failed and it must be replaced.
Yellow PR_FL (Predictive Failure) LED—when blinking, the power supply is about to fail in the near future because the fan is performing poorly.
Power Supply LEDs
Green PWR (Power) LED—when blinking, AC is applied to the power supply and standby voltages are available. When on continuously, all power outputs are ready.
Yellow FAIL(Power Supply Failure) LED—when on continuously, the power supply has
When the yellow power supply failure LED on the front panel turns on, you can determine which power supply is defective by checking the three status LEDs on the back of each supply. If a power supply fails, the yellow FAIL LED on the back of the power supply will be on continuously. You must hot-swap the power supply—remove and replace it—with a good one. If the server contains three power supplies, you DO NOT need to shut down the server to hot-swap a failed power supply.
You must have three power supplies installed to hot-swap a supply. If you have only two supplies installed, they must occupy the left and center bays (as you face the back of the server — see Figure 19 on page 89).

Hot-Swapping Power Supplies

NOTE

Power Supply Status

No AC power

AC in/standby outputs on

DC outputs on and okay

Power supply failure

Current limit

Predictive failure

PWR (power) (Green)

Off

Blinking

On

Off

On

On

FAIL (power supply failure) (Yellow)

Off

Off

Off

On

Blinking/None Latch

Off

PR_FL (predictive failure) (Yellow)

Off

Off

Off

Off

Off

Blinking/Latched

Hot-Swapping a Power Supply

In a fully configured server, the power system contains three 750 watt autoranging power supplies; the third one is redundant. If a single power supply fails in the redundant power system, the yellow power supply failure LED on the front panel turns on. You can easily hot-swap the defective power supply without turning the server power off.

Power supplies are hot-swappable only in configurations with three power supplies.

WARNING

Because of chassis airflow disruption, the power supply bay should not be vacant for more than five minutes when server power is on. Exceeding the five-minute limit may cause damage to certain peripheral components.

Before replacing a power supply in a two-power supply configuration, you must turn off power to the server.

88

Hot-Swapping Fans, SCSI Hard Drives, and Power Supplies

Page 88
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Intel SRPL8 manual Hot-Swapping Power Supplies, Hot-Swapping a Power Supply