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Photo copy this document and tick off check list. When instrument change is complete place in
operations room instrument change filing cabinet.

There is supporting information available on the AF2 web site, which can be accessed from the intranet.  This includes photo's of the change and an AF2/WYFFOS schematic.
 

Date of Instrument Change

Date:
 

Change Team

Change Leader:

Electronics Engineer 1:

Electronics Engineer 2:

Mechanical Engineer 1:

Mecahnical Engineer 2:

Astronomer:

Index

1. PREPARATION (IF OBSERVING SCHEDULE ALLOWS).
1.1 Check that GHRIL is prepared
1.2 Check that the prime focus unit is prepared.
1.3 Check AF2
1.4 Check ancillary equipment.
1.5 Check lifting equipment.
1.6 Check that control room is prepared
2. TELESCOPE PREPARATION.
3. SECONDARY MIRROR REMOVAL.
4. FITTING PRIME FOCUS UNIT.(PFU)
5. FITTING AF2 ROBOT
6. FITTING FIBRE MODULE
7. FIT ANCILLARY ITEMS AT TOP END
8. CABLE-UP TOP END.
9. CONNECT UP SCIENCE AND GUIDE TV FIBRES.
10. BALANCE TELESCOPE.
11. DOES IT ALL WORK?
11.1 Engineering checks
11.1.1 From GHRIL in engineering mode.
11.1.2 From control room
11.2 Astronomy day time checks
11.3 Astronomy night time checks
 

AF2 Equipment

• AF2 VME crate.
• AF2 servo control amplifier rack.
• AF2 Robot.
• Large fiber module.
• Small fiber module-not available yet.
• Small video monitor for GHRIL.
• Large video monitor for control room
• VT220 terminal.
• RGB Engineering mimic.
• Auto guider fiber back illumination/Westinghouse TV system.

AF2 Cables

• 240V power cable to robot.
• Cable loom from robot to telescope.
• Utility network cable.
• VT220 cable.
• Ethernet network cable.
• BNC monitor cable complete with tee adapter.
• Cable to connect AF2 VME crate to AF2 servo amp.
• BNC RGB+sync cable for engineering mimic.
• Cable to connect Westinghouse TV back illumination to telescope top ring patch panel

Notes

The gripper TV is used for enabling the robot to `see' the fibres and the inspection TV can be used to
allow the user to see inside the robot enclosure.

The control signals to/from the robot are connected into the bottom of AF 2 along with the
cable from the power amplifiers and the TV cables.

The science fibres are carried in blue cables, which are coiled up on the fibre module.  All these cables are run in the `swan neck' up to the top end ring along with the guidefibres which are carried in a black cable and also coiled onto the fibre module.

Fitted at the top end ring is a Westinghouse TV and an interface box.

Before the day of the instrument change.

1.1 Check that GHRIL is prepared

• Internal inspection of WYFFOS. Clean inside and ensure fibre bundle is connected to the slit.
• Check engineering schedule.  Set-up WYFFOS for correct mode (reflection or echelle).
• Set up AF2 micro/electronics and power supplies in GHRIL control room.
• Check WYFFOS CCD is prepared and cold, cycle if required.
• Ensure clear access is available for WYFFOS grating.
• Check WYFFOS is operational and all maintenance etc is complete.
• Check WYFFOS Calibration Unit is operational and all maintenance etc is complete.

• Connect the AF2 cable loom from prime to AF2 VME crate and AF2 servo amp crate.
• Connect the AF2 servo amp crate to the AF2 VME crate.
• Engineering mimic connections from AF2 VME crate to patch panel: red=26, green=87, blue=62, sync=88.
• Gripper camera from AF2 VME crate to patch panel using a BNC T connector: video=82.  Connect the small AF2 video monitor to this.
• AF2 NIU connection to NIU port 1 on the patch panel.
• NIU port 2 to Prime port 2 on the patch panel for the autoguider.
• AF2 VT220 monitor to AF2 VME crate.

1.2 Check that the Prime Focus Unit is prepared.

• Check the Prime Focus Unit is in its handling trolley and ensure that the prime focus instrument platform PFIP has been removed
• Ensure the lifting frame is correctly balanced for lifting the Prime Focus unit.

1.3 Check AF2

• Carefully place the fibre module into its storage box.
• Remove AF2 from its handling trolley and put it in its lifting frame.
• Prepare AF2 and the fibre module for lifting up to the dome area in the morning.

1.4 Check Ancillary equipment.

• Check you have a working autoguider head and controller.
• Check you have a working Westinghouse camera.
• With the telescope at zenith park check flip ring operation.
• Locate swans neck and CCD controller racks.
• Check that all cables are accounted for.

1.5 Check lifting equipment

• Two one tonne strops and shackles required.
• Looking down from AP3. Place the following trolleys on the ground floor to the right of the telescope. Secondary Lifting Trolley and frame, Prime Focus Unit, AF2 robot in its handling trolley.

• Connect AF2 video monitor to GHRIL patch panel: video=82.
• Connect AF2 engineering mimic monitor to GHRIL patch panel: red=26, green=87, blue=62, sync=88.

Preparation complete

Date____________

Signed__________________

2. Telescope Preparation.

In control room:

• Check Logbook for any restrictions or on going work.
• Make entry in the logbook and apply any necessary restrictions or permit locks.
• Turn on oil systems and Altitude and Azimuth power amps.

• 1=prime A/G
• 2=A/G 2 engineering
• 3=CCD engineering
• 4=4MS
• 5=speaker

• Prime 1 connects to A/G fox crate

• Bring telesope down to AP1 and check that the flip ring is turned on.
• Send telescope back to zenith park.
• At zenith park flip top ring to prime focus position.
• Bring telescope down to AP3.
• Put in both AP3 telescope ties.

NB Do not turn of oil system.
 

3. Secondary Mirror Removal.

• Remove Secondary Baffle
• Un-cable secondary Mirror power supply cable and the 3 LVDT's.
• Back off and secure with lock nut, the two top bolts that position the secondary mirror in X,Y translation. Never loosen the bottom two bolts, as you will loose alignment.
• Fix lifting frame remove bolts and lift to the ground floor.

4. Fitting Prime Focus Unit.(PFU)

NB great care must be taken when placing the PFU in the telescope. This is because the crane beam
and telescope axes are not orthogonal.

• Check that the lifting frame centre of gravity is correct for the PFU.
• Lift Unit from Ground floor.
• Secure PFU to telescope with six bolts.
• Lower PFU lift frame to ground floor.
• Connect cables from telescope to PFU.
• Turn on PFTT power amp in control room and ensure you can rotate the PFU locally.

5. Fitting AF2 Robot

• Lift AF2 robot from the ground floor to AP3.
• Offer AF2 up to PFU unit. Move PFTT until the dowels align.
• Secure AF2 to the PFU.
• Are all bolts tight?
• Lower lifting frame to the ground floor.
• Fit robot cables between AF2 and top ring patch panel.
• Connect compressed air supply to robot.
• Cover small or large fibre module sensor (depending on which fibre module is being fitted.) with a piece of metal.
• Ensure all staff are clear from the robot, as it can move without warning.

• Turn on AF2 control system.
• OS9> eng
• eng> local
• eng> wake
• If AF2 wakes, then you will hear the gripper jaws actuate 3 times.
• eng> sleep
• Turn off AF2 control system.
• Remove the metal from the fibre module sensor.

6. Fitting Fibre Module

• Two people lift the fibre module out of its box.
• Lift the fibre module on to the AF2 robot.
• Fit the spacers between the robot and the fibre module.
• Secure the fibre module with four cap head bolts and self-aligning washers.

7. Fit Ancillary items at top end

• Fit the swans neck.
• Fit A&G controller support frame and install CCD controller.
• Place the top end ring working platform in place and bolt down
• Install Westinghouse TV system.

8. Cable-UP Top end.

• Prime Focus Unit to AF2 Robot, A/G Controller, A/G Head.
• Dry Air feed to A/G head.
• Cable up Autoguider.  Fibre connects to prime 1.
• Connections to the Westinghouse TV and interface box

9. Connect up Science and Guide TV fibres.

• Clear area and ensure only change staff are present.
• Lay out all the fibres on the floor.
• Run the blue science fibres from AF2 up to the break out plate.
• Run the black guide fibre in the up to the Westinghouse TV.
• Great care must be take when handling the fibres.
• Using cable ties secure all the fibres ( where the metal connector joins the grey mesh) at the end of the swan's neck. Ensure the cable ties are on the metal part not on the grey mesh.
• Ensure the black fibre storage centre section gaps are taped up so there is a continuous circle, so no fibre can snag.
• Very important. Move rotator locally to +/- limits. Check fibres twist OK. When A&G is at the top the rotator PA should be 90 degrees.
• Remove top end ring working platform.

10. Balance Telescope.

• Drive weights to the bottom.
• Paper calculation on moments removed and added.
• Release telescope ties when you are sure telescope is near to balance and slightly bottom end heavy.
• Check top to bottom
• Check across cube
• Check top to bottom

11. Does it all work?

11.1 Engineering Checks

11.1.1 From GHRIL in Engineering mode.

Start AF2 Micro.

• Re-boot
• OS9> eng
• eng> local
• eng> wake
• If it wakes you will hear the gripper jaws actuate 3 times.
• eng> sleep
• eng> wake
• The system is alive and talking.

• eng> backillum on
• eng> viewfibre 16
• If you see 16 in the centre of this science fibres is OK form AF2 to WYFFOS.
• eng> viewfibre 15
• If you see 15 the guidefibre from AF2 to the Westinghouse TV is OK.
• eng> loadmodule
• If the system completes a load module then AF2 robot and backillumination and fibre system to WYFFOS is OK.
• eng> remote
• System can now be operated from ICL.
• eng> quit

11.1.2 From Control room

• Start ICL and configure for WYFFOS.
• When TCS comes up Select Prime AF2 rotator
• Check rotator limits + - Send to a cardinal point i.e. 90 degrees. Look at robot it should be Orthogonal
• Now carry out AF2/WYFFOS duty Checks.

11.1.3 Duty Checks

• Autofib 2.
• Westinghouse TV.
• WYFFOS instrument.
• Atmospheric Dispersion Corrector.
• WYFFOS CCD.
• Autoguider.
• WYFFOS Calibration Unit.
• Telescope Broken Cass Selector.

11.2 Astronomy Checks (day time)

• AF2 field set-up from ICL.
• CCD focus.
• Check that WYFFOS angle offset is 6200 (wchange).
• Datum the two filter slides and lamp slide on the Calibration Lamp Mimic.
• Set calibration lamp timeout to 1800 seconds on the Calibration Lamp Mimic.

Engineering Checks and Astronomy day time checks complete

Signed Instrument Change leader___________________________ date/time

11.3 Astronomy night time checks

• Check offsets on mobile and fixed probe. (see Autofib technical note 2. Section 6)

Instrument Change complete

Signed Duty Officer _________________________________________ date/time

Created by Stephen Goodsell sjg@ing.iac.es Last updated 9/01