Installing a hot-swap ac power supply
The following notes describe the type of power supply that the server supports and
other information that you must consider when you install a power supply:
v The server comes with one 675-watt hot-swap 12-volt output power supply that
connects to power supply bay 1. The input voltage is 110 V ac or 220 V ac
auto-sensing.
v Power supply 1 is the default/primary power supply. If power supply 1 fails, you
must replace the power supply immediately.
v You can order an optional power supply for redundancy.
v These power supplies are designed for parallel operation. In the event of a
power-supply failure, the redundant power supply continues to power the system.
The server supports a maximum of two power supplies.
v For instructions on how to install a hot-swap dc power supply, refer to the
documentation that comes with the dc power supply.
Statement 5:
CAUTION:
The power control button on the device and the power switch on the power
supply do not turn off the electrical current supplied to the device. The device
also might have more than one power cord. To remove all electrical current
from the device, ensure that all power cords are disconnected from the power
source.
1
2
Statement 8
CAUTION:
Never remove the cover on a power supply or any part that has the following
label attached.
Hazardous voltage, current, and energy levels are present inside any
component that has this label attached. There are no serviceable parts inside
these components. If you suspect a problem with one of these parts, contact
a service technician.
212 IBM System x3550 M3 Types 4254 and 7944: Problem Determination and Service Guide
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