Steps - Intel SYSTEM 310 Hardware Integration Manual

System 310
Calculating System Compatibility
Table 3~3 expands the part-level information in Table 3-2 to arrive
at system-level information. Table 3-3 lists each preconfigured
system and the total amount of power it requires, built from the data
in Table 3-2.
The data is built as follows. The +5 VDC, +12 VDC, and -12 VDC
columns in Table 3-3 are the sum of the numbers in the corresponding
columns in Table 3-2 for each system configuration. The "Watts"
column contains the total power consumed. This column is calculated
by applying the power formula (P=IE; where P is watts, I is amps, and
E is volts).
Table 3-3. DC Power Consumed by Each System
System
+5 VDC
(amps)
+12 VDC
(amps)
-12 VDC
(amps)
Watts
(P=IE)
310-1
6.73 1.35
0.35 54.05
310-2
15.83 3.75 0.35
133.35
310-3 17.04
3.75 0.35 134.40
310-4
14.83 1.35 0.35
94.55
310-5 21.23
3.75 0.35
155.35
Tables 3-2 and 3-3 can serve as models for calculating requirements
for modified systems. Once you arrive at the amount of power your
modified system will consume, you can use Table 3-1 to verify that
this figure does not exceed the total amount of watts allowed by the
power supply (220 watts).
Using Tables 3-1, 3-2, and 3-3, you can calculate this figure in two
steps:
1. Subtract the total number of amps in each voltage category
shown in Table 3-3, from the totals shown in Table 3-1.
For
example, subtract 6.73 amps (shown in the +5 VDC column of
Table 3-3) from 30 amps (shown as the maximun DC current
available in Table 3-1). This leaves 23.27 amps of +5 volts
remaining. Do the same for -12 and +12 volt categories.
2. When you have calculated the amount of DC current your
modification will consume, apply the P=IE formula. Continuing
the example, you would multiply 6.73 amps by 5 volts to get
33.65 watts. Calculate the number of watts consumed for the
-12 and +12 voltages, then add them together. In the example,
this total is 54.05 as shown in the "Watts" column of Table 3-3.
If this number exceeds 220 watts, you must redesign your
system.
3-5