IBM eServer 370 xSeries, User Reference Manual

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Power supplies
Your server comes with three hot-swap power supplies. The power supplies can
provide up to 550 watts each at 110 V ac input power, and 750 watts each at 220
V ac input power.
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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.
In addition to the power supplies, your server comes with 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 a
power supply has failed and the Power Good light is on, the dc power LED on the
power supply is off. See “Power supply LEDs” on page 156 for more information
on the dc power LEDs. See “Replacing a hot-swap power supply” on page 84 for
complete details on the power supplies.
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.
Chapter 1. Introducing the IBM xSeries 370
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