Ultra Start 450 SERIES Manuel d'instructions Page 99

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Chapter 4 Hardware Configuration 79
About Power Budget Constraints
You must ensure that your configuration does not
exceed the power budget constraints of the system.
This section describes the following three areas in which system power budget
constraints occur:
Maximum rated values for the +3.3, +5, and +12 VDC power supply outputs
Total power supply output capacity
Current limit of the AC power outlet
“How to Determine System Power Requirements” on page 82 provides the
information that you need to calculate your power budget. It includes a worksheet
that lists the amps required for the basic system and all internal options at +3.3 VDC,
+5 VDC, and +12 VDC. It also provides a procedure that steps you through the
worksheet to calculate the values that you need.
You must determine the power requirements of your configuration when you first
install the system and also whenever you add an option. Therefore, you should save
the worksheet and store it in a safe and convenient location so that you don’t have
to recalculate the power budget for the entire system when you install a new option.
+3.3 VDC, +5 VDC, and +12 VDC Maximum
Rated Values
Using the worksheet and procedure provided in “How to Determine System Power
Requirements,” you first calculate the DC current draw on each power supply
output (+3.3 VDC, +5 VDC, and +12 VDC). You must ensure that the total for each
is within the maximum rated value for that output. The following table provides the
maximum rated values for one supply and two supply configurations.
Maximum Rated Value
Power Supply Output One Power Supply Two Power Supplies
1
1. A third supply can only be used to provide redundancy — not to increase power capacity.
+3.3 VDC 47 A 94 A
+5 VDC 65 A 130 A
+12 VDC 16 A 32 A
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