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How to power back telescope

Procedure for powering up the Magellan Telescopes after a lightning storm


All computers and telescope systems should be powered back on in sequence in order to recover all functions without creating further problems.

This procedure is, in our opinion, the way to do it properly. It can be carried out by two or three people, but it should be coordinated by the Magellan Electronics engineer.


1.     Restore power to the equipment in the Auxiliary Building, paying special attention to the CISCO 6500 Router and the DNS0 (name server). Once the Router starts, Ethernet should be available for the whole Magellan site.

2.     All telescope control computers can be powered on without preventions, but having in mind that most of their related devices might not be able to communicate since might be still not powered.

If the whole telescope was powered off from panel B16/B26 in the equipment room, it is better to switch off all the breakers in the ‘UPS power distribution panel’ on the telescope floor before starting.


After that, UPS power can be restored at the Telescope UPS and at panel B16/B26. This should power on all the devices in the control room, although some of their power cords would need to be plugged back on their respective outlets. The equipment in the control room would also get powered on.

In parallel with or after the above, restore power to the equipment in the air compressors’ room and start at least one compressor. Also, turn on the Telescope Chillers and the HVAC Chillers.


3.     In the control room, restart all the computers. The Raritan KVM switches should restart automatically.


4.     The direct power needs to be restored to the telescope systems by turning on the TESS (Telescope Emergency Stop System) panel from breaker #18 on Panel B13 (Baade) and from breaker #25 on Panel B23 (Clay), located in the respective control room.


5.     Before restoring power to the equipment in the telescopes, make sure that the CCD and guider power supplies have their output switches to their OFF position, to avoid them from going into foldback (if they are powered up with their loads connected); don’t forget IMACS long camera, short camera and guider cameras’ power supplies. Also, unplug the cell computer at each telescope to keep it form being powered up at the same time the rest of the cell is.


6.     Then, in the UPS power distribution panel at the telescope floor, restore power to telescope systems switching on the breakers as needed. Use the document ‘Magellan UPS power distribution - Which breaker feeds what’ as a guide.

As the systems start, verify that all the communication links get restored by looking at the screens in the control room.

Make sure that the Vane End PC, the M3 PC or Controller, and specially the OSS PC start properly. In the OSS chassis over the mirror covers, the 4-position 24Vdc thermal switch might need to be switched back on to restore power to the M3 turret and some OSS equipment.

Restore power to all the guiders and CCD saddlebags from their power supplies on the Nasmyth platforms or in the West elevation disk.


7.     After the primary mirror cell has been powered and Alpaca/Vicuña have started, power on the cell computer (Mag1cell / Mag2cell). Wait for it to boot and then check its status from Alpaca/Vicuña opening the ‘MagEng’ task.

It is a good practice to carry out a general bump test on the primary cell after a cell power cycle (don’t forget the air compressors). If it passes ok, raise the primary mirror.

It is also convenient to check Ethernet and internet service, making sure that the CISCO Routers in the Auxiliary Building and in the Equipment rooms, and the name servers are working properly.


8.     With the mirror up (and the HPU running), index the telescope Main Drive.


9.     Check all rest of the telescope systems, specially the guiders and guide cameras.


10.   Check all the instruments on the telescopes and in the Auxiliary Building.


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