European Southern Observatory New Technology Telescope

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Recovery Procedures

The points 1-6 are listed with increasing severity of the problem, so always start with 1 and only if this fails go to the next point.

PLEASE NOTE DOWN ALL THE STEPS AND THEIR RESULTS, in order to backtrack the bug later.

1. Check if the wheel turns.

• take short DIT (~1s) and watch during init if the image changes. This would indicate that the wheel is turning.
• Launch 'isiStatus &' and click on the motors icon.Then click on the grism function. The three letters before the position field indicate: L S O for loaded/stand-by/on-line, D E for disabled/enabled and - M for the Move signal. Check that normally it should read O E - and if the function is moved it changes to O E M
• Alternatively one can launch 'inducerStarter &' in a window and configure it for 'lsofi' and '/acro0'
• Watch the move signal on bit 39. This bit should turn red when the function moves
• If the function does not move go to step 2, otherwise try to init again with the back-up sensors (see under step 2.)

• click on the SOFI icon to activate the 'ismsStart' panel. Click 'Configure'. Click 'Reboot ICS-LCU'. Click START. Wait for the boot to complete and watch the logs by clicking on ICS above the log field.
• Initialize the functions. If the grism does not init click on the function title bar GRISM in the OS or ICS control panel. This brings up the motor control panel. Here you have direct access to the functions. Try to init from this panel by clicking 'HW INIT'
• You can also start 'isiControl' manually. This panel gives acces to more commands than the OS.
• If this also fails try to init with the back-up sensors. Click 'Back-up Init' on the motor control panel and repeat the 'HW INIT'. You can check bit 19 on /acro1 with the 'inducerStarter' to make sure that the back-up system is switched on.
• If the function still doesn't init, go to step 3.

• Switch power Off  and On again of 'lsofi' in SOFI cabinet #1. You have to get access to the power switch through the back door of the cabinet. The upper orange panel has to be unscrewed and flipped down to get access.
• Repeat the steps described under 2.
• if the function still doesn't init, go to step 4.

• Try to move the wheel:
• from the ICS Motor Control Panel by entering the new encoder value. Most probably the function will not move, as all the above steps already resulted in failure.
• or from the ICS SW Motor Handset. One can call this from the 'Tools' menu in the ICS Control Panel. ('isiControl') but not from the OS.
• If the function does not move go to step 5.

• Bring the ICS into state 'LOADED' by clicking 'OFF' in the ICS 'Commands menu.
• With the LCU Handset in SOFI cabinet #1 try to move the wheel.
• If it does not move, swapp the grism cables on the SOFI cryostat i.e. with filter 2 or filter 1 and try to move again. Position the wheel in the open position and swap the cables back.
• Disable the grism function in the ICS and edit the enable entry in the ICS configuration file, in order to prevent the grism wheel from being moved again. The file can be opened from the ICS  Control Panel under the 'Tools' menu 'Configuration Tool'. Open 'isiInstrumentSOFI.cfg' and set the variable 'INS.F5.ENABLED' to "F".
• Restart the SOFI session withou the grism wheel. The grism function on the OS should be grayed-out when disabled.
• If this also fails, the instrument cannot be used for observation. Please contact in this case either Ueli Weilenmann, Nicolas Haddad or Jacques Roucher from LIN.

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