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operation:technical
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operation:technical [2017/12/05 00:17] Warren Hankey |
operation:technical [2018/01/28 22:02] (current) Warren Hankey |
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| http://webcamyg.phys.utas.edu.au | http://webcamyg.phys.utas.edu.au | ||
| + | ==== 26 m Telescope ==== | ||
| + | ==Receiver Position== | ||
| + | In Otter interface [r] resets box in focus cabin. If receiver position display is "zero" indicates error (all bits zero) indicative of reset required. | ||
| + | Above fault also means auto receiver position not working. | ||
| + | ===Cryo System=== | ||
| + | |||
| + | Action plan after warmed and severe pressure drop. Compressor has cut out as pressure went below 150 psi | ||
| + | |||
| + | - commence vaccuming S/X using turbo pump | ||
| + | |||
| + | - turn off the SX cryodyne in the diesel room so that the blue motor stops | ||
| + | |||
| + | - turn off the L-band cryodyne by pulling out the lead to the L-band | ||
| + | cold head in the focus cabin | ||
| + | |||
| + | - use hastings vac gauge and Edwards oil filled vac pump to pump L-band | ||
| + | dewar while it warms(dear valve open whilst pumping). | ||
| + | |||
| + | - top up the helium supply to 300 psi if the compressor is running OK. | ||
| + | If has shut down, increase the pressure slightly then restart the | ||
| + | compressor and increase the pressure to 300 psi supply. | ||
| + | |||
| + | - locate the leak. Leak detector goes yellow for heavy molecules, red for light gas. Keep skin away from tip, and don't breathe near tip. | ||
| + | |||
| + | - power down the compressor | ||
| + | |||
| + | - replace leaking hose | ||
| + | |||
| + | - power up the compressor, must have > 150 psi to start | ||
| + | |||
| + | -top helium up to 300 psi once compressor running | ||
| + | |||
| + | - commence s/x cooling by turning on cryo S/X power in diesel room | ||
| + | |||
| + | - start L-band cryodyne | ||
| + | |||
| + | - 3 hours of cooling with vac pump on L-band is required | ||
| + | |||
| + | - close l-band dewar valve | ||
| + | |||
| + | - remove Edwards pump. | ||
| + | |||
| + | -close SX dewar valve and turn off turbo | ||
/home/www/auscope/opswiki/data/attic/operation/technical.1512433045.txt.gz · Last modified: 2017/12/05 00:17 by Warren Hankey
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