Ultra Start 450 SERIES Instruction Manual download pdf (Page 100)

80 Ultra Enterprise 450 Server Owner’s Guide • July 1997

Caution – The power supply configuration cannot support the maximum values on

all three outputs at the same time because that would exceed the total power supply

output capacity. The load can be distributed between the outputs in any way that

does not violate their maximum values or exceed the total output capacity of the

power supply configuration. For a single supply configuration, the combined +3.3 V

and +5 V output cannot exceed 400 W. For a two power supply configuration, the

combined output cannot exceed 800 W. Therefore, you must also calculate the total

DC current draw on the +3.3 V and +5 V power supply outputs.

Power Supply Output Capacity

Using your values for the DC current draw on each power supply output, you then

calculate the total power consumption (total watts) of your system. You must ensure

that the total watts required for your system does not exceed the maximum output

capacity of the power supply configuration.

The maximum output capacity of a single power supply is 560 watts. The maximum

output capacity of two power supplies is 1120 W.

You can also use the total watts required to determine the proper power supply

configuration for your system—how many supplies you need to power your system

and to provide power supply redundancy, if required. See “About Power Supplies”

on page 64 for information about power supplies and configuration rules.

In addition, you can use the total watts (also known as DC watts) to calculate AC

watts, thermal dissipation and Volt-Amps for your configuration. These values are

used in facility planning. For convenience, these calculations are provided in “How

to Determine System Power Requirements” on page 82.

Note – The system has built-in protection against exceeding the output capacity of

the power supply configuration. If your configuration exceeds the recommended

operational capacity of the power supply configuration, the general fault indicator

( ) illuminates on the LED and control panel but the system continues to operate

until you can correct the problem. If the configuration exceeds the safety threshold

for power supply operation, then the system shuts itself off automatically.

See “About the Status and Control Panel” on page 8 for information about the

general fault indicator.

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Ultra Start 450 SERIES Instruction Manual Page 100