LBT Q4 2007 Engineering LBT Q4 2007 Engineering ReviewReview

HBSCHBSC

Hydrostatic Bearing SystemHydrostatic Bearing System

21-Dec-200721-Dec-2007 LBT Q4 2007 Engineering RevieLBT Q4 2007 Engineering Revieww

Highlights (Q4/2007)Highlights (Q4/2007)

Capillary adaptors installed on Az and Capillary adaptors installed on Az and EL in L-R corner.EL in L-R corner.

Limited measurements made with Limited measurements made with proximity sensor proximity sensor

We can now read the status of the stow We can now read the status of the stow pins and stow pin proximity switches pins and stow pin proximity switches when in local or remote mode on the when in local or remote mode on the SCP.SCP.

Can locally save changes to flash cardCan locally save changes to flash card

21-Dec-200721-Dec-2007 LBT Q4 2007 Engineering RevieLBT Q4 2007 Engineering Revieww

21-Dec-200721-Dec-2007 LBT Q4 2007 Engineering RevieLBT Q4 2007 Engineering Revieww

21-Dec-200721-Dec-2007 LBT Q4 2007 Engineering RevieLBT Q4 2007 Engineering Revieww

21-Dec-200721-Dec-2007 LBT Q4 2007 Engineering RevieLBT Q4 2007 Engineering Revieww

21-Dec-200721-Dec-2007 LBT Q4 2007 Engineering RevieLBT Q4 2007 Engineering Revieww

21-Dec-200721-Dec-2007 LBT Q4 2007 Engineering RevieLBT Q4 2007 Engineering Revieww

Open IssuesOpen Issues TechnicalTechnical

PLC Control law unknown, undocumented.PLC Control law unknown, undocumented. Firewall not penetrable for WinCCFirewall not penetrable for WinCC Capillaries adaptors not installed in El and Az pads 1, 2 & Capillaries adaptors not installed in El and Az pads 1, 2 &

33 Capillaries not installed in any El and Az padsCapillaries not installed in any El and Az pads Capillaries uncharacterized/adjustedCapillaries uncharacterized/adjusted

ScheduleSchedule NoneNone

FinancialFinancial NoneNone

ResourceResource Mountain support pacing operationMountain support pacing operation Network and Firewall communications issues unresolvedNetwork and Firewall communications issues unresolved

21-Dec-200721-Dec-2007 LBT Q4 2007 Engineering RevieLBT Q4 2007 Engineering Revieww

Progress (Q4/2007)Progress (Q4/2007)

Capillary adaptors installed on Az and Capillary adaptors installed on Az and EL in L-R corner.EL in L-R corner.

Limited measurements made with Limited measurements made with proximity sensor proximity sensor

We can now read the status of the stow We can now read the status of the stow pins and stow pin proximity switches pins and stow pin proximity switches when in local or remote mode on the when in local or remote mode on the SCP.SCP.

Can locally save changes to flash cardCan locally save changes to flash card

21-Dec-200721-Dec-2007 LBT Q4 2007 Engineering RevieLBT Q4 2007 Engineering Revieww

Planning (Q1/2008)Planning (Q1/2008)

Move the El and Az capillaries to the pads and Move the El and Az capillaries to the pads and resize resize

Systematic measurement of lift, tuning system to Systematic measurement of lift, tuning system to maximize stiffnessmaximize stiffness

Replace hoses with hard pipe on level 5Replace hoses with hard pipe on level 5 Document existing S7 code with a process Document existing S7 code with a process

flowchart (VoltsDC)flowchart (VoltsDC) Describe new control laws correcting:Describe new control laws correcting:

pressure OKpressure OK system shutdown when pocket pressures failsystem 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.