GAM Testing

Date

20230323T1215-

People

obs/astropol: Roy, Meyer, Onkar, David, Nathan

newspeople: 2

Spaces

433C, Dome

Goals

1. test gam

2. issue motor commands

Log

1. Start Up

   1. opened hatch 

   2. ran new gam cable from telescope gam cable to control room where gam is

   3. opened dfm tcs

   4. turned on drives, mtr drive chasis, unhalted motors

   5. no joy in success issuing commands from dfm tcs

2. restart

   1. closed dfm tcs

   2. flipped switches off on mtr driver chasis

   3. turned off and then back on gam switch

   4. reopened dfm tcs

   5. flipped on switches on mtr driver chasis

   6. dfmtcs→telescope→gam→communication

   7. gam communication status: "Success" and south filter wheel updated after manually moving it from position 3 to position 4

3. Testing encoders over 37-pin cable

   1. Encoders going over 37-pin cable:

      1. South filter wheel position

         1. Manually changed south filter wheel position via wheel

         2. Sent "Update GAM Status" command via GAM panel

         3. It updated to the correct position

         4. Took a few more seconds (5s) to report "Success" in GAM Communication Window

      2. Rotating Mirror Position

         1. Rotating Mirror claims position 5

            1. DFM Manual (pg 21) says this means LOL We don't know. It only supports readouts 0-3 

         2. after rotating in several positions, still reports position 5

         3. cannot get the encoder for this to respond

      3. Translating Stage

         1. when stowed, reports 1

         2. when in center of mirror, reports 2

         3. this is CORRECT according to DFM manual and were checked via the GAM status information section on dfmtcs

4. Testing via multimeter

   1. Translating Stage

      1. PH265L-01B VEXTA Motor

         1. yellow and white are ground/common

         2. other wires are different phases

         3. tested if the motor generates power, it does 5-7 Volts AC

         4. with that being said, might be voltage dropoff at some point in this long a** cable

   2. gam cable - the long one

      1. uninstalled and brought down to control room to test for continuity via multimeter

      2. good continuity in the cables we could test

      3. resistance at 0.7 ohms - basically nothing

5. Next steps

   1. bring GAM into the dome and directly connect to the gam cable (not use gam extension cable) and see if we still get "5" for the rotating mirror positon

   2. also want to test and see if we can issue any motor commands and see something happen

   3. order 14 pin connector for primary filter wheel motor to test

Todo

1. Need to buy AMP 14-pin connector for 2" filter wheel motor

2. Need to buy new belt for 2" filter wheel 

3. Need to buy 25 pin serial connector (DB 25S serial connector)

Note

1. Remote ability to hit reset switch would be nice -meyer

2. referencing chapter 3.9.2.5 in the Telescope Operations Manual

3. referencing GAM WIRING DWG No 349-209 in the DFM Eng Manual