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Äàòà èçìåíåíèÿ: Fri Oct 1 05:47:23 1999
Äàòà èíäåêñèðîâàíèÿ: Sat Apr 9 22:55:27 2016
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Supplement to the 2.5 m Preflight Check

S. Snedden, D. Long

Preparations for Science:

Building closed four hours before sunset: Refer to "Procedure for Opening, Closing and Moving the SDSS 2.5-meter Telescope" by D. Long, W. Boroski and A. Prosapio.
Start exhaust fan: The exhaust fan power buttons are on the east wall of the lower enclosure. Do not start or keep the fans blowing if the humidity goes over 80%, or if it is raining.

Telescope Aliveness Test:

Start TPM logging for the night: Telnet to sdsstpm, then type tpm. A name must be given for the file the TPM logs to. The standard will be "tpm-MJD.dat" (e.g. "tpm-51522.dat" for data taken on modified Julian date 51522). So you should type "start data tpm-MJD.dat" to begin the datalogging session.
Verify MCP is talking and Menu will run: Telnet to sdssmcp, then type "Menu". If the Menu is not talking, try using <control>-x to re-boot it. If that does not work, a hard re-boot can be done by pressing the restart button on the MCP, located at the top of the same rack as the interlock bypass switches in the lower enclosure. If you have to reboot, you will also have to restart the TPM logging.
If not already done, set Az and Alt brakes: In the Menu, look for "Az Brake On" and "Alt Brake On". If they are off, type "l" (for altitude) then "b" (for brake). Next, type "z" (for azimuth) then "b" (for brake).
Check that nothing is around/on the telescope which would interfere with altitude or rotator motion: Check for loose wires, fibers and cables that might catch as the telescope moves. Gaff them down. Look for tools, trouble lights, etc. left on or near the telescope by the day staff . You can also clean the exposed drive surfaces at this time with a lint-free cloth sprayed lightly with WD-40. Now would also be a good time to check the windscreen drive chain tension and Belleview washers. The washers should not have gaps between them. The drivechain should be taut enough that you can't manually move the links.
Make sure nothing is in the path of the rotating racks, or on/around Az drive disk: Check for loose wires, fibers and cables that might catch as the telescope moves. Gaff them down. Look for tools, trouble lights, etc. left on the racks or left in their path. Clean the exposed drive surfaces with your lint-free cloth lightly sprayed with WD-40.
Check air pressure gauges for the main compressed air supply and primary support system: At this time, you should also check the primary support system for condensed water, and the imager camera pressures. The specs for each gauge should be printed on or near the gauge itself. The gauge for the compressed air supply is on the east wall of the lower enclosure. The two grade 5 N2 bottles that pressurize the camera bellows are also located on the east wall of the lower enclosure. The imager camera dry grade 2 N2 pressure gauges (that provide pressure to the LN2 dewar) are on the bottle in the SW rack. The primary mirror support pressure and vacuum gauges and imager pressure and vacuum gauges are also all on the SW rack.

The grade 5 N2 bottles are plumbed in series. The active bottle should be labeled "in use" and the reserve,"full". Should the gauge read below 500 psi, open the full bottle, and close the empty one. When a bottle is empty, make sure you label it as such, and label which bottle is in use. You should then e-mail Norm so the empty can be replaced. Each bottle should last a long time. If we notice that we are having to change bottles frequently, it is evidence of a leak in the system, and should be reported.
The PMSS (primary mirror support system) air should be dry. Check that the dessicant is the right color (blue) in the cannister window on the SW rack and that there is no water visible in the flex hoses.

Be sure a stop button is in, preferably at the telescope: Hopefully this is self-explanatory.
Check telescope balance: At a reasonably low altitude (~15 deg), release the Alt brake in the MCP Menu ("l", if not already talking to the altitude axis, then "c"). Put on a stop and push/pull the telescope in altitude. If the telescope feels topheavy, decrease the counterweight values ("^" in the MCP Menu, followed by the desired voltage for the counterweights). If bottomheavy, increase the values. When balanced, put the brake back on ("b" in the MCP Menu). A more quantitative way to check balance is to look at the output voltages in the MCP Menu as you slew back and forth in altitude. They should be roughly equal and opposite and should not exceed +/- 4000 V.
Start the interlocks display and check that all looks normal: Start a watcher session on sdsshost ("ssh username@sdsshost" enter your password, then type "setup watcher", then "watcher"). Click on MCP, then right-click on "Communications" in the System Details window. Check to see that the display reflects reality.
Check the interlocks bypass panel to be sure you know the state of any bypassed interlocks: The panel is on the NW rack in the lower enclosure. First check to see if the key lock has been set to enable bypassing the interlocks. If so, a red LED indicates an interlock has been bypassed.
Turn on Glenteks: The Glentek amplifiers are in the NE rack in the lower enclosure. Note that the altitude and azimuth amplifiersare labeled. The remaining amplifier is for the rotator. Press the main power button and make sure the toggle switch is set to "remote". Check the status LEDs. Press the reset button if necessary.
Check that servo connections for windscreen are in place: Open the white box on the wall in the NE corner ofthe lower enclosure. The "key" is a flat-bladed screwdriver. There are two Burndy connectors, one for altitude motion of the windscreen, the other for azimuth. They are labeled. Make sure the connectors are in place. One or both might be disconnected if the pendant was used to manually move the telescope.
Turn on windscreen with knife-switch: The switch is under the windscreen control box. Breaker 33 must also be on. Check the breaker box on the E wall.
Check altitude motion via MCP: Release all stop buttons. The Menu status columns will say "S" if a stop button is in somewhere. Type "l" in the MCP Menu if you are not already talking to the altitude controllers. Reset the altitude amplifiers by typing "*" in the Menu. You may hear the amplifiers reset. Release the altitude brake ("h"(hold) followed by "c" (clear) in the MCP Menu). At this point, the two status columns should show asterisks, indicating you are ready to move. Set an altitude destination ("d" in the Menu, followed by the desired altitude in DD:MM:SS). Do not go higher than 20 degrees inside the enclosure (based on the clinometer). In fact, 18 or 19 degrees is as high as you need to go. Check the velocity displayed in the Menu. 150,000 is reasonable for most purposes. If you are inside the enclosure and a nervous type, set it lower. To change the velocity, type "v" in the Menu and enter the desired value. Type "m" (move) and the telescope should begin moving in altitude. Clean the exposed altitude drive surfaces at low and higher altitudes with a non-shedding wipe sprayed lightly with WD-40.
Set the altitude fiducial: The valid fiducial is close to 15 degrees, so start lower, (at 14.5 degrees), and cross the fiducial mark in the increasing altitude direction. Use the "k" key in the Menu to increment the velocity by the amount shown (defaults to 1000 cts/sec). Increment the velocity to about 5000 cts/sec. Go past the fiducial mark by about 20 arcmin, then put the telescope in hold ("h"). Wait for the altitude readout to stabilize, then hit "f". If the altitude display changes by more than a few arcsec, redo the procedure. Set the brake ("b").
Check rotator motion via MCP: Release all stop buttons. The Menu status columns will say "S" if a stop button is in somewhere. Type "r" in the MCP Menu if you are not already talking to the rotator. Reset the rotator amplifier by typing "*" in the Menu. You may hear the amplifier reset. At this point, the two status columns should show asterisks, indicating you are ready to move. Set a rotator destination ("d" in the Menu, followed by the desired angle in DD:MM:SS). Check the velocity displayed in the Menu. 250,000 is reasonable for most purposes. To change the velocity, type "v" in the Menu and enter the desired value. Type "m" (move) and the rotator should begin moving. Clean the exposed rotator drive surfaces as needed (unless you did this during the safety inspection).
Set the rotator fiducial: You need to cross two valid fiducial marks to set the rotator. Go to a destination angle of -4 degrees and move to a little past 1 degree, incrementing the speed to 5000 counts.sec with the "k" key. Wait for the readout to stabilize, then hit "f". If the rotator angle display changes by more than a few arcsec, redo the procedure.
Check azimuth motion via MCP: Before you move in azimuth, make sure a stop button is in and take your lint-free wipe sprayed lightly with WD-40 and clean the exposed parts of the azimuth drive surface in the lower enclosure (unless you did this during the safety inspection).This part can be done with the telescope still inside the enclosure. The rest of the procedure must be done with the telescope in the open, until the new enclosure is in place. Next, release all stop buttons. The Menu status columns will say "S" if a stop button is in somewhere. Type "z" in the MCP Menu if you are not already talking to the azimuth controllers. Reset the azimuth amplifiers by typing "*" in the Menu. You may hear the amplifiers reset. Release the azimuth brake ("h"(hold) followed by "c" (clear) in the MCP Menu). At this point, the two status columns should show asterisks, indicating you are ready to move. Set an azimuth destination ("d" in the Menu, followed by the desired azimuth in DD:MM:SS). Set the velocity (150,000 counts/sec is good) by typing "v" and entering the velocity. Type "m" (move) and the telescope should begin moving in azimuth. It is a good idea to combine your test slews with finishing the azimuth drive surface cleaning. Slew to a destination of 105 degrees, then put the brake on ("b"), hit a stop, and go clean the freshly exposed azimuth drive surface. Do the same after clearing the stop and brake ("c") and slewing to a destination of 135 degrees.
Set the azimuth fiducial: The valid fiducial is close to 121 degrees, so start lower, (at 120 degrees), and cross the fiducial mark in the increasing azimuth direction. Use the "k" key in the Menu to increment the velocity by the amount shown (defaults to 1000 cts/sec). Increment the velocity to about 5000 cts/sec. Go past the fiducial mark by about 20 arcmin, then put the telescope in hold ("h"). Wait for the azimuth readout to stabilize, then hit "f". If the azimuth display changes by more than a few arcsec, redo the procedure. Set the brake ("b").
If the first instrument of the night is not already on, mount it: Since each instrument's mounting procedure is different, you should refer to it's checklist.
Make sure TELRUN is running: Telnet to tcc25m (user tcc, password _______________) and type "telrun". Next, type "axis init" and check the values that the tcc gives you.
Make sure the proper instrument is set in TELRUN: type "show inst" to see what instrument block is loaded. To set a particular instrument, type "set inst=instrument", where instrument can be engcam, imager, spectro.
Make a test slew using the TCC: Currently, this should be done in the open. Slew using the TCC "track" command. The format is "track coord1,coord2 coordtype" e.g. "track azimuth,altitude mount" (where you put in the desired azimuth and altitude, of course), or "track RA,Dec fk5". You can specify rotator motion by adding "/rotang=angle /rottype=rot_type". rot_type can be "none", "object", "horizon", "physical", or "mount". See the TCC commands list for more detail on these options. After you have tested slewing with the TCC, return to stow position (azimuth=121 degrees).
Hit the north windscreen stop button: This is the stop button on the north side of the telescope (when in stow position) and is the easiest button to get to from the laptop.
Verify primary controller talks to the TCC: From the TCC, type "prim stat". The current and target positions should be the same.
Verify primary is in proper position (galils and migs): From the TPM session you started earlier, type "migDebug". MIGs 1, 2, 3, 5 and 6 belong to the primary mirror. Check the displayed values against the expected values (check the night logs to get these values).
Verify secondary controller talks to the TCC: From the TCC, type"sec stat". The current and target positions should be the same.
Verify secondary is in proper position (galils and migs): The values displayed from"migDebug" for MIGs 4, 7 and 8 belong to the secondary. Check the displayed values against the expected values.

Last update: 9/30/99