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Problem with G11 and Gemini L4 V1.04 - Older version

 

Hello guys,

my Gemini System runs about 24 years without a greater problem. But now, i have a problem with this system.
If i want to slew to an object, the system make a slew, goes into centering mode but does not stop. The gemini stay in
this mode until i press the right-arrow button on the controler to interrupt the centering. If i want to slew to another
objekt, the controler print the message *Interupted" in the display. There is no possibility to slew to any other object.
The system repeat the "Interupt" message on every try to slew. Also from a pc given object, from N.I.N.A., for example.

What problem could it be with the controler ?

I check the following things:

1. Complete reboot of the gemini system. - No effect
2. Disconnect from the pc and try to slew - No effect
3. Disconnect al cables and checked for dirt - Everything seems to be okay.

Thanks a lot for your support !!?
 

Hi ?,
?
I'd start by resetting Gemini completely by taking out the 3v battery for a minute or two, and then replacing it with a new, fresh one. **Interrupted** message usually indicates that Gemini thinks it can't reach the object without violating safety limits. This, and the other issues could easily be caused by corrupted settings in Gemini.?
?
Regards,
?
?-Paul
?
On Sun, Nov 3, 2024 at 02:44 PM, <Stargazer32584@...> wrote:

Hello guys,

my Gemini System runs about 24 years without a greater problem. But now, i have a problem with this system.
If i want to slew to an object, the system make a slew, goes into centering mode but does not stop. The gemini stay in
this mode until i press the right-arrow button on the controler to interrupt the centering. If i want to slew to another
objekt, the controler print the message *Interupted" in the display. There is no possibility to slew to any other object.
The system repeat the "Interupt" message on every try to slew. Also from a pc given object, from N.I.N.A., for example.

What problem could it be with the controler ?

I check the following things:

1. Complete reboot of the gemini system. - No effect
2. Disconnect from the pc and try to slew - No effect
3. Disconnect al cables and checked for dirt - Everything seems to be okay.

Thanks a lot for your support !!?
 

I have actually seen this before on my G1 a few times, many years ago. ? It went away, so, I thought it a firmware glitch. ??

But it¡¯s possible it¡¯s not reading encoder pulses properly so keeps moving but I cannot answer "why in centring"? ?? Can you change the centring rate to see if this changes?

All I can offer at this time is to ask is it happening in Ra or DEC or both axes? ? It¡¯s possible an EEPROM issue or encoder PLD readers on main board that reads motor encoder pulses! ? These had a programmed life ~15/20 years plus (according to datasheets) but, the their program input retention was not limitless in time due due to ¡­well, I¡¯m not sure decay in gate programming?.?

But these can be changed or re-programmed. I've never tried to program one in situ I have removed them programmed a new one put it in. ? That was to fix drive encoder reading issues and on G1s and these are known failure point for many reasons.?
?
Whether this is your issue ¡­I cannot say but, I suspect a sidereal rate check could determine the issue. ? On a G11 the Ra motor axes rotated at 9.5737s per Revolution. ? What you can do is take out Ra motor set it up on a desk, put a pointer on the motor pinion and time it for 10 revolutions as it passes a marker¡­that¡¯ll be enough to check it.?

I say Ra because it¡¯s used the most compared to DEC axes PLD.?
?
But I¡¯m only guessing here I mean it could be stiction of the axes (like friction)..... I just don¡¯t know!. ?Oh if you have Varistors Rv1/2/3/4 on the main board measure them both ways with an ohm meter (power off) they can cause encoder pulse degradation. ?Removing them fixes this. ?? See image on my google drive
?
Lastly what ver EEPROM do you have?
?
cheers..ill await your reply.?? I'm sure Paul has seen or heard of this!
?
--
Brendan
 

Actually Paul is correct...check basics first...new battery re-input data and limits
?
retry it...I guess you can emulate it during daytime to slew to stars that are above horizon during the day...using a plainsphere
?
cheers
--
Brendan
 

¿ªÔÆÌåÓý

You've checked the cables already, this is good, since every little spurious signal that could be a button press (Deluxe or classical HC and AG) would be interpreted as an interruption of a Goto operation. Disconnect an autoguider. Please check the sockets carefully. Is there a message displayed at startup regarding AG or HC?

¸é±ð²Ô¨¦



Am 03.11.24 um 20:42 schrieb Stargazer32584 via groups.io:

Hello guys,

my Gemini System runs about 24 years without a greater problem. But now, i have a problem with this system.
If i want to slew to an object, the system make a slew, goes into centering mode but does not stop. The gemini stay in
this mode until i press the right-arrow button on the controler to interrupt the centering. If i want to slew to another
objekt, the controler print the message *Interupted" in the display. There is no possibility to slew to any other object.
The system repeat the "Interupt" message on every try to slew. Also from a pc given object, from N.I.N.A., for example.

What problem could it be with the controler ?

I check the following things:

1. Complete reboot of the gemini system. - No effect
2. Disconnect from the pc and try to slew - No effect
3. Disconnect al cables and checked for dirt - Everything seems to be okay.

Thanks a lot for your support !!?
 

Hi Guys,
?
thanks a lot for your answers !
?
Later, i will replace the 2032 battery.
I don't use the AG-port. I have an Starlight AO and only use the RS232 Port. But before i change the battery, i will disconnect the RS232 cable.
?
@Rene: No. There is no message in the display on start-up. Everything is fine and normal.?
?
Thanks a lot for your support!
 

On Mon, Nov 4, 2024 at 06:27 AM, <Stargazer32584@...> wrote:
Later, i will replace the 2032 battery.
Just keep the battery out for a minute before replacing. That's needed for the capacitors to fully discharge, allowing all the settings to be completely wiped from memory resulting in a full reset.
 

Hi,

i replaced the CR2032 battery and what shoud i say ??

THANK YOU ALL FOR YOUR POSTS !?

This was the reason for my gemini fault. After i replaced the battery, the mount runs perfect and everything is fine.
He slews, centered and finished.?

Now, he works on a part of a mosaic of M31.

Thank you very much for your help !!

Wish you a great evening and clear skies

´¡²Ô»å°ù¨¦
 

?
IME with Gemini 1 controllers you really need to replace the battery at least once a year even if you don't think so.? My advice is to ALWAYS have a small toolkit with a couple of spare coin cells in your Gemini-1 case.? If not for your mount other people with Gemini-1s who are not so well prepared.? You will become very popular with fellow Gemini-1 owners.? ? ?
?
--

Chip Louie Chief Daydreamer Imagination Hardware?

? ?Astrospheric - South Pasadena?
 

Good call Paul, well done!
Cheers
--
Brendan

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