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 60.
The storage subsystem cooling system consists of two fans in each of the two
power supply and fan unit FRUs. 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 60.
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.
Before you begin, ensure that you wear an anti-static wrist strap.
Use the following procedure to replace an ac power supply and fan unit. Figure 36
on page 82 illustrates removing and inserting a unit.
Attention:
Potential damage to a component -
To prevent damage from
overheating, replace a failed power supply and fan unit FRU 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
79
Summary of Contents for DS3950
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