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What would make the Gemini2 slew in the RA axis on its own while guiding?

0 votes
After imaging for a while (about 1/2 hour or so), the Gemini will slew all the way to the limits in the RA axis, I have changed the battery in the unit (was 2.6v now reads 3.2v), the main power reports 13.6v. I believe all the software is current. I have even changed and manually flashed the micro-sd cards. It started doing this about 6 months ago and the only way to stop this is to do a cold reboot, this solution only works for a while and then it will do it again. It started doing this while I was using PHD2 for guiding, so I switched to PHD and that seem to work for a couple of months, but now it wants to do it with PHD also. With PHD2 it will do this while it is calibrating.
asked Aug 30 by Jeff C (120 points)

1 Answer

0 votes
An uncontrolled slew is usually due to some encoder signals not reaching Gemini from the motor(s). Gemini thinks the motor is not responding or responding too slowly, and applies more and more power to it, resulting in a fast slew. Places to check would be the cables and cable connectors. If these are OK, then the motors themselves and their encoders might be faulty or making intermittent contact.
answered Nov 26 by paul_kanevsky (4,090 points)
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