AC Power Connection
The AC power cords are the direct connection between the
server power supplies and the power sources. The server power
supplies need separate stable AC circuits. Insufficient voltage
levels or fluctuations in power can cause server power problems.
The power supplies are designed to operate at a particular
voltage and within an acceptable range of voltage fluctuations
(refer to Electrical Requirements in
Oracle Servers X8-2 and X8-2L
Verify that both AC power cords are connected to the server.
Verify that the correct power is present at the outlets and
monitor the power to verify that it is within the acceptable
range. You can verify proper connection and operation by
verifying the power supply (PS) indicator panels, which are
located at the back of the server on the power supplies. Lit
green AC OK indicators show a properly functioning power supply.
An amber AC OK indicator indicates that the AC power to the
power supply is insufficient.
Use the AC power cord Velcro retaining clips and position the
cords to minimize the risk of accidental disconnection. Ensure
that the AC circuits that supply power to the server are stable
and not overburdened.
Power Supplies (PSUs)
The server power supply units (PSUs) provide the necessary
server voltages from the AC power outlets. If the power supplies
are inoperable, unplugged, or disengaged from the internal
connectors, the server cannot power on.
Use the Velcro straps on the back of the server to secure
the power cord connectors to the back of the power supplies.
The Velcro retaining straps minimize the risk of accidental
Verify that the AC cables are connected to both power
supplies. Verify that the power supplies are operational (the
PSU indicator panel must have a lit green AC OK indicator).
Ensure that the power supply is properly installed. A power
supply that is not fully engaged with its internal connector
does not have power applied and does not have a lit green AC OK
When a power supply fails, replace it immediately. To ensure
redundancy, the server has two power supplies. This redundant
configuration prevents server downtime, or an unexpected
shutdown, due to a failed power supply. The redundancy allows
the server to continue to operate if one of the power supplies
fails. However, when a server is being powered by a single power
supply, the redundancy no longer exists, and the risk for
downtime or an unexpected shutdown increases. When installing a
power supply, ensure that it is fully seated and engaged with
its connector inside the drive bay. A properly installed power
supply has a lit green AC OK indicator.
The server top cover maintains the air pressures inside the
server, prevents accidental exposure to hazardous voltages, and
protects internal components from physical and environmental
Do not operate the server without the top cover installed
unless you are hot-plugging a fan module, and then ensure that
you complete the operation and replace the cover within 20
seconds. For instructions for properly replacing fan modules,
see Servicing Fan Modules
. For instructions for installing the server top
cover, see Install the Server Top
Be careful to avoid bending or otherwise warping the top