IBM DCS3860, Installation, User'S, And Maintenance Manual

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The power supplies are customer replaceable units (CRUs) and do not require
preventive maintenance. Use only the supported power supplies for the storage
system.
Each power supply has a built-in sensor that detects the following conditions:
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Over-voltage
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Over-current
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Overheated power supply
If any of these conditions occurs, one or both power supplies will shut down. If
the power remains off (does not automatically restart), ensure that the environment
is optimal (no overheating has occurred, all electrical receptacles are working, and
so on).
If both power supplies fail or if the power supplies cannot maintain an internal
temperature below 65°C (149°F), the power supplies will automatically shut down
(an overtemperature condition). If this occurs, you must cool the storage system
and restart it.
Attention: Do not remove the failed power supply until you have the
replacement power supply. Continuous air flow cools the storage system. Any
interruption in the air flow might result in overheating, so if you remove the failed
power supply, install the second power supply within five minutes. .
Do not run the storage system without adequate ventilation and cooling, because it
might cause damage to the internal components and circuitry.
Before you begin:
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Use the Storage Manager software to print a storage system profile, if required.
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Read the "Safety" section of this document.
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Ensure that you wear an anti-static wrist strap.
Chapter 5. Replacing components
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