HOBBY - EBERLY TELESCOPE: MARS2

ALM 111/6/02

ELECTRONIC CONTROLS DESIGN REVIEWAddendum 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

HOBBY - EBERLY TELESCOPE: MARS2

ALM 211/6/02

ELECTRONIC CONTROLS DESIGN REVIEWAddendum 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

HOBBY - EBERLY TELESCOPE: MARS2

ALM 311/6/02

ELECTRONIC CONTROLS DESIGN REVIEWAddendum 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