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LBT Q4 2007 Engineering Review

LBT Q4 2007 Engineering Review. HBSC Hydrostatic Bearing System. Highlights (Q4/2007). Capillary adaptors installed on Az and EL in L-R corner. Limited measurements made with proximity sensor

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LBT Q4 2007 Engineering Review

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  1. LBT Q4 2007 Engineering Review HBSC Hydrostatic Bearing System

  2. Highlights (Q4/2007) • Capillary adaptors installed on Az and EL in L-R corner. • Limited measurements made with proximity sensor • We can now read the status of the stow pins and stow pin proximity switches when in local or remote mode on the SCP. • Can locally save changes to flash card LBT Q4 2007 Engineering Review

  3. LBT Q4 2007 Engineering Review

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  8. Open Issues • Technical • PLC Control law unknown, undocumented. • Firewall not penetrable for WinCC • Capillaries adaptors not installed in El and Az pads 1, 2 & 3 • Capillaries not installed in any El and Az pads • Capillaries uncharacterized/adjusted • Schedule • None • Financial • None • Resource • Mountain support pacing operation • Network and Firewall communications issues unresolved LBT Q4 2007 Engineering Review

  9. Progress (Q4/2007) • Capillary adaptors installed on Az and EL in L-R corner. • Limited measurements made with proximity sensor • We can now read the status of the stow pins and stow pin proximity switches when in local or remote mode on the SCP. • Can locally save changes to flash card LBT Q4 2007 Engineering Review

  10. Planning (Q1/2008) • Move the El and Az capillaries to the pads and resize • Systematic measurement of lift, tuning system to maximize stiffness • Replace hoses with hard pipe on level 5 • Document existing S7 code with a process flowchart (VoltsDC) • Describe new control laws correcting: • pressure OK • system shutdown when pocket pressures fail • control around pressure, not lookup table (LBT) • Rewrite PLC code using new control laws (VoltsDC) • Reduce system pressure from 120 to 95 bar. LBT Q4 2007 Engineering Review

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