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User Guide
255
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AC Power LED
There is an AC POWER LED for the power supply unit on the rear. The LED turns
green and flashes when the power supply unit receives AC power from the power cord,
which is connected to the AC inlet. (Flashing amber indicates no AC power is received
in any one of two power supplies in the redundant configuration.)
The LED turns green when the server power switch is turned on. If the LED does not
go on when the server power switch is turned on or if it turns amber, the power supply
unit is probably faulty. In this case, contact your service representative to replace the
power supply unit.
Figure 194: AC Power LED
A: Power supply slot 2
B: Power supply slot 1
1: AC inlet
2: AC Power LED
Note:
■
If one power supply unit fails while an optional power supply
is mounted, the system can continue operation with the
other power supply unit (redundant function). The failing
power supply unit can be hot-swapped, that is, replaced
without shutting down the system.
■
In configuration of two power units, AC power may be sup-
plied only to a single power unit through the power cord con-
nected to the power unit. If so, the power lamp on the other
power unit (to which a power cord is not connected) blinks
amber. When a power cord is connected to the power unit to
supply AC power, the lamp changes to blink green. If the
lamp still blinks amber, contact your service representative
to ask maintenance.
2
1
A B