AF2 Removal document

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Tick below when all sections are completed

Shutting Down the Control Room Systems

1.       Fill in the telescope log book to not move the telescope.
2.       If not already done, type on the observing system: af2 allpark  This will put all the fibres into the outer ring, were they have better support, to prevent movement handling the fibre module.
3.       Make sure the robot is slept by typing: af2 sleep ,before proceeding with instrument change. This will park the robot and turn the power off.
4.       Turn off AF2 video monitor.
5.       Shutdown the two AG camera servers
6.       Shut down the observing system.
   

Removing the AF2 Control System from GHRIL (if nessecary).

1.      Power off the robot by disconnecting the mains power cable at AP3 (Cable AF2-C14, marked with MAINS on the robot panel).
2.      Power off the AF2 servo amplifier rack and AF2 Interconnect Module ICM1900.
3.       If the instrument is being used in the test focal station the following has to be done, otherwise continue with section 3.
   
4.       Shutdown and power off the AF2 PC.
5.       Remove the video display connection from the GHRIL patch panel. This is Video=82.
6.       Uncable the AF2 amplifiers, AF2 Interconnect Module ICM1900 and the AF2 PC.
7.       Take care with 2 100pin interconnection cables between the PC and the Interconnect module, as they are very delicate.
   
8.       Remove the AF2 PC ('s), AF2 Interconnect Module ICM1900 and Servo amplifier crate from the rack.
   

Telescope Preparation 

1.       Before you bring down the telescope take the facetblock of with the fibres out of wyffos and out of the altitude cable wrap.
2.       Lay the fibres and facet block on top of GHRIL
3.       Bring the telescope to access park and fit the ties.
4.       Position rotator with the top mark on AF2 at the top of the rotator.
5.       At the PFIP controller on the top end ring turn both power switches to the off position.

1.       Turn the powersupply to SDSU off.
2.       Take AG1 head off and store in detector lab
3.       Remove the autoguider cabling and store in the autofib cabinet.
4.       Remove the powersupply and SDSU controller

Removal of the AG2 autoguider head

1.        Turn the powersupply to SDSU off.
2.        Take AG2 head off and store in detector lab
3.        Leave bracket on the telescope

Make sure you use a safety harness when decabling on top ring.

1.       Take off cable ties that hold the fibres and cables
2.       Carefully remove the fibres from the telescope and lay flat and straight on the dome floor.
3.       Remove the swan neck from the telescope and store in the dome area.
4.       Fit the grey reels on the back of the fibre module to wind up the fibres
5.       Bring the fibres and facet block down to the dome floor from GHRIL
6.       Roll the science fibres on the reels and secure the facet block on its support.
7.       Undo the fiducial bundle from the camera support and roll up at the back of the fibre module aswell
8.       Using three people, take the weight of the fibre module and unbolt it.
9.       Remove the fibre module and put into its aluminium storage case.
10.       Store the 4 bolts with the special centering spacers in the appropiate box in the mechanical tool trolley.
    

Removal of Ancillary Items

1.       Disconnect all cables to AF2 and store in the AF2 cabinet.
2.       Disconnect the air line from AF2 and store in the AF2 cabinet.

1.       Attach the AF2 lifting frame to the AF2 robot and support using the crane.
2.       Remove the bolts attaching AF2 to prime.
3.       Lift the AF2 robot to the basement and place it into its handling trolley.
4.       Fit the AF2 cover to protect the robot.

1.       Fit the cover onto the prime focus rotator lens.
2.       Turn the power off to the prime focus unit in the control room.
3.       Uncable the prime focus unit.
4.       Check that the lifting frame centre of gravity is correct for the prime focus rotator.
5.       Attach the lifting frame to the prime focus rotator and take the weight using the crane.
6.       Unbolt the prime focus rotator and crane it into its handling frame in the basement.

Fitting the Secondary Mirror

1.       Crane up to the dome the secondary mirror.
2.       Bolt the secondary mirror on to the telescope and tighten the top two bolts that are used to locate it. DO NOT TOUCH THE BOTTOM TWO LOCATION BOLTS.
3.       Remove the lifting frame.
4.       Connect the power supply cable and the three LVDT cables.
5.       Remove the mirror cover.
6.       Check that the cabling is secure and pay particular attention that there is nothing behind the balance weights of the secondary, as these move in and out during use.
7.       Fit the baffle, taking care not to catch the mirror or trap any cables.
8.       Check the area to ensure that there are no loose components.

1.       Release telescope ties when you are sure telescope is near to balance and slightly bottom end heavy.
2.       Turn on the power to the flip ring. The switch is on the ring.
3.       Put the telescope back to zenith.
4.       Flip the ring.
5.       Bring the telescope back to access park.
6.       Turn off the power to the flip ring.
7.       Fit the cover to the front of the baffle.
8.       Put the telescope back to zenith.

1.       Paper calculation on moments removed and added.
2.       Check top to bottom
3.       Check across cube
4.       Check top to bottom

1.       Turn the power on to the prime focus in the control room.
2.       Using the TCS, move the focus through its full range using <focus>. The range is 34.5 to115.
3.       Using the <page> command in the TCS, check that the three LVDT's work correctly. These should have a reading of between -100 and +100.

1.       Check that all AF2 cabling and equipment is accounted for in the AF2 cabinet.
2.       Tidy up!

Last updated 21st May 2015 by RJP