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Re: G11 RA motor is stalls when tracking but not when slewing

 

Hi Eric,

The most common reason is a loose Oldham coupler part.

Look at the drive metal parts of the RA Oldham coupler...see if one end is loose. They can get loose over time, and it might be temperature dependent.? If one of those ends gets loose, the motor will tell Gemini it is still turning (so no Lags message), but the worm will not be driven..so the axis will not move.

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I was going to say:

Try swapping the cables from RA to DEC (...the RA is shorter...might be difficult).

However, if the cable were faulty, I think the Gemini would say "Lags" or something like that.? I think the Oldham coupler is the most likely trouble.

Best wishes,
Michael


On Sun, Sep 22, 2019, 12:27 PM Erik Nordberg <tierozi@...> wrote:
Hi friends !
I have had a problem the last couple of years with the RA motor that stops working when tracking at star but when hitting the slew buttons on the hand controller the works as usual.
There is no stall warning in the display.
Often I can get it working again after pushing the buttons on the handcontroller but last night it did not work that way. I even shut down Gemini twice and after a restart the star was
OK and not drifting but when I center the star it immediatly starts drifting which means the RA motor has stopped. And never a stall warning in the display.
I know the that the stall warning does work when for example I adjust the wormwheel.
Is this a problem that any of you guys has encountered before ?
Rgds
Erik Nordberg

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