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Power Supplies and Power Supply Fan Assemblies
Notes:
1. Each drawer can have up to two power supplies. You can replace each power
supply separately. The removal and replacement procedures are the same for each
power supply.
2. This procedure applies to the CEC and I/O drawer power supplies.
3. Power supplies for the CEC and I/O drawers cannot be interchanged.
4. If a drawer has two power supplies, each is hot-pluggable. If only one needs to be
removed, you do not have to power off the system.
5. Each power supply has a test switch. See "Power Supply Test Switch Procedure" on
page 457.
6. If your drawer has only one power supply, the unused power supply position must
be filled with a cooling unit, which must have a power supply fan assembly attached
to it.
7. Do not hot-plug a power supply if the ambient room temperature is greater than
32°C (90°F), as it can cause loss of data or data corruption.
8. Be sure that the replacement power supply (or cooling unit) is ready to install. If the
power supply (or cooling unit) is removed for longer than four minutes, a shutdown
command is issued to the operating system.
9. Power supply 1 fan assembly (fans 1 and 2) is located on the rear of the primary
power supply. Power supply 2 fan assembly (fans 3 and 4) is located on the rear of
the secondary power supply. If only one fan in a fan assembly is bad, the fan
assembly must be replaced. Power supply fan 5 is located in the primary power
supply and if that fan fails, the power supply must be replaced. Power supply fan 6
is located in the secondary power supply and if that fan fails, the power supply must
be replaced. Fan 9 is located in the cooling unit.
Attention:
examine the system error logs to make sure power supply or power supply fan errors
are not being logged.
454
Service Guide
After hot-plugging a power supply, wait at least 5 minutes and then
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