LBT Q Engineering Review HBSC Hydrostatic Bearing System

21-Dec-2007LBT Q Engineering Review Highlights (Q4/2007) Capillary adaptors installed on Az and EL in L-R corner. Capillary adaptors installed on Az and EL in L-R corner. Limited measurements made with proximity sensor 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. 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 Can locally save changes to flash card

21-Dec-2007LBT Q Engineering Review

21-Dec-2007LBT Q Engineering Review

21-Dec-2007LBT Q Engineering Review

21-Dec-2007LBT Q Engineering Review

21-Dec-2007LBT Q Engineering Review

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

21-Dec-2007LBT Q Engineering Review Progress (Q4/2007) Capillary adaptors installed on Az and EL in L-R corner. Capillary adaptors installed on Az and EL in L-R corner. Limited measurements made with proximity sensor 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. 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 Can locally save changes to flash card

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