User's Manual

338 Troubleshooting and Recovery
Executing a Power Control Operation
For instructions on powering on, powering off, resetting, or power-cycling the
system using the CMC Web interface or RACADM, see "Executing Power
Control Operations on the Chassis," "Executing Power Control Operations on
an IOM," and "Executing Power Control Operations on a Server."
Power Supply Troubleshooting
Use the items below to assist in troubleshooting power supply and
power-related issues:
• Problem: Attempted to configure the Power Redundancy Policy to
AC Redundancy, but it failed.
–
Resolution A : This operation requires 2, 4, or 6 power supplies (1, 2,
or 3 in each grid) receiving input power to be present and functional in
the modular enclosure. For full
AC Redundancy operation, ensure
that a full PSU configuration of six power supplies is available before
an attempt is made to change the redundancy policy to
AC Redundancy .
–
Resolution B: Check if all power supplies are properly connected to
the two AC grids; the left three power supplies need to be connected
to an AC grid and the right three power supplies need to be connected
to the other AC grid, and both AC grids are working. You cannot
configure power redundancy to
AC Redundancy when one of the
AC grid is not functioning.
•
Problem: The PSU state is displayed as Failed (No AC), even when an
AC cord is connected and the power distribution unit is producing
good AC output.
–
Resolution: Check and replace the AC cord. Check and confirm that
the power distribution unit providing power to the power supply is
operating as expected. If the failure still persists, call Dell customer
service for replacement of the power supply.