Current Usage
121
Worksheet, Calculating DC Power Usage
1.
List the current for each board and device in the appropriate voltage level column of
Table A-2.
2. Add the currents in each column. Then go to the next worksheet.
Table A-2
Power Usage Worksheet
Device, by Current (maximum)
at voltage level:
+3.3 V
+5 V
–5 V
+12 V
–12 V
Boards, processors, and memory (get
totals from your board manual)
SCSI backplane
Front panel board
3.5-inch diskette drive
0.3 A
CD-ROM drive
0.4 A
1.0 A
Second 5.25-inch device
1st hot-swap hard drive
2nd hot-swap hard drive
3rd hot-swap hard drive
4th hot-swap hard drive
5th hot-swap hard drive
Cooling fan 1, 120 mm
0.6 A
Cooling fan 2, 120 mm
0.6 A
Cooling fan 3, 120 mm
0.6 A
Total Current
Summary of Contents for 1400
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