Servicing Power Supplies
4.
Verify that the fan module status LED on the replacement fan module is lit green.
5.
Using your thumb and forefinger, tighten the captive screw to secure the fan
module to the chassis. Then use a No. 2 Phillips screwdriver to tighten the screw
an additional 1/4 turn to secure the fan module to the chassis [2].
6.
Close the top cover fan assembly door.
7.
Verify that the Top Fan Fault LED on the front of the server and the Service
Required LEDs on the front and rear of the server are extinguished.
See “Server System-Level Status Indicators” on page 27 for more information about identifying
and interpreting system status indicators.
8.
Consider your next step:
■
If you installed the fan module as part of another procedure, return to that procedure.
■
Otherwise, return the server to operation. See “Returning the Server to
Operation” on page 161.
Related Information
■
“Remove a Fan Module” on page 67
Servicing Power Supplies
The server's redundant power supplies support concurrent maintenance, which enables you to
remove and replace a power supply without shutting down the server, provided that the other
power supply is online and working.
The server supports model A258 (1000 watt) power supplies. The A258 power supply unit
(PSU) provides conversion from the AC lines to the system, accepting ranges from 100-240
volts AC (VAC). These PSUs are designed to be hot-swappable, and in most cases will provide
fully redundant “1+1” power, allowing the system to suffer the loss of a PSU or an AC feed
with no loss to system availability.
In maximally configured systems, it is possible that the worst-case power consumption of the
system could exceed the capacity of a single PSU. The PSUs provide an over-subscription
mode, which allows the system to operate with fault-tolerance even with modest excursions
beyond the rated capacity of a single PSU. This over-subscription support is accomplished
using hardware signaling between the PSU and motherboard circuitry, which can force the
Servicing Components That Do Not Require Server Power-Off 71
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