CAUTION:
To reduce the risk of electric shock or energy hazards:
v This equipment must be installed by trained service personnel in a
restricted-access location, as defined by the NEC and IEC 60950-1, First
Edition, The Standard for Safety of Information Technology Equipment.
v Connect the equipment to a reliably grounded safety extra low voltage (SELV)
source. An SELV source is a secondary circuit that is designed so that normal
and single fault conditions do not cause the voltages to exceed a safe level (60
V direct current).
v Incorporate a readily available approved and rated disconnect device in the
field wiring.
v See the specifications in the product documentation for the required
circuit-breaker rating for branch circuit overcurrent protection.
v Use copper wire conductors only. See the specifications in the product
documentation for the required wire size.
v See the specifications in the product documentation for the required torque
values for the wiring-terminal nuts.
The dc power supplies are customer replaceable units (CRUs) and do not require
preventive maintenance. Use only the supported dc power supplies for the storage
subsystem.
Each dc power supply 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 (does not automatically restart), ensure that the environment
is optimal (no overheating has occurred, the dc power source is working, and so
on). For more information, see “Restoring power after an unexpected shutdown”
on page 98.
If both dc 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 subsystem
and restart it. See “Restoring power after an unexpected shutdown” on page 98.
Attention: The fans in the dc power supplies draw in fresh air and force out hot
air. The dc power supplies are hot-swappable and redundant; however, if the fans
in one power supply fail, you must replace the entire failed power supply within
72 hours to maintain redundancy and optimum cooling. Do not remove the failed
power supply until you have the replacement power supply. When you do remove
the failed power supply, be sure to install the second power supply within 10
minutes to prevent any overheating due to the interruption to the air flow that
cools the storage subsystem.
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.
To replace a dc power supply, complete the following steps.
138 IBM System Storage DS3500 and EXP3500 Storage Subsystem: Installation, User's, and Maintenance Guide
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