1
2
CAUTION:
Disconnect
the
power
cord
before
replacing
the
power
supply
and
fan
unit.
The power supply and fan unit is a component that includes both a 600-W power
supply unit and two fans. The power supply and fan units provide power and
cooling for the EXP810. The power supply and fan units are customer replaceable
units (CRUs) and do not require preventive maintenance. Use only the supported
power supply and fan units for your specific storage subsystem.
Each power supply and fan unit 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. If the
power remains off after the condition that causes it to go off, make sure that the
environment is optimal (no overheating has occurred, all electrical outlets are
working, and so on). For more information, see “Restoring power after an
unexpected shutdown” on page 83.
The storage subsystem cooling system consists of two fans in each of the two
power supply and fan unit CRUs. The power supply and fan units circulate air from
the front to the back of the unit.
If both power supply and fan units fail, or if the power supply and fan units cannot
maintain an internal temperature below 68° C (154° F), the power supply and fan
units in the unit will automatically shut down (an over-temperature condition). If this
occurs, you must cool the unit and restart it. See “Restoring power after an
unexpected shutdown” on page 83.
Attention:
The fans in the power supply and fan units draw in fresh air and force
out hot air. The power supply and fan units are hot-swappable and redundant;
however, if the fans in one power supply and fan unit fail, you must replace the
entire failed power supply and fan unit within 72 hours to maintain redundancy and
optimum cooling. Do not remove the failed power-supply fan unit until you have the
replacement power supply and fan unit. When you do remove the failed power
supply and fan unit, be sure to install the second power supply and fan unit within
10 minutes to prevent any overheating due to the interruption to the air flow that
cools the storage expansion enclosure.
Do not run the storage subsystem without adequate ventilation and cooling,
because it might cause damage to the internal components and circuitry.
Use the following procedure to replace an ac power supply and fan unit. Figure 54
on page 108 illustrates removing and inserting a unit.
Chapter 5. Installing and replacing components
105
Summary of Contents for DS4000 EXP810
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