1. HOBBY - EBERLY TELESCOPE: MARS2 ALM 1 11/6/02 ELECTRONIC CONTROLS DESIGN REVIEW Addendum 1 Dissipated Power Estimates, MARS2 Control Computer Chassis CyberResearch, Incorporated - estimate 105 Watts –MARS2 Rack Mount Control Computer Chassis CD Drive –5VDC @ 1A = 5W –12VDC @ 0.1A = 1.2W Seagate Barracuda HD –5VDC @ 1.11A = 5.55W –12VDC @ 0.72 = 8.64W Cooling fans –12VDC @ 0.45A = 5.4W x 4 = 21.6W –MARS2 Single Board Computer 5VDC @ 10A = 50W +12VDC @ 0.1A = 1.2W -12VDC @ 0.1A = 1.2W

2. HOBBY - EBERLY TELESCOPE: MARS2 ALM 2 11/6/02 ELECTRONIC CONTROLS DESIGN REVIEW Addendum 1 Dissipated Power Estimates, PMAC2 Components Delta Tau Data Systems: PMAC2 8-axis motion control system –PMAC2-PC 5VDC @ 4A = 20W +12VDC @ 0.1A = 1.2W -12VDC @ 0.1A - 1.2W –ACC-8D OPT-6 5VDC @ 0.1A = 0.5W –ACC-8E +12VDC @ 0.2A = 2.4W -12VDC @ 0.2A - 2.4W –ACC-8S 5VDC @ 0.2A = 1W x 3 = 3W –ACC-14D 5VDC @ 1A = 5W x 4 = 20W

3. HOBBY - EBERLY TELESCOPE: MARS2 ALM 3 11/6/02 ELECTRONIC CONTROLS DESIGN REVIEW Addendum 1 Dissipated Power Estimates, MARS2 Control System MARS2 Drive Chassis –Chassis Cooling Fan, 115VAC @ 0.2A rms = 23W IMS Power Supply plus Motor Driver plus Stepper Motor –Drive Power Supply, 24VDC @ 6A = 144 Watts per motor energized –Logic power supply, 5VDC @ 0.1A = 0.5 Watts per motor axis –3A/Ph @ 0.9Ω => 8.1W/Ph x 2 = 16.2 Watts per motor energized Failsafe Brake –12VDC @ 0.6A = 7.2W x 7 = 50.5 Watts total when all brakes energized Absolute Encoder –5VDC @ 0.2A = 1W x 7 = 7 Watts total with all encoders powered