RE: [ap-gto] Re: 900GTO slews 96hrs/1440degrees on GOTO


Jul 27, 2013

 


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

#41222 Jul 27, 2013

As part of my personal learning curve, I have my 900GTO/GTOCP3/Q/4.17 set up

next to my desk. No OTA or counterweight shaft.



Four days ago I used the hand controller to set the tracking rate to "stop"

and have had the mount idling with the power on from then to now.



Today I used the hand controller to change the tracking rate from "Stop" to

"Side" and then commanded the mount to slew to Mercury which should have

been very-close to where it was currently pointing.



To my surprise, the RA axis did four complete revolutions before pointing

towards Mercury.



I had assumed that the mount would automatically subtract 24hrs/360deg from

the current RA position whenever it exceeded 24hr/360deg.



I assume this isn't a bug so I am looking for some insight on the logic

behind this behavior so I can better-understand my mount and how to use it

most safely and effectively.



Thanks for reading!



Christopher Erickson

Consulting Engineer

Summit Kinetics

Waikoloa, HI 96738

www.summitkinetics.com



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

#41256 Jul 29, 2013

Stop is not the same thing as park. Indeed the mount will accumulate 4 days of motion when in the stopped mode, and when you slew it will try to compensate for that.



To really stop the mount with power still on, you have to initiate a proper Park command, which can be done via the Ascom driver. Or you can send it to one of the 3 park positions via the keypad.



Rolando





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

From: Christopher Erickson christopher.k.erickson@...>

To: ap-gto ap-gto@yahoogroups.com>

Sent: Sun, Jul 28, 2013 1:16 am

Subject: [ap-gto] 900GTO slews 96hrs/1440degrees on GOTO





As part of my personal learning curve, I have my 900GTO/GTOCP3/Q/4.17 set up

next to my desk. No OTA or counterweight shaft.



Four days ago I used the hand controller to set the tracking rate to "stop"

and have had the mount idling with the power on from then to now.



Today I used the hand controller to change the tracking rate from "Stop" to

"Side" and then commanded the mount to slew to Mercury which should have

been very-close to where it was currently pointing.



To my surprise, the RA axis did four complete revolutions before pointing

towards Mercury.



I had assumed that the mount would automatically subtract 24hrs/360deg from

the current RA position whenever it exceeded 24hr/360deg.



I assume this isn't a bug so I am looking for some insight on the logic

behind this behavior so I can better-understand my mount and how to use it

most safely and effectively.



Thanks for reading!



Christopher Erickson

Consulting Engineer

Summit Kinetics

Waikoloa, HI 96738

www.summitkinetics.com











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



To UNSUBSCRIBE, or for general information on the ap-gto list

see groups.yahoo.com/group/ap-gtoYahoo! Groups Links















[Non-text portions of this message have been removed]



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

#41269 Jul 29, 2013

Rolando,



It sounds like there needs to be a warning in the user manual, to always

Power off (or Park) the mount - either at end of session, or if left idling

for some time, Park before resuming use.



If it was "left idling", as he said he did, for a few weeks, or a

month, the mount would corkscrew the entire length of remaining cable

length, until it caught up with and matched revolutions of the planet - or

just collided with the pier?



Surely, it is a servo firmware "oversight", not to do a modulo-24 hour

check before resuming from STOP (with no saved Power-off, or Park

coordinates saved in EPROM memory). That is scary, though it is likely a

very rare exception - I ALWAYS Park the mount.

Then again, it only takes one absent minded act, like leaving the mount

idling in Stop, when going inside to answer the phone and not returning.

Could happen.



If you run with the ASCOM driver, and click on STOP Tracking on its

panel, then go away from the actively running "planetarium program", for a

few days - will it do the same, upon the next GOTO ? I hope not, but it

really is no different than the Keypad situation here.



Can this exception be fixed in a future firmware download, or would it

require a new S-chip upgrade and installation?



Meantime, thanks to both, for the heads up warning.



Joe



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

From: chris1011@...

Sent: Monday, July 29, 2013 12:48 PM

To: ap-gto@yahoogroups.com

Subject: Re: [ap-gto] Re: 900GTO slews 96hrs/1440degrees on GOTO





This scenario will work fine. In stopped mode or in Park mode, the mount

servo keeps track of where the mount is pointed, so no loss of position

occurs.



Rolando



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

#41279 Jul 29, 2013

Hi Howard:

"AP Timer. sounds like a very useful tool. However, I don.t see it in my Astro-Physics>ASCOM folder; is it available somewhere else?



Clear Skies,

Gregg



Visit my astronomy site:

www.ruppel.darkhorizons.org





From: Howard

Sent: Monday, July 29, 2013 1:46 PM

To: ap-gto@yahoogroups.com

Subject: RE: [ap-gto] Re: 900GTO slews 96hrs/1440degrees on GOTO





May I refer you to the "AP Timer", one of the little gems that Ray includes with the AP V2 ASCOM Driver You can always simply start the timer as part of your normal startup routine and set it to automatically park the following morning if a more traditional shutdown hasn't already occurred. Check your Start>Programs>Astro-Physics>ASCOM Driver folder.



Mag. 7 Skies!



Howard Hedlund

Astro-Physics, Inc.

Phone: 815-282-1513

www.astro-physics.comwww.astro-physics.com/>

Please include this e-mail with your response.



P Consider the environment before printing this e-mail.



From: mailto:ap-gto%40yahoogroups.com [mailto:mailto:ap-gto%40yahoogroups.com] On Behalf Of Joseph Zeglinski

Sent: Monday, July 29, 2013 2:37 PM

To: mailto:ap-gto%40yahoogroups.com

Subject: [ap-gto] Re: 900GTO slews 96hrs/1440degrees on GOTO



Rolando,



It sounds like there needs to be a warning in the user manual, to always

Power off (or Park) the mount - either at end of session, or if left idling

for some time, Park before resuming use.



If it was "left idling", as he said he did, for a few weeks, or a

month, the mount would corkscrew the entire length of remaining cable

length, until it caught up with and matched revolutions of the planet - or

just collided with the pier?



Surely, it is a servo firmware "oversight", not to do a modulo-24 hour

check before resuming from STOP (with no saved Power-off, or Park

coordinates saved in EPROM memory). That is scary, though it is likely a

very rare exception - I ALWAYS Park the mount.

Then again, it only takes one absent minded act, like leaving the mount

idling in Stop, when going inside to answer the phone and not returning.

Could happen.



If you run with the ASCOM driver, and click on STOP Tracking on its

panel, then go away from the actively running "planetarium program", for a

few days - will it do the same, upon the next GOTO ? I hope not, but it

really is no different than the Keypad situation here.



Can this exception be fixed in a future firmware download, or would it

require a new S-chip upgrade and installation?



Meantime, thanks to both, for the heads up warning.



Joe



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

From: mailto:chris1011%40aol.commailto:chris1011%40aol.com>

Sent: Monday, July 29, 2013 12:48 PM

To: mailto:ap-gto%40yahoogroups.commailto:ap-gto%40yahoogroups.com>

Subject: Re: [ap-gto] Re: 900GTO slews 96hrs/1440degrees on GOTO



This scenario will work fine. In stopped mode or in Park mode, the mount

servo keeps track of where the mount is pointed, so no loss of position

occurs.



Rolando



[Non-text portions of this message have been removed]











[Non-text portions of this message have been removed]







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

#41281 Jul 29, 2013

Gregg,



Download the current version of the AP V2 ASCOM driver:

www.gralak.com/apdriver It currently is v5.05.13.



Regards,



George



George Whitney

Astro-Physics, Inc.

Phone: 815-282-1513

Email: george@...



From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com] On Behalf Of Gregg Ruppel

Sent: Monday, July 29, 2013 3:46 PM

To: ap-gto@yahoogroups.com

Subject: Re: [ap-gto] Re: 900GTO slews 96hrs/1440degrees on GOTO







Hi Howard:

"AP Timer. sounds like a very useful tool. However, I don.t see it in my Astro-Physics>ASCOM folder; is it available somewhere else?



Clear Skies,

Gregg



Visit my astronomy site:

www.ruppel.darkhorizons.org



From: Howard

Sent: Monday, July 29, 2013 1:46 PM

To: ap-gto@yahoogroups.commailto:ap-gto%40yahoogroups.com>

Subject: RE: [ap-gto] Re: 900GTO slews 96hrs/1440degrees on GOTO



May I refer you to the "AP Timer", one of the little gems that Ray includes with the AP V2 ASCOM Driver You can always simply start the timer as part of your normal startup routine and set it to automatically park the following morning if a more traditional shutdown hasn't already occurred. Check your Start>Programs>Astro-Physics>ASCOM Driver folder.



Mag. 7 Skies!



Howard Hedlund

Astro-Physics, Inc.

Phone: 815-282-1513

www.astro-physics.comwww.astro-physics.com/>

Please include this e-mail with your response.



P Consider the environment before printing this e-mail.



From: mailto:ap-gto%40yahoogroups.com [mailto:mailto:ap-gto%40yahoogroups.com] On Behalf Of Joseph Zeglinski

Sent: Monday, July 29, 2013 2:37 PM

To: mailto:ap-gto%40yahoogroups.com

Subject: [ap-gto] Re: 900GTO slews 96hrs/1440degrees on GOTO



Rolando,



It sounds like there needs to be a warning in the user manual, to always

Power off (or Park) the mount - either at end of session, or if left idling

for some time, Park before resuming use.



If it was "left idling", as he said he did, for a few weeks, or a

month, the mount would corkscrew the entire length of remaining cable

length, until it caught up with and matched revolutions of the planet - or

just collided with the pier?



Surely, it is a servo firmware "oversight", not to do a modulo-24 hour

check before resuming from STOP (with no saved Power-off, or Park

coordinates saved in EPROM memory). That is scary, though it is likely a

very rare exception - I ALWAYS Park the mount.

Then again, it only takes one absent minded act, like leaving the mount

idling in Stop, when going inside to answer the phone and not returning.

Could happen.



If you run with the ASCOM driver, and click on STOP Tracking on its

panel, then go away from the actively running "planetarium program", for a

few days - will it do the same, upon the next GOTO ? I hope not, but it

really is no different than the Keypad situation here.



Can this exception be fixed in a future firmware download, or would it

require a new S-chip upgrade and installation?



Meantime, thanks to both, for the heads up warning.



Joe



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

From: mailto:chris1011%40aol.commailto:chris1011%40aol.commailto:chris1011%40aol.com%3cmailto:chris1011%40aol.com>>

Sent: Monday, July 29, 2013 12:48 PM

To: mailto:ap-gto%40yahoogroups.commailto:ap-gto%40yahoogroups.commailto:ap-gto%40yahoogroups.com%3cmailto:ap-gto%40yahoogroups.com>>

Subject: Re: [ap-gto] Re: 900GTO slews 96hrs/1440degrees on GOTO



This scenario will work fine. In stopped mode or in Park mode, the mount

servo keeps track of where the mount is pointed, so no loss of position

occurs.



Rolando



[Non-text portions of this message have been removed]



[Non-text portions of this message have been removed]







[Non-text portions of this message have been removed]



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

#41343 Aug 1, 2013

Hi Everybody,



I wanted to post this response earlier but needed to verify it first. Since Chris' problem was from several days of sitting idle, I wanted to give the system at least two days for my test. At any rate, as I suspected, this issue will NOT occur in firmware Rev. S and later. We had discovered a slightly different, but related behavior in our early beta testing of S and had fixed it long before the actual public release of the S chip in anticipation of APCC. That fix also eliminates the rather obscure discovery that Chris Erickson made.



Either way, PLEASE FOLLOW ROLAND'S SUGGESTION! If you will be leaving the mount sitting powered on for an extended period of time, please place it into a parked state. With the keypad, use a park position. DO NOT press any further keypad buttons. With the AP V2 ASCOM Driver, you can choose to park at current position, or pick a pre-defined position. To unpark with the keypad in this situation, simply press the menu button to exit the park screen. In the driver, unpark from last parked.



In all cases, the safest thing to do if you will be leaving the mount for a while is to power the system down.



Howard

--- In ap-gto@yahoogroups.com, chris1011@... wrote:

>

>

> Stop is not the same thing as park. Indeed the mount will accumulate 4 days of motion when in the stopped mode, and when you slew it will try to compensate for that.

>

> To really stop the mount with power still on, you have to initiate a proper Park command, which can be done via the Ascom driver. Or you can send it to one of the 3 park positions via the keypad.

>

> Rolando

>

>

> -----Original Message-----

> From: Christopher Erickson christopher.k.erickson@...>

> To: ap-gto ap-gto@yahoogroups.com>

> Sent: Sun, Jul 28, 2013 1:16 am

> Subject: [ap-gto] 900GTO slews 96hrs/1440degrees on GOTO

>

>

> As part of my personal learning curve, I have my 900GTO/GTOCP3/Q/4.17 set up

> next to my desk. No OTA or counterweight shaft.

>

> Four days ago I used the hand controller to set the tracking rate to "stop"

> and have had the mount idling with the power on from then to now.

>

> Today I used the hand controller to change the tracking rate from "Stop" to

> "Side" and then commanded the mount to slew to Mercury which should have

> been very-close to where it was currently pointing.

>

> To my surprise, the RA axis did four complete revolutions before pointing

> towards Mercury.

>

> I had assumed that the mount would automatically subtract 24hrs/360deg from

> the current RA position whenever it exceeded 24hr/360deg.

>

> I assume this isn't a bug so I am looking for some insight on the logic

> behind this behavior so I can better-understand my mount and how to use it

> most safely and effectively.

>

> Thanks for reading!

>

> Christopher Erickson

> Consulting Engineer

> Summit Kinetics

> Waikoloa, HI 96738

> www.summitkinetics.com

>

>

>

>

>

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

>

> To UNSUBSCRIBE, or for general information on the ap-gto list

> see groups.yahoo.com/group/ap-gtoYahoo! Groups Links

>

>

>

>

>

>

>

> [Non-text portions of this message have been removed]

>







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

#41344 Aug 1, 2013

Excellent news! Thanks!



Christopher Erickson

Consulting Engineer

Summit Kinetics

Waikoloa, HI 96738

www.summitkinetics.com







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

From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com] On Behalf Of

Howard

Sent: Thursday, August 01, 2013 8:32 AM

To: ap-gto@yahoogroups.com

Subject: [ap-gto] Re: 900GTO slews 96hrs/1440degrees on GOTO



Hi Everybody,



I wanted to post this response earlier but needed to verify it first.

Since Chris' problem was from several days of sitting idle, I wanted to give

the system at least two days for my test. At any rate, as I suspected,

this issue will NOT occur in firmware Rev. S and later. We had discovered

a slightly different, but related behavior in our early beta testing of S

and had fixed it long before the actual public release of the S chip in

anticipation of APCC. That fix also eliminates the rather obscure

discovery that Chris Erickson made.



Either way, PLEASE FOLLOW ROLAND'S SUGGESTION! If you will be leaving the

mount sitting powered on for an extended period of time, please place it

into a parked state. With the keypad, use a park position. DO NOT press

any further keypad buttons. With the AP V2 ASCOM Driver, you can choose to

park at current position, or pick a pre-defined position. To unpark with

the keypad in this situation, simply press the menu button to exit the park

screen. In the driver, unpark from last parked.



In all cases, the safest thing to do if you will be leaving the mount for a

while is to power the system down.



Howard

--- In ap-gto@yahoogroups.com, chris1011@... wrote:

>

>

> Stop is not the same thing as park. Indeed the mount will accumulate 4

days of motion when in the stopped mode, and when you slew it will try to

compensate for that.

>

> To really stop the mount with power still on, you have to initiate a

proper Park command, which can be done via the Ascom driver. Or you can send

it to one of the 3 park positions via the keypad.

>

> Rolando

>

>

> -----Original Message-----

> From: Christopher Erickson christopher.k.erickson@...>

> To: ap-gto ap-gto@yahoogroups.com>

> Sent: Sun, Jul 28, 2013 1:16 am

> Subject: [ap-gto] 900GTO slews 96hrs/1440degrees on GOTO

>

>

> As part of my personal learning curve, I have my 900GTO/GTOCP3/Q/4.17 set

up

> next to my desk. No OTA or counterweight shaft.

>

> Four days ago I used the hand controller to set the tracking rate to

"stop"

> and have had the mount idling with the power on from then to now.

>

> Today I used the hand controller to change the tracking rate from "Stop"

to

> "Side" and then commanded the mount to slew to Mercury which should have

> been very-close to where it was currently pointing.

>

> To my surprise, the RA axis did four complete revolutions before pointing

> towards Mercury.

>

> I had assumed that the mount would automatically subtract 24hrs/360deg

from

> the current RA position whenever it exceeded 24hr/360deg.

>

> I assume this isn't a bug so I am looking for some insight on the logic

> behind this behavior so I can better-understand my mount and how to use it

> most safely and effectively.

>

> Thanks for reading!

>

> Christopher Erickson

> Consulting Engineer

> Summit Kinetics

> Waikoloa, HI 96738

> www.summitkinetics.com

>

>

>

>

>

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

>

> To UNSUBSCRIBE, or for general information on the ap-gto list

> see groups.yahoo.com/group/ap-gtoYahoo! Groups Links

>

>

>

>

>

>

>

> [Non-text portions of this message have been removed]

>









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



To UNSUBSCRIBE, or for general information on the ap-gto list

see groups.yahoo.com/group/ap-gtoYahoo! Groups Links







-----

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