LBT Q 3 2007 Engineering Review MCSC Mount

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LBT Q 3 2007 Engineering Review MCSC Mount Control System 26 -Oct-2007 LBT Q

LBT Q 3 2007 Engineering Review MCSC Mount Control System 26 -Oct-2007 LBT Q 3 2007 Engineering Review

Highlights (Q 3/2007) n n n Identified source of azimuth encoder signal nulls Azimuth

Highlights (Q 3/2007) n n n Identified source of azimuth encoder signal nulls Azimuth encoder declared salvageable Elevation motor brushes inspected and one replaced due to heat damage 26 -Oct-2007 LBT Q 3 2007 Engineering Review

Open Issues n Technical n n n Schedule n n None Financial n n

Open Issues n Technical n n n Schedule n n None Financial n n Occasional unexplained elevation tracking errors ELFR motor winding damage from Q 1/07. Brush failure suspected. Low azimuth and elevation acceleration Unexplained phase discrepancy between azimuth and elevation encoder signals Elevation brake capacity appears to be diminished to less than 206 k. N*m Postponed ordering spare azimuth encoder tape on financial grounds Resource n n MCS competing for resources mainly against rotator development effort Azimuth encoder progress in Q 4/07 is contingent on progress made on issue #772. 26 -Oct-2007 LBT Q 3 2007 Engineering Review

Progress (Q 3/2007) n Planning From Q 2 Review n n n Elevation and

Progress (Q 3/2007) n Planning From Q 2 Review n n n Elevation and azimuth motor brush inspected and if necessary replaced √ Order replacement azimuth encoder tape – postponed Q 1/08 Azimuth encoder tests planned for Q 4/07 – on scheduled Tape installation expected in Q 4/07 – canceled Additional Progress n n Damaged tape salvageable Identified source of azimuth encoder tape signal nulls 26 -Oct-2007 LBT Q 3 2007 Engineering Review

Planning (Q 4/2007) n n Install azimuth main encoder read heads Commission azimuth encoder

Planning (Q 4/2007) n n Install azimuth main encoder read heads Commission azimuth encoder Inspect/repair elevation brakes Order azimuth encoder tape Q 1/08 26 -Oct-2007 LBT Q 3 2007 Engineering Review