Replacing A Hot-Swap Power Supply - IBM eServer 370 xSeries User Reference Manual

Replacing a hot-swap power supply

13
Your server comes with three power supplies, three 220 V ac power cords, and
three 110 V ac power cords (U.S. only). Be sure to select the appropriate power
cord voltage for your server environment. All three power cords must have the
same voltage.
If you connect all three power cords of the same voltage to the power supplies, the
three power supplies support redundancy and hot-swap capability.
For servers with redundant power, the loss of a single power supply will not affect
the server operation. Replace a power supply that has failed as soon as
convenient to help maintain the redundant power and cooling capability. When the
ac power LED is on, the dc power LED is on, and the System Power light on the
operator panel is on, the power supply has failed. See "Power supplies" on
page 13 for the location of the dc power LEDs. See "Power supply LEDs" on
page 156 for more information on the dc power LEDs.
Attention: To ensure proper server operation, be sure to connect all three 220 V
ac power cords or all three 110 V ac power cords to the power supplies.
Note: Your server also comes with three 220 V ac power cords for connection to
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xSeries 370 User's Reference
DANGER
Overloading an electrical circuit breaker is potentially a fire
hazard and a shock hazard under certain conditions. To avoid
these hazards, adhere to the instructions in the following
statements.
1. If you are connecting to a 100–127 V ac power source,
connect each power cord to a separate branch circuit.
2. If you are connecting to a 200–240 V ac power source and
the branch circuit breaker rating is:
a. 13 amps or less, connect each power cord to a separate
branch circuit.
b. 14 amps to 19 amps, do not connect more than two
power cords to the same branch circuit.
c. 20 amps or greater, you may connect up to three power
cords to the same branch circuit.
the server rack power distribution unit (PDU). Refer to the documentation
that comes with your PDU option for additional information on installing a
PDU. Refer to the Rack Mounting Instructions for additional information on
installing a server in a rack.