If Cold Cycle Refrigeration CCR) system is running, i.e. NIRSPEC is COLD, then follow ALL steps in the procedure.

If NIRSPEC is WARM and the CCRs are off, then you may omit steps in blue lettering.

Be expeditious while the CCRs are off: Turning off the NIRSPEC CCRs provides approximately 10 min before the dewar vacuum pressure reaches an unacceptably high value. At that point, either the CCRs need to be powered on or a vacuum pump needs to be pumping on the dewar. Otherwise NIRSPEC will lose vacuum completely and will need to be warmed to ambient, pumped, and then cooled back to operating temperature, a 15 day process.

TOOLS

• Stopwatch
• CCR wrench kit from the NIRSPEC shelf in the instrument lab.
• 1 20 ft. extension cord.
• 1 power strip
• 1 TOSS 50 vacuum pumping station w/:
• 1 KF25 - KF40 adaptor
• 2 lengths of KF40 vacuum tubing
• 2 KF40 O-rings and clamps
• Tools to remove the AO threshold.
• 1 Wire cutter.

PERSONNEL

• 1 person to operate telescope controls, switch cables in the computer room, start/stop CCR compressors.
• 2 people at Nas Deck level to move the NIRSPEC handler and vacuum pump and disconnect/reconnect cables.
• 1 person at Nas Deck level with stopwatch to keep track of time and monitor vacuum pressures and read procedures.

TIME

• Total Procedure should take about 2:20.

COMPUTER ROOM

• Log on to Sun workstation "kua" as user "nspeceng".
• From the workspace pulldown menu, choose  NIRSPEC Control Menu->Stop NIRSPEC Server.

TELESCOPE

• Move telescope in elevation above 45 degrees to clear Nas Deck elevation limit.
• Move telescope in azimuth to 10.8 degrees to roughly align Nas Deck handler position RT4 with AO enclosure door.

AO ENCLOSURE

• Remove AO door clip and open AO door from the outside.
• Remove AO door threshold. Stow threshold on Nas Deck. Picture
• NOTE: the following steps apply only if the Dual Star Module (DSM) is not present in the AO enclosure. If the DSM is present, move it out and onto the "NIRSPEC storage rails" on the Right Nasmyth platform.
• Remove rack and rail floor panels [labels to be determined by drew] in order [also TBD by drew] inside AO enclosure. Stow panels on Nas Deck. Picture
• Install instrument insulated floor panels between rack and rail channels. Picture

CAUTION: Ensure panels are down flat on the flashing otherwise damage to the panels and/or instrument cart could occur.
• Remove instrument interface access hole floor panel. Picture
• Pull and fully extend the stainless steel braided CCR supply and return lines [AO-CCR] out through the floor opening.
• Locate and install the CCR Power patch cable, AOCCRAC,  to J??? on the AO/NIRSPEC Instrument connect Panel (acronym? label?) and extend the cable out through the floor opening.
• Replace the grating with CCR lines and CCR power patch cable passing through the slot between the grating and rail channel. Picture
• Ensure the rack and rail, kinematic mount and fairlead areas are all clear of obstacles.
• Close AO door and clip shut.

TELESCOPE

• If NIRSPEC is in the operational position, move telescope in azimuth to 193.7 degrees to line up Nas Deck handler position RT4 with the Right Nas Platform NIRSPEC focus.

RIGHT NASMYTH PLATFORM

• Verify that the rack and rails are clear of objects and debris between NIRSPEC and the end of RT4
• TEMPORARY: IN EFFECT 1 May 2001 Verify that the air supply hose from the telescope is disconnected from the regulator. The regulator is on or near the NIRSPEC glycol interface panel, and has small-gauge plastic hose coming out of it and going into the calibration unit. This hose carries the airflow for the dewar window purge.
• Open front right insulation panel on NIRSPEC and turn off main power breaker on Pulizzi unit. Picture
• Remove grating cover near boom and close instrument cooling supply ball valve (valve handle points away from the cable boom), then close return ball valve (valve handle points towards the cable boom). Picture
• Connect transfer cart power cord from RT4 to NIRSPEC cart. Picture
• Ensure that the cable boom tether is attached to the tension switch and the tension switch is connected.
• Unlock the cable boom deadbolt, located at the base of the boom.
• Jack NIRSPEC up off the kinematic mounts by pressing and holding the "up" button on the side of the handler until the jack screws stop automatically.
• Release the cable ties to create slack in the cables.
• Remove platform and deck safety chains, then drive NIRSPEC on its cart to the RT4 park position on the Nas Deck. Carefully shepherd the boom cables and boom rotation.
• Re-install safety chains on Nasmyth platform and deck.
• Cover Right Nas Platform kinematic mount cover plates with the steel plates stored near the motor at the rear of the NIRSPEC handler.
• NOTE: DO NOT REMOVE CCR HOSES OR CCR POWER CABLE YET. Disconnect only the following boom cables:
• Disconnect P2 & P3 (transputer fiber optics) from Nirspec Connect Panel [NCP], J2 & J1.
• Disconnect P4 & P5 (PXL Camera fiber optics) from NCP, J4 & J3.
• Disconnect NIRSPEC AC clean and commercial power cable.
• Disconnect the Glycol supply and return lines from the NIRSPEC Cooling Panel [NIRSPEC-Cool].
• Remove the CCR line protection hoops. Picture
• Disconnect the boom tension switch tether rope and cable. Picture
• Mount and connect TOSS 50 vacuum pump and vacuum gauge to NIRSPEC, using the platform on the handler frame below NIRSPEC's vacuum valve. Provide 40 foot long AC power extension cord to pump from Nas Deck connector panel commercial AC outlet. Start pumping the line only, leaving vacuum valve closed. Ensure vacuum line is pumped down below 1x10-4 Torr before proceeding.
• Unplug the NIRSPEC vacuum gauge from NIRSPEC commercial power and plug it into the extension cord or power strip on the pump. Verify that the vacuum is being read. Monitor the vacuum throughout the transfer, and record vacuum readings every 1-2 minutes while CCRs are off.
• Obtain a stopwatch.

COMPUTER ROOM

• Verify that the telescope does not have any handler interlock faults by switching the telescope drive power on at the MCP. If the power comes on, there are no Azimuth interlock faults present.
• Switch the telescope drive power off.

MECHANICAL ROOM

WARNING:
Be expeditious: You have approx. 10 minutes on the stopwatch to get the NIRSPEC CCR lines hooked up in the AO enclosure and the compressor started. Designate one person responsible for calling out stopwatch readings and recording the dewar vacuum every minute. If the vacuum inside the NIRSPEC dewar exceeds 1x10-3 Torr, check that the vacuum pump is on and that the vacuum line is pumped down, then open the vacuum valve on NIRSPEC and begin pumping the dewar.
 
• Shut off the NIRSPEC CCR compressor.
• Immediately start the stopwatch.

 
 

RIGHT NASMYTH DECK (in parallel with following tasks in the Computer Room)

• Disconnect supply and return CCR lines on boom from the NIRSPEC instrument panel using the tools in the CCR tool kit obtained from the NIRSPEC shelf in the instrument lab.
• Disconnect CCR power cable PS1 on boom from NCP, JS1.
• Stow boom cables then rotate NIRSPEC boom clockwise to stow position and slide the dead bolt in place to lock. Picture

COMPUTER ROOM (in parallel with the above tasks on the Right Nasmyth Deck)

• Disconnect CCR Power Cable PS1 from NIRSPEC Instrument Interconnect Panel [IIP-NP Right Nasmyth Platform] JS1.
• Connect CCR Power Cable PS1 to NIRSPEC Instrument Interconnect Panel [IIP-NP Left Nasmyth Platform] JS1.

TELESCOPE

WARNING: There is a telescope interlock on the cable boom. If the boom is not properly stowed, the telescope will not move at its full speed.
• Rotate telescope in azimuth to 10.8 degrees (which is a move to the "left" in telescope sense) and roughly align RT4 rails to AO door.
• Open AO door and fine align RT4 rails to AO rails.

AO ENCLOSURE

• Drive NIRSPEC handler into the AO enclosure far enough for the steel-braided CCR hoses to reach their connection points on the NIRSPEC interconnect panel.
• Connect the CCR supply and return lines to the NIRSPEC connect panel [NCP]. You will need the CCR tool kit located in the NIRSPEC shelf in the instrument lab.
• Connect CCR Power Cable AOCCRAC to JS1 on the NIRSPEC connect panel [NCP].
• Check vacuum reading on NIRSPEC and note whether pressure is less than 1x10-3 Torr. If not, then verify vacuum pump is on and vacuum line is pumped down below 1x10-4 Torr, then open vacuum valve on NIRSPEC and begin pumping dewar until 1.0e-3 Torr.

MECHANICAL ROOM

• Turn on the NIRSPEC CCR compressor. Verify the gauge pressure on the compressor is 128 PSI.
• Stop stopwatch and note the time and dewar vacuum for entry in the SIAS.

AO ENCLOSURE

• Note that once the CCR compressor is turned on, the CCR pressure gauges on the instrument should read 315 to 325 PSI on the supply line and 125 to 140 PSI on the return line. Oscillation in the pressure is normal as long as they fall within the range specified.
• NOTE ALSO that the CCR cold heads should start making their familiar "cricket on steroids" sounds immediately upon restart of the CCR compressors. If they do not, then the CCR cold head power has not been properly reconnected. Check that the connections at each end have been properly made:
  1. NIRSPEC: Check CCR Power Cable AOCCRAC to JS1 on the NIRSPEC connect panel [NCP].
  2. Computer Room: Check Power Cable PS1 to NIRSPEC Instrument Interconnect Panel [IIP-NP Left Nasmyth Platform.
• Monitor the NIRSPEC dewar vacuum. When it drops below 1x10-3 TORR, close the dewar vacuum valve if necessary, and disconnect the vacuum pump. Put a blank off on the NIRSPEC inlet valve.
• Unplug the vacuum gauge from the extension cord/power strip and plug it into s NIRSPEC commercial AC power outlet.
• Drive NIRSPEC handler until it stops automatically over the Kinematic mounting points.
• WARNING: Take care that the underside of the NIRSPEC handler does not catch on any of the floor insulation panels.
• DOUBLE WARNING: It has happened at least once that the position switch fails to stop the NIRSPEC handler directly over the kinematic mounting points, allowing it to go too far forward. DANGER, WILL ROBINSON, DANGER! Have someone watch the front of the NIRSPEC calibration unit as the handler advances. The handler should stop with the calibration unit 2-3 millimeters before any contact with the AO bench shroud frame. IF THE CALIBRATION UNIT MAKES ANY CONTACT WITH ANY PART OF THE AO BENCH, STOP IMMEDIATELY. DO NOT JACK NIRSPEC DOWN WITHOUT FIRST BACKING UP AT LEAST 1 FOOT AND TRYING THE FORWARD MOVE AGAIN!
• Jack NIRSPEC down on to the kinematic mounts by pressing and holding the "down" button on the side of the handler. Monitor the lift pads on the rear of the module handler. They should lift slightly off of the handler frame, then stop automatically. If they fail to stop, release the "down" button. If the screws drive too far it could damage the lift mechanism. Additionally, monitor the front screw as it drives down into the kinematic mount. Ensure that it is seating properly in the hole. Picture
• Install CCR protection hoops.
• Remove instrument interface access hole floor panel. Picture
• Connect NIRSPEC AC Power cable, AOAC to jack on NIRSPEC power/glycol interconnect panel.
• Locate and connect the instrument cooling supply and return lines to the NIRSPEC glycol panel.
• Open the instrument cooling supply valve, located under the floor opening on the telescope side of the hole, then open the instrument cooling return valve show. Picture
• Connect Fiber patch cables AOFO1 to NICP-J2, and AOFO2 to NICP-J1.
• Replace the flashing that covers the access hole.
• Replace the instrument interface access hole floor panel. NOTE: Ensure all hoses and cables pass through the gap between the floor panel and the left rail channel.
• Set the toggle switch on the TOP of the NIRSPEC Calibration Unit to its Full-Power/AO postion. This switch controls the power to the internal flat field lamp.
• Open right front insulation panel on NIRSPEC and turn on main power breaker on Pulizzi unit. Verify that all 8 green lights in the horizontal row come on sequentially.Picture
• Disconnect the handler power from the connector at the RT4 stow position on the Nas Deck and retract the cable into the takeup reel on the handler cart.
• Install AO door threshold and shut and secure AO door. NOTE: Do not install the floor panel between NIRSPEC and the door as it will interfere with the handler power cord spool.
• Pull back the black cloth curtain between NIRSPEC and the AO bench. Be sure that the curtain is completely pulled towards the electronics vault (Left side of the AO bench as viewed from the back of NIRSPEC), and that it is completely out from in front of NIRSPEC. Otherwise, it will obscure all or part of the beam entering NIRSPEC.

CONTROL/COMPUTER ROOM

• Disconnect J14 & J15 (transputer optical fibers) from the NIRSPEC Instrument Interconnect Panel [IIP-NP], J14 &J15.
• On the NIRSPEC Instrument Interconnect Panel [IIP-NP], connect the fiber optic lines for the NIRSPEC transputer as follows: Connect Fiber J14 to IIP-NP J2; and connect Fiber J15 to IIP-NP J1.
• Verify that the "link active" light is lit on the SCSI/Fiber Extender "Black Box" labelled "NIRSPEC TRANSPUTER" (located adjacent to the NIRSPEC host computer waimea). If the "link active" light is dark, cycle power to the Black Box. If the "link active" light remains dark, check that the fibers are correctly connected.
• Log on to Sun workstation "kua" as user "nspeceng".
• From the workspace pulldown menu, choose NIRSPEC Control Menu->Start NIRSPEC Server (daytime).
• From the workspace pulldown menu, choose NIRSPEC Control Menu->Check Server Processes. If the NIRSPEC server is running, 3 processes should appear in an xterm.
• Type any key to dismiss the process window xterm.
• From the workspace pulldown menu, choose Login Windows->xgterm 'waimea' (NIRSPEC) to get a terminal window logged in as user "nirspec" on the NIRSPEC host computer "waimea."
• In this terminal window, issue the following commands, in order (each one is executed when you press Enter):
• setenv NIRSPEC_AO (to tell the software NIRSPEC is behind AO)
• echo $NIRSPEC_AO (to check that the previous command worked; should return nothing, just a prompt back; if it says "undefined variable", stop and call an Instrument Scientist for help).
• m fil1init=1 (...and wait about 30 sec, then)
• s fil1stat (...and repeat every 30 sec or so until status returns "OK")
• m fil1step=27100 (...and wait about 30 sec, then)
• s fil1stat (...and repeat every 30 sec or so until status returns "OK")
• z_init_filters
• exit
These commands will (1) initialize Filter Wheel No. 1 which contains the AO pupil stop; (2) report the status of Filter Wheel No. 1; (3) move Filter Wheel No. 1 to the last (as of Feb 2001, it changed from 27085 when new reflective reimaging optics were installed, RDC) measured position for aligning the AO pupil stop with the AO pupil; (4) report the status of Filter Wheel No. 1; (5) initialize Filter Wheel No. 2, and set the software flags to identify that Filter Wheel No. 1 is in the AO-pupil-stop position; and (6) quit the window.
• From the workspace pulldown menu, choose exit...

For Instrument Scientist: CONTROL ROOM or ELSEWHERE WITH NETWORK ACCESS

• Log in as user "nirspec" on the NIRSPEC host computer waimea, and edit the .cshrc file to UNCOMMENT the line:

  #setenv NIRSPEC_AO

• Log in as user "nirspec" on the Remote Ops 2 Observer's machine hanauma, and edit the .cshrc file to UNCOMMENT the line:

  #setenv NIRSPEC_AO

last modified: D. Sprayberry, 2 May 2001