Scope Be Brokt

Attendance Onkar, Gabriel, Shreyansh, Nathan, Meyer, Eric, Roy

Date/Time 12/01/22 12:00-6:00PM

Spaces Occupied: 401, Control Room, Dome

Goals

1. Remove panel for GAM for attaching motor stepper control (Thor)

Other Notes

      How we got there

1. Onkar engaged motors to slew telescope south to expose GAM for easier access to Erik

2. Scope didn't stop at predetermined location communicated by TheSky6

   1. TS6: Crosshairs went past target position and continued moving South

   2. Eileen/Erik tried to get Onkar to stop the motors

   3. "HALT MOTORS" button being IN didn't stop motors

   4. Disengaging "DRIVES" switch also didn't stop the motors

   5. Disengaging "MTR DRIVER CHASSIS" switch DID stop the motors

      1. at this point, fork was bonked by scope so its unclear whether disengaging the previous OR scope fork bonking stopped motion

3. We don't know why this happened.

4. And we couldn't issue further commands to right the telescope

   1. No TCS commands worked

   2. No hand paddle commands worked

   3. No slew commands issued through TS6 worked

5. We aren't SURE, but it seems like the motors would continue to drive if we re-engaged the "DRIVES" and "MTR DRIVER CHASSIS"

   1. We heard a humming sound

      How we fixt it

1. At some point in the above, the "HORIZON LIMIT" LED light went off, interrupting power to the motors

   1. Per "2.3 LIMIT SWITCH" in DFM_Telescope_Manual.pdf on Desktop of DC

2. Before identifying this as the issue, we confirmed that the fuses on the TCS Chassis were good and power cycled TS6 and DFM TCS Software and entire TCS Computer

3. Again, per "2.3 LIMIT SWITCH" in the manual, Erik and Onkar physically pushed the telescope above the horizon with all three switches/buttons disengaged.

   1. In this state, any movement upward wasn't held in place by the motors

4. After "DRIVES" and "MTR DRIVER CHASSIS" were engaged, the telescope was held in place as Onkar and Erik physically pushed the scope above the horizon

   1. Concurrently, the "HORIZON LIMIT" LED light came back on.

5. After the "HORIZON LIMIT" LED was back on, we could issue motor commands from the TCS.

6. We manually moved the telescope to zenith and stowed.

7. TS6 still doesn't report the correct position of the telescope when the link is established.

Todos

• Figure out why this happened

• Figure out what the "HALT MOTORS" button does

• Figure out what the "DRIVES" switch does

• Figure out what the "MTR DRIVER CHASSIS" switch does

• (Consult the manual)