2. Justification  The Observatory Automation project required the Dome Drive System to be remotely operated and provide monitoring capabilities Conduct a Feasibility study  Things to consider  Options Retrofit the current hydraulic system Upgrade the current hydraulic systemUpgrade to an electronically controlled motor drive system

3. Or……Option #4 Hamster power!

4. Results from testing

5. Conceptual Design reviews  Assessment of the choices equally  apples to apples comparison Evaluate and Distinguish best choice Upgrade to electronically controlled motor drive system Upgrade the current hydraulic system Current hydraulic system

6. Electric dome drive plan Design solution to replace the hydraulic power unit and hydraulic motors and operate the dome drive system with electronically controlled motor units. Specifications and Requirements formed Calculations and data gathering Detailed design changes, anticipated costs, design reviews

7. Beneficial Features and Improvements  Increased speed capability from  60deg/min to 72deg/min  Increased system efficiency  Hydraulic system η~30%  Electric system η~92%  Reduced electrical consumption  Reduced Environmental footprint  Reduction of leak hazardous  Reduced mechanical maintenance  Will save 5-10k a year, amount currently spent on hydraulic system.  Nominal cost difference between options  Reliability  Can operate with one drive out of service  Designing for the future

8. Design solution actuator Hydraulic actuator replacement with Pneumatic actuator Solenoid valve Uses building air, 100-110psi, solenoid valve draws only 2 watts of power.

9. Design Solution motor Drive unit Replace Hydraulic power unit with Electric motor drive controller Replace Manual control station Hand Held Pendent

10. Location control cabinet Keypad interface *Eliminates heat source on 5 th floor Location on 4 th floor

11. Brevini Gear reduction box SHP Main shaft assembly SHP wheel assembly Hydroland Hydraulic motor Re-use Replace

12. Baldor RPM AC 20 HP motor 1750RPM3PH 60HZ Electric motor Adapter kit New configuration Brevini Nema 250 TC Motor adapter flange Rotate assembly up to achieve more clearance.

13. Any Additional Questions or Comments? Thank you for your time!