Lenovo System x3550 M5, Installation And Service Manual

Page: 75 / 1144

The following minimum configuration is required for the dc LED on the power supply to be lit:
• Power supply
• Power cord
Note: You must turn on the server for the dc LED on the power supply to be lit.
The following illustration shows the locations of the power-supply LEDs on the ac power supply.
0000000
0000000
0000000
0000000000
0000000000
0000000000
000000
000000
000000 0
0
0
00000
00000
0
0
0
000
00
0
0
00
00000000
00000000
0
0
00
00
00
0
ac
dc
Figure 30. ac power-supply LEDs
The following table describes the problems that are indicated by various combinations of the power-supply
LEDs on an ac power supply and suggested actions to correct the detected problems.
ac power-supply LEDs
ac dc Error (!) Description Action Notes
On On /
Blinking
Off Normal operation.
On Blinking Off Zero Output mode The zero output mode
is used to configure
the power supply
behavior as standard
redundant mode or
zero-output mode
by the host system.
When the power
supply is configured
to this mode, minimal
power consumption
is maintained. At the
same time, the power
supply will keep its
fan rotating, and the
PSU LED should blink
at a rate of 1 Hz.
Chapter 3
.
Troubleshooting
61