Re: 900 Mount out of control


Jun 25, 2012

 


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

#37121 Jun 25, 2012

Hello Everyone,



My astronomy's club AP 900 GTO with GTOCP2 controller and keypad v4.12 has done something strange the last 2 Saturday nights I used the mount.

The mount is located in a 16' Ash observatory and has a hefty 12VDC power supply with a voltage output of 13VDC so I know power is not the issue. Here is what happens.

Power on the mount and everything comes up.

Goto an object the the mounts slews at it's max. slew rate to wrong position and causes the scope to hit the pier. The 2nd Saturday I pressed Stop to stop the mount. When I tell the mount move using the hand controller NSEW buttons it moves at the 1200 rate instead of the 64x I have set. I changed the slew rate to 600x and do a part but the mount still slews at 1200x. Move rate of 600x and 900x does not work the mount slews at 1200. When I part the mount and let it stop both axis are off by a lot. At this point I turn off the mount and loosen the clutches and move it to the correct part position. Power the mount back on and now everything works. Any ideas?



Thanks,

William Rison



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

#37122 Jun 25, 2012

Hi Bill,



Please call me at AP to discuss this. What is the mount's serial number? Do you know which chip version is in the GTOCP2? A runaway condition like that is often related to a problem somewhere in the servo feedback loop. We can systematically do some tests to narrow it down.



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

Sent: Monday, June 25, 2012 9:51 AM

To: ap-gto@yahoogroups.com

Subject: [ap-gto] 900 Mount out of control







Hello Everyone,



My astronomy's club AP 900 GTO with GTOCP2 controller and keypad v4.12 has done something strange the last 2 Saturday nights I used the mount.

The mount is located in a 16' Ash observatory and has a hefty 12VDC power supply with a voltage output of 13VDC so I know power is not the issue. Here is what happens.

Power on the mount and everything comes up.

Goto an object the the mounts slews at it's max. slew rate to wrong position and causes the scope to hit the pier. The 2nd Saturday I pressed Stop to stop the mount. When I tell the mount move using the hand controller NSEW buttons it moves at the 1200 rate instead of the 64x I have set. I changed the slew rate to 600x and do a part but the mount still slews at 1200x. Move rate of 600x and 900x does not work the mount slews at 1200. When I part the mount and let it stop both axis are off by a lot. At this point I turn off the mount and loosen the clutches and move it to the correct part position. Power the mount back on and now everything works. Any ideas?



Thanks,

William Rison







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



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

#37149 Jun 26, 2012

Hello Howard,



The serial number 900201 chip version id D.

The next time this happens what should I try before power cycling the mount?



Thanks,

William

--- In ap-gto@yahoogroups.com, Howard howard@...> wrote:

>

> Hi Bill,

>

> Please call me at AP to discuss this. What is the mount's serial number? Do you know which chip version is in the GTOCP2? A runaway condition like that is often related to a problem somewhere in the servo feedback loop. We can systematically do some tests to narrow it down.

>

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

> Sent: Monday, June 25, 2012 9:51 AM

> To: ap-gto@yahoogroups.com

> Subject: [ap-gto] 900 Mount out of control

>

>

>

> Hello Everyone,

>

> My astronomy's club AP 900 GTO with GTOCP2 controller and keypad v4.12 has done something strange the last 2 Saturday nights I used the mount.

> The mount is located in a 16' Ash observatory and has a hefty 12VDC power supply with a voltage output of 13VDC so I know power is not the issue. Here is what happens.

> Power on the mount and everything comes up.

> Goto an object the the mounts slews at it's max. slew rate to wrong position and causes the scope to hit the pier. The 2nd Saturday I pressed Stop to stop the mount. When I tell the mount move using the hand controller NSEW buttons it moves at the 1200 rate instead of the 64x I have set. I changed the slew rate to 600x and do a part but the mount still slews at 1200x. Move rate of 600x and 900x does not work the mount slews at 1200. When I part the mount and let it stop both axis are off by a lot. At this point I turn off the mount and loosen the clutches and move it to the correct part position. Power the mount back on and now everything works. Any ideas?

>

> Thanks,

> William Rison

>

>

>

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

>







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