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 is ready to install. If the power supply 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: Several emergency power-off warnings (error codes) can be logged to the system error logs
during the removal and replacement of a power supply with the power turned on. These errors can be
logged as long as five minutes after a hot-plug operation is performed. After hot-plugging a power supply,
wait at least 5 minutes and then examine the system error log. Ensure that no power supply errors or
power supply fan errors are being logged after the five minute time delay.
Chapter 10. Removal and Replacement Procedures 449
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