some advice with

the following:



- Occasionally, after using the mount for a few hours, the entire system

freezes while slewing to a selected object. I have not been able to unfreeze

the system without disconnecting the power and then having to go through the

full calibration routine.



- I've read some recent messages here about the safe zone and still don't

understand how it works. How can the safe zone be defined without using safe

ranges of both RA and Dec and what is the meaning of the single numerical

input of between 0-20 degrees?



Any help would be much appreciated.



David Green

dcverde@...

Santa Barbara, California



----------------------------

#1828 Feb 5 9:43 PM

Hi David,



Rumor has it that an upcoming software release will fix this problem. ;-)



What was the ambient temperature when this "freeze" took place.



How long had you been out observing?



Was the hand controller "idle" for any length of time?



Mark

On 2/5/01 at 9:21 PM, dcverde@... (David C. Green) wrote:



> Greetings everyone:

>

> I've been a subscriber to the list for a few months and have learned a lot

> from all of you. I have both a Traveler and 130 EDF that I use (separately)

> on a 400 GTO mount (version 2.5 controller) and could use some advice with

> the following:

>

> - Occasionally, after using the mount for a few hours, the entire system

> freezes while slewing to a selected object. I have not been able to unfreeze

> the system without disconnecting the power and then having to go through the

> full calibration routine.

>

> - I've read some recent messages here about the safe zone and still don't

> understand how it works. How can the safe zone be defined without using safe

> ranges of both RA and Dec and what is the meaning of the single numerical

> input of between 0-20 degrees?

>

> Any help would be much appreciated.

>

> David Green

> dcverde@...

> Santa Barbara, California

>

>

>

>

>

>



----------------------------

#1829 Feb 6 3:58 AM

David-



The degree range of safe zone refers to the deviation from the vertical

from which the scope will be prevented from pointing. You enter the

range in altitude, and the mount takes care of figuring out the RA/Dec

that needs to be excluded at any particular moment.



If the scope will run into the tripod when it is pointing up at an

altitude of 74 degrees, you will want to set the safe zone to 0-20. Or

get a shorter scope.g>

> - I've read some recent messages here about the safe zone and still don't

> understand how it works. How can the safe zone be defined without using safe

> ranges of both RA and Dec and what is the meaning of the single numerical

> input of between 0-20 degrees?

--

Best regards,

Chuck Hancock DMD



McDonough GA USA



----------------------------

#1831 Feb 6 9:07 AM

----- Original Message -----

From: "David C. Green" dcverde@...>

> Greetings everyone:

> - Occasionally, after using the mount for a few hours, the entire system

> freezes while slewing to a selected object. I have not been able to

unfreeze

> the system without disconnecting the power and then having to go through

the

> full calibration routine.



I think I have V2.6, and yes, I've had that happen. I have no explanation

except it happens a lot more on a 70 amp/hr deep cycles than when plugged

into a 3 amp radio shack 12v transformer. I don't use the Goto very much

preferring to starhop, so the fact it's happen to me tells me it might be

more common than we might think. Or I have a crappy deep cycle battery.



Clear skies,

Jeff



----------------------------

#1839 Feb 6 3:38 AM

Mark and Chuck:



Thanks for the quick response.



Mark - The temperature was about 45 deg. F, the mount had been on earlier in

the afternoon and then out of a powered off park for about four hours, and

the hand controller had been in frequent (every few minutes) use prior to

the freeze. BTW, this has happened more than once under similar conditions.



Chuck:

How about one more time? If the safe zone is the area within which the scope

will be prevented from moving, and in you're example it can move 74 degrees

from vertical before hitting the tripod, then should the controller input be

16 (90-74) degrees? I don't believe the controller takes a range, but only a

single numerical input. Or, as you suggested, one can simply get (or cut it

into) a shorter scope . g>



Regards,

David



David Green

dcverde@...

Santa Barbara, CA



----------------------------

#1840 Feb 6 12:16 PM

In a message dated 2/6/01 1:35:44 PM Central Standard Time, dcverde@...

writes:



< Mark - The temperature was about 45 deg. F, the mount had been on earlier

in

the afternoon and then out of a powered off park for about four hours, and

the hand controller had been in frequent (every few minutes) use prior to

the freeze. BTW, this has happened more than once under similar conditions. >>



The keypad is not "freezing". What may be happening is that there is some

kind of overload on the mounting that causes the RA motor to stop tracking.

When the servo controller senses that the RA tracking has ceased, it shuts

off all functions to prevent catastrophic motor burnout. The only way to

reset with the old software is to turn the power off (the new version will

have automatic reset and annunciation of problems on the keypad readout).

There are any number of reasons that the RA motor may be stalling, so if it

continues, you can send the unit in explaining the problem, and we will have

a look at the mount to see what caused it. The keypad has no control over

anything. If the servo shuts down for the above reasons, the keypad will not

go any further in its operation.



Roland Christen







----------------------------

#1842 Feb 6 7:15 PM

David-



What I meant in my example was that the scope could move anywhere from

Horizontal (0 deg.) up to 74 degrees altitude before the back of the

scope runs into the tripod. So you would set the safety Zone at 20, or

20 degrees FROM the Vertical. You could just set Zone at 16 or 17.



Aside: When I answered your previous post I had not actually used the

Safety Zone feature. At first, I did have a problem with my SCT's 2"

diagonal running into the tripod's bulky leg joints - the Celestar 8

Deluxe standard tripod. Likewise the counterweight. So I made a tripod

extension to raise the adapter ring another 2.625" above the top of the

tripod. The tripod extension is a nice laminated wood

(walnut/fir/walnut with a water-based varnish) cylinder that serves as a

mini pier. Extra long allen bolts hold the adapter ring to the tripod

via holes in the extension. It works like a charm for the SCT, but I

guess a portable pier may be the way to go if and when I get one of

those premium refractors - all in good time.

> How about one more time? If the safe zone is the area within which the scope

> will be prevented from moving, and in you're example it can move 74 degrees

> from vertical before hitting the tripod, then should the controller input be

> 16 (90-74) degrees? I don't believe the controller takes a range, but only a

> single numerical input. Or, as you suggested, one can simply get (or cut it

> into) a shorter scope . g>

>

> Regards,

> David

>

> David Green

> dcverde@...

> Santa Barbara, CA



--

Best regards,

Chuck Hancock DMD



McDonough GA USA



Contact Us
This Site's Privacy Policy
Google's privacy policies

S
e
n
i
o
r
T
u
b
e
.
o
r
g