AF2 Change document

Please report any errors or other suggestions to Michiel van der Hoeven

Tick below when all sections are completed

 Preparation (Day Before)

Check that GHRIL is prepared

1. Internal inspection of WYFFOS. Clean inside and ensure fibre bundle is connected to the slit.
2. Check engineering schedule.  Set-up WYFFOS for correct mode (reflection or echelle).
3. Check WYFFOS CCD is prepared and cold, cycle if required.
4. Ensure clear access is available for WYFFOS grating.
5. Check WYFFOS is operational and all maintenance etc is complete.
6. Check WYFFOS Calibration Unit is operational and all maintenance etc is complete.
7. Set up AF2 micro/electronics and power supplies in GHRIL control room.
8. Connect the AF2 cable loom from prime to AF2 VME crate and AF2 servo amp crate.
9. Connect the AF2 servo amp crate to the AF2 VME crate.
10. Engineering mimic connections from AF2 VME crate to patch panel: red=26, green=87, blue=62, sync=88.
11. Gripper camera from AF2 VME crate to patch panel using a BNC T connector: video=82.  Connect the small AF2 video monitor to this.
12. AF2 NIU connection to NIU port 1 on the patch panel.
13. NIU port 2 to Prime port 2 on the patch panel for the autoguider.
14. AF2 VT220 monitor to AF2 VME crate.

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

17. Remove AF2 Robot from its handling trolley and put it in its lifting frame.
18. Prepare AF2 Robot and the small fibre module for lifting up to the dome area in the morning.

19. Check you have a working autoguider AG2 head and controller.
20. Check you have a working TV camera AG1 and controller.
21. With the telescope at zenith park check flip ring operation.
22. Locate swans neck and CCD controller racks.
23. Check that all cables are accounted for.

24. Two one tonne strops and shackles required.
25. 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.

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

Telescope Preparation.

1. Check Logbook for any restrictions or on going work.
2. Make entry in the logbook and apply any necessary restrictions or permit locks.
3. Turn on oil systems and Altitude and Azimuth power amps.
4. Check the following connections at the control room's prime patch panel:
   1. 1=prime A/G
   2. 2=A/G 2 engineering
   3. 3=CCD engineering
   4. 4=4MS
   5. 5=speaker
5. Prime 1 connects to A/G fox crate at the A/G patch panel in the control room.
6. Bring telesope down to AP1 and check that the flip ring is turned on.
7. Take the white dust cover off
8. Send telescope back to zenith park.
9. At zenith park flip top ring to prime focus position.
10. Bring telescope down to AP3.
11. Put in both AP3 telescope ties.

Secondary Mirror Removal.

12. Remove Secondary Baffle
13. Un-cable secondary Mirror power supply cable and the 3 LVDT's.
14. 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.
15. Fix lifting frame remove bolts and lift to the ground floor.

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

Fitting Prime Focus Unit.(PFU)

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

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

16. Telnet 161.72.6.65
17. OS9> eng
18. eng> local
19. eng> wake
20. If AF2 wakes, then you will hear the gripper jaws actuate 3 times.
21. eng> sleep
22. Close telnet session
23. Remove the metal from the fibre module sensor.

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

Fit Ancillary items at top end

5. Fit the swans neck.
6. Fit A&G controller support frame and install SDSU controller.
7. Install  TV camera system with AG1. Make sure the camera sits against the two reference faces. Optimum focus is at 5.42 mm on the micrometer.                         Make sure you use a safety harness!!                   Most of the cable connections and fibre fixing is done using the lifting basket.

8. Prime Focus Unit to AF2 Robot, AG2 acquisition, AG1 tv/autoguiding
9. Cable up Autoguider.  Fibre connects to prime 1.
10. Connections to the AG1 TV and interface

11. Clear area and ensure only change staff are present.
12. Lay out all the fibres on the floor.
13. Take the grey reels off the fibre module and store in cupboard
14. Run the red science fibres from AF2 up to the topring
15. Run the grey guide fibre to the  AG1 TV.
16. Great care must be take when handling the fibres.
17. Using cable ties secure all the fibres  at the end of the swan's neck. Ensure the cable ties are on the metal part not on the grey mesh.
18. 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.
19. Remove top end ring working platform.

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

The following commands that  are to be typed at the ICL command line, are given after the ICL prompt.

Testing AUTOFIB

1. Waking the robot.
   • 14:01:00 > afwake
   • This turns the AF2 power on. At ICL the Autofib mimic will update and all the variables turn green. You should also hear the pneumatic gripper being exercised. If this does not work it is probably either the system is accepting local commands only or the VME needs booting in GHRIL. (See engineering notes for detailed instruction.)
2. Turn on the WYFFOS back-illumination.
   • 14:02:30 > afbackillum on
   • This turns WYFFOS back-illumination. Backillumination sends light from WYFFOS up the fibres to AF2. Also it turns on the TV back-illumination.
3. View a science fibre.
   • 14:03:00 > afviewfibre 15
   • This moves the robot gripper camera to the co-ordinates for this particular science fibre. On the Autofib monitor in the control room should be the illuminated fibre. If you see no fibre check on WYFFOS mimic display that backillum is on.
4. View a guide fibre.
   • 14:05:30 > afviewfibre 32
   • >. As above but this checks that the backillumination is on to the guide fibres. NB the illuminated fibre on the TV monitor looks smaller than a science fibre, this is because a mask is in front of it.
5. Load the small fibre module.
   • 14:06:30 > afloadm
   • This locates and re-affirms the fibre positions. NB This command turns backillumination ON if it is not already on. This normally takes no more than 10 minutes. No fibres are moved with this command. If it fails to complete go to Autofib engineering notes.
6. Turn off the backillumination
   • 14:20:00 > afbackillum off
7. Park the AF2 Robot
   • 14:21:30> afparkr
   • This parks the robot to the edge of the fibre field but the power remains on.
8. Move the off-axis mobile probe into the field.
   • 14:25:00 > afmovp 150000
   • This moves the off-axis probe. NB the robot must be parked <afparkr> to complete this operation.
9. Move the off-axis mobile probe back to the back position.
   • 14:27:00 > afmovp 0
   • This moves the probe to its park position.

10. Turn off all dome lights
11. Turn the Wyffos calibration lamps on.
    • 14:30:00 > wcal 2  on
    • This turns a neon lamp in the calibration unit on
12. Take an 1 sec exposure with AG1 (autoguider)

            You should see the ten fiducial bundles now

13. To test AG2 make sure the mobile probe is in the field
    • 14:30:00 > afwake
14. Take a 1 second exposure with AG2

            The mobile probe should be illuminated now

15. Sleep the robot
    • 14:34:30 >afsleep
    • This safely parks robot out of the field and turns the power off.

This is not a detailed check but proves communications. Moving other things like the grating can disturb the observers set-up.

Note: make sure after you issue a wfilt command you wait until it completes the filter movement and the focus adjustment before giving the next command. Otherwise the focus correction will not be aplied correctly

16. Check WYFFOS filter slide A
    • 14:36:00 > wfilta in
    • 14:38:00 > wfilta out
17. Check WYFFOS filter slide B
    • 14:40:00 > wfiltb in
    • 14:42:00 > wfiltb out
18. Make sure the Nitrogen flush for the CCD window is switched on (especially in winter with humid conditions) Open epics engineering consul and switch LN2 flow on.
19. Switch neon lamp on 
    • 14:43:00 > wcal 2 on
20. Take an exposure with wyffos on taurus 
    • Sys >run whtwfc 10
    • Display in DS9 and analyse with Iraf to see whether there are arclines visible
21. Switch calibration lamps off
    • 14:44:00 > wcal off
22. Take a bias frame with wyffos on taurus
    • Sys >bias whtwfc
    • Display in DS9 and analyse image and check the noise

20. Use the wyffos mimic to display corrector element positions.
    • 14:44:00 > adc_auto disable
    • 14:47:00 > adc 90
    • 14:50:00 > adc -90
    • 14:53:00 > adc auto_enable

Astronomy Checks (day time)

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

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

The instrument change and checks are now complete.  The telescope and instrument are ready for the telescope operator and observer.

Make sure all tickboxes are marked. Put this copy in the daily operations logbook.

Last updated 17 feb 2005 by MVDH