v
Over-voltage
v
Over-current
v
Overheated power supply
If any of these conditions occurs, one or both dc 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 dc power supply and fan units fail, or if the dc power supply and fan units
cannot maintain an internal temperature below 68° C (154° F), the dc power supply
and fan units in the storage expansion enclosure will automatically shut down (an
over-temperature condition). If this occurs, you must cool the storage expansion
enclosure and restart it. See “Restoring power after an unexpected shutdown” on
page 83.
Attention:
The fans in the dc power supply and fan units draw in fresh air and
force out hot air. The dc power supply and fan units are hot-swappable and
redundant; however, if the fans in one dc power supply and fan unit fail, you must
replace the entire failed dc power supply and fan unit within 72 hours to maintain
redundancy and optimum cooling. Do not remove the failed dc power-supply fan
unit until you have the replacement dc power supply and fan unit. When you do
remove the failed dc power supply and fan unit, be sure to install the second dc
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 a dc power supply and fan unit. Figure 54
on page 108 illustrates removing and inserting a unit.
Attention:
Potential
damage
to
a
component
-
To prevent damage from
overheating, replace a failed dc power supply and fan unit CRU within 15 minutes
of removal. If replacing it will take longer than 15 minutes, stop all I/O activity to the
storage expansion enclosure and turn off the power until you complete the
replacement.
Statement
8:
Chapter 5. Installing and replacing components
111
Summary of Contents for DS4000 EXP810
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