Troubleshooting Power Issues - Oracle X5-2L Service Manual

Prevention: Component redundancy is provided to allow for component failure in critical
subsystems, such as the cooling subsystem. However, once a component in a redundant
system fails, the redundancy no longer exists, and the risk for server shutdown and component
failures increases. Therefore, it is important to maintain redundant systems and replace failed
components immediately.

Troubleshooting Power Issues

If your server does not power on, the cause of the problem might be:
"AC Power Connection" on page 37
■
"Power Supplies (PSUs)" on page 37
■
"Top Cover" on page 38
■
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 Power Requirements" in "Oracle Server X5-2L Installation Guide
Action: Check that both AC power cords are connected to the server. Check 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 checking 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.
Prevention: 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 supplies (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.
The Velcro straps shown in the following figure should be used to secure the power cord
Note -
connectors to the rear of the power supplies. The Velcro retaining straps minimize the risk of
accidental disconnection.
Troubleshoot Hardware Faults Using the Oracle ILOM Web Interface
").
Troubleshooting and Diagnostics 37