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4. Check the LEDs.
Working with hot-swap power supplies
The storage server power system consists of two power supply CRUs. The power
supply CRUs provide power to the internal components by converting incoming ac
voltage to dc voltage. One power supply CRU can maintain electrical power to the
unit if the other power supply is turned off or malfunctions. The power supply CRUs
are interchangeable (by reversing the locking levers).
Each power supply CRU has a built-in sensor that detects the following conditions:
v Over-voltage
v Over-current
v Overheated power supply
If any of these conditions occurs, one or both power supplies will shut down. All
power remains off until you cycle the power switches (turn the power switches off,
wait at least 30 seconds, then turn the power switches on). For more information,
see "Restoring power after an unexpected shutdown" on page 40 and "Restoring
power after an over-temperature shutdown" on page 41.
The power supplies are customer replaceable units (CRUs) and do not require
preventive maintenance.
v Always keep the power supplies in their proper places to maintain proper
v Use only the supported power supplies for your specific storage server.
The power-supply controls on the rear of the storage server are shown in Figure 45
b. Hold the latch open, and slide the fan all the way into the slot. If the fan
does not go into the bay, rotate it 180°. Ensure that the latch is on the side
closest to the center of the storage server.
c. Release the latch. If the lever remains open, pull back on the fan slightly,
and then push it in again until the latch snaps into place.
The Fault LEDs turn off after a few seconds. If they remain on, see
"Troubleshooting" on page 74.
controller-unit cooling.
on page 60.
Chapter 5. Installing and replacing components
59
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