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Section 5 : Fitting the Secondary Mirror

Fitting the Secondary Mirror

1.       Crane up to the dome the secondary mirror.
2.       Bolt the secondary mirror on to the telescope and tighten the top two bolts that are used to locate it. DO NOT TOUCH THE BOTTOM TWO LOCATION BOLTS.
3.       Remove the lifting frame.
4.       Connect the power supply cable and the three LVDT cables.
5.       Remove the mirror cover.
6.       Check that the cabling is secure and pay particular attention that there is nothing behind the balance weights of the secondary, as these move in and out during use.
7.       Fit the baffle, taking care not to catch the mirror or trap any cables.
8.       Check the area to ensure that there are no loose components.

1.       Release telescope ties when you are sure telescope is near to balance and slightly bottom end heavy.
2.       Turn on the power to the flip ring. The switch is on the ring.
3.       Put the telescope back to zenith.
4.       Flip the ring.
5.       Bring the telescope back to access park.
6.       Turn off the power to the flip ring.
7.       Fit the cover to the front of the baffle.
8.       Put the telescope back to zenith.

1.       Paper calculation on moments removed and added.
2.       Check top to bottom
3.       Check across cube
4.       Check top to bottom

1.       Turn the power on to the prime focus in the control room.
2.       Using the TCS, move the focus through its full range using <focus>. The range is 34.5 to115.
3.       Using the <page> command in the TCS, check that the three LVDT's work correctly. These should have a reading of between -100 and +100.

1.       Check that all AF2 cabling and equipment is accounted for in the AF2 cabinet.
2.       Tidy up!

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