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U41243-J-Z156-1-76 95
System expansions Power supply units
8.3.1 Replacing a power supply unit
If a power supply unit fails the yellow power supply failure LED on the front panel
turns on. The defective power supply unit can be replaced without turning the
server power off.
V CAUTION!
Because of chassis airflow disruption, the power supply unit bay should
not be vacant and/or not covered for more than five minutes when server
power is on. Exceeding the five-minute limit may cause damage to
certain drives.
Ê Look at the yellow LED (2) on the back side of the server (see figure 22 on
page 94) to determine which power supply unit is defective.
LED
green
(1)
LED
yellow
(2)
LED
yellow
(3)
Description
OFF OFF OFF No AC power.
blinking OFF OFF No AC power; standby outputs on.
ON OFF OFF DC outputs on. Power supply unit okay.
OFF ON OFF Power supply unit failure.
ON blinking/
none
latch
OFF Current limit.
ON OFF blinking/
latched
„Predictive Failure“: The power supply unit
is about to fail in the near future because
the fan is performing poorly. The power
supply unit should be exchanged as soon
as possible.
Table 25: Power supply unit status monitoring