LBT Q1 2008 Eng/SW LBT Q1 2008 Eng/SW ReviewReview

TERCTertiary Mirror Units

Commissioning

4-Apr-20084-Apr-2008 LBT Q1 2008 Eng/SW ReviewLBT Q1 2008 Eng/SW Review

HighlightsHighlights Mirror installed Mechanism position moved (twice!) SX M3 installed and working M3 aligned with rotator gallery Failed motor encoder on SX M3 Site visit by ADS (Paolo Lazzerini) Ran the software on the mountain, Ran the software on the mountain,

performing moves in tip, tilt, piston and performing moves in tip, tilt, piston and rotationrotation

Showed that the various status bits worked Showed that the various status bits worked correctlycorrectly

4-Apr-20084-Apr-2008 LBT Q1 2008 Eng/SW ReviewLBT Q1 2008 Eng/SW Review

ProgressProgress

Install SX mirror √√ Fix mirror position √√ Complete and test software Build mirror safety devices Commissioning Perform acceptance tests

4-Apr-20084-Apr-2008 LBT Q1 2008 Eng/SW ReviewLBT Q1 2008 Eng/SW Review

Progress (cont.)Progress (cont.)

Installed SX linear actuator limit switches √√ Repaired broken sensor

Isolated motor encoder fault √√ Temporary fix implemented

Tested SX M3 in lab and on telescope √√ Tested DX M3 in lab √√

4-Apr-20084-Apr-2008 LBT Q1 2008 Eng/SW ReviewLBT Q1 2008 Eng/SW Review

Progress (cont.)Progress (cont.)

Spares moved to site Additional spares ordered

Limit switches Power supply

Software GUI testing Developed ‘unstick’ procedure Modified some parameters

Supported alignment

4-Apr-20084-Apr-2008 LBT Q1 2008 Eng/SW ReviewLBT Q1 2008 Eng/SW Review

Open IssuesOpen Issues

TechnicalTechnical Major software issues to be resolved Mirror safety devices pending Mechanical rebuild likely Encoder replacement likely Increased mechanical friction Unknown amplifier faults Units need to be changed for some commands. Functionality may be added to facilitate 'unsticking' the

rotator. Full testing still needs to be performed, as well as

determining the actual positions of the focal stations.

4-Apr-20084-Apr-2008 LBT Q1 2008 Eng/SW ReviewLBT Q1 2008 Eng/SW Review

Open IssuesOpen Issues

ScheduleSchedule Replacement of failed encoder Substantial additional work probably required

BudgetBudget >$1500 for replacement motor/encoder ~$3500 for spare rotator encoder Replacement of gearboxes (ADS?)

ResourceResource Could turn into a black hole! ADS?

4-Apr-20084-Apr-2008 LBT Q1 2008 Eng/SW ReviewLBT Q1 2008 Eng/SW Review

Planning (Q2/2008)Planning (Q2/2008)

Design and build mirror safety devices? Complete and test M3 software Program in the focal station positions Ensure the units are correct for the commands Order replacement motor encoder Order additional spares (Motor/Encoder, rotator

encoder) Replace limit switches on DX M3 Encoder/gearbox replacement? (Q3/2008) Mechanical rebuild (Q3/2008) Commissioning/acceptance tests (???)