Telescope Motion Failure(s)
Wednesday, February 19, 2020 7:25 AM
When we began astronomical observations, we slewed to the nearest bright star and noticed that it had not been acquired.
After trying a few commanded slews to other positions near the zenith, we noticed that the brake was engaged, and was a likely culprit for our pointing issues.
Among the problems we had noticed was that slews were not being properly completed (as one might expect, given that the brake was engaged!)
Since we were near zenith, we sent a command to disengage the brake.
At that point the telescope slewed to a position at dec +88 and hour angle ~2. We don't know why this occurred, as we had not entered any targets with coordinates near that region.
Subsequently the telescope would not respond to any commands to move (slews, zenith command, paddle)
We tried restarting the TCS program but also no change. Eventually we decided to end observations for the night.
Blown drive fuse. Replaced and all seems ok.