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Preparing to Install VME Options
If the current draws are within the maximum provided by each power source,
continue verifying your power requirements by calculating the wattage total for
the planned system.
6. Refer to the technical specifications in the computer's installation manual to
determine the output of your power supply. Enter the output value on your
calculation form in the "Available" column of the Power Supply/Wattage section.
7. Multiply the number of volts from each power source (+5, +12, and –12) by the
corresponding amperage totals you calculated in step 4. Enter the results on
your calculation form in the "Watts Used" column of the Power Supply/Wattage
section.
8. Add the wattage values for each voltage source and enter the total in the lower
right corner of your form as "Total Watts Used."
9. Compare the maximum wattage supplied by your power supply (step 6) with
the total watts used by all sources from step 8.
If the total wattage consumed by the devices in your proposed configuration
exceeds the capabilities of your computer unit's power supply, the configuration
will not work; recalculate your current requirements and/or plan another
system configuration.
Figure 1–2 shows a completed calculation form for an AViiON computer with four
memory boards, a non-graphics system console, and a 330-watt power supply.
Appendix B includes extra forms that you can copy.
If your proposed new configuration meets all the power requirements described in
this section, you should now determine where to physically install your VME option
boards. Continue with the next section to assign slots along the VMEbus to your
option boards.
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