LBT Q2 2007 Engineering LBT Q2 2007 Engineering ReviewReview

HBSCHBSCHydrostatic Bearing SystemHydrostatic Bearing System

10-Jul-200710-Jul-2007 LBT Q2 2007 Engineering RevieLBT Q2 2007 Engineering Revieww

Highlights (Q2/2007)Highlights (Q2/2007) PLC now remotely controllable from PLC now remotely controllable from

MCSPUMCSPUStart/Stop/Stow pins in–out/Alarm Start/Stop/Stow pins in–out/Alarm Reset/Remote Mode EnableReset/Remote Mode Enable

WinCC (engineering diagnostic) running WinCC (engineering diagnostic) running on dedicated workstation in Control on dedicated workstation in Control RoomRoom

22ndnd Modified Lateral pad installed last Modified Lateral pad installed last weekweek

10-Jul-200710-Jul-2007 LBT Q2 2007 Engineering RevieLBT Q2 2007 Engineering Revieww

10-Jul-200710-Jul-2007 LBT Q2 2007 Engineering RevieLBT Q2 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

ScheduleSchedule NoneNone

FinancialFinancial NoneNone

ResourceResource Mountain support pacing operationMountain support pacing operation Luciano out of loop.Luciano out of loop. Network and Firewall communications issues unresolvedNetwork and Firewall communications issues unresolved

10-Jul-200710-Jul-2007 LBT Q2 2007 Engineering RevieLBT Q2 2007 Engineering Revieww

Progress (Q2/2007)Progress (Q2/2007) Stow Pin remote control now possibleStow Pin remote control now possible WinCC (engineering diagnostic) WinCC (engineering diagnostic)

runningrunning Completed removal and replacement Completed removal and replacement

of 1 more modified lateral padof 1 more modified lateral pad Hardware and capillaries on hand for Hardware and capillaries on hand for

remaining installationremaining installation

10-Jul-200710-Jul-2007 LBT Q2 2007 Engineering RevieLBT Q2 2007 Engineering Revieww

Planning (Q3/2007)Planning (Q3/2007) NRAO will modify 1 lateral pad across streetNRAO will modify 1 lateral pad across street Remaining 6 will be modified at LBTO by Remaining 6 will be modified at LBTO by

NOAO in late Aug./early Sept.NOAO in late Aug./early Sept. Continue capillary installation of laterals, Continue capillary installation of laterals,

followed by radials and azimuthfollowed by radials and azimuth systematic measurement of lift, tuning systematic measurement of lift, tuning

system to maximize stiffnesssystem to maximize stiffness replace hoses with hard pipe on level 5replace hoses with hard pipe on level 5

10-Jul-200710-Jul-2007 LBT Q2 2007 Engineering RevieLBT Q2 2007 Engineering Revieww

PLC Programming GoalsPLC Programming Goals Remedy communication problem between Remedy communication problem between

LBTO WinCC computer and VoltsDC in LBTO WinCC computer and VoltsDC in Chandler.Chandler.

Complement WinCC Engineering override Complement WinCC Engineering override code to provide data-logging at ~10 Hzcode to provide data-logging at ~10 Hz

Rewrite PLC code to control pressure Rewrite PLC code to control pressure directly, not use lookup table.directly, not use lookup table.

Identify and correct why PLC does not Identify and correct why PLC does not shutdown system when pocket pressures failshutdown system when pocket pressures fail

10-Jul-200710-Jul-2007 LBT Q2 2007 Engineering RevieLBT Q2 2007 Engineering Revieww

Hydraulic GoalsHydraulic Goals Cut the oil flow, cooling and power to the Cut the oil flow, cooling and power to the

bearings by more than half.bearings by more than half. Improve the static stiffness of the bearings by Improve the static stiffness of the bearings by

10%10% Reduce system pressure from 120 to 95 bar.Reduce system pressure from 120 to 95 bar. Improve the dynamic stiffness of the Lateral Improve the dynamic stiffness of the Lateral

bearing by about 500%.bearing by about 500%. Moving the capillaries to the pads and resizeMoving the capillaries to the pads and resize Eliminate the internal ateral oil return groves.Eliminate the internal ateral oil return groves. Relocate the Lateral return hole.Relocate the Lateral return hole.