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Hot-swap Power Supplies
The power subsystem contains the power bay, with the AC transfer switch and the power
distribution logic, and locations for the three hot-swappable Thin Power Supply modules (TPS).
TPS positions are labeled AC1/PS1, AC2/PS2, and PS Shared. The power system is rated at 650
watts; the requirements of a fully-loaded system require that at least two operational TPS modules
(350 watts each) be installed at any one time. A fully redundant power configuration requires three
modules be installed, with the third module (PS Shared) acting as standby module in case one of the
first two modules fails.
When a failure occurs, the AC transfer switch will immediately fail over to the standby TPS
module in the PS-shared position. The failing TPS module can be removed and replaced without
powering down the server. After replacing the failed TPS module, the AC transfer switch will
engage the replaced module and set the module in the PS-Shared position back to standby.
NOTES
A system operating in a two TPS configuration should have a TPS filler
panel installed in the PS-Shared position to optimize cooling.
CAUTION
The system exceeds the 240 VAC energy hazard limits that define an
operator-accessible area. As a result, only qualified technical individuals
should access the processor, memory, and non-hot-swap areas while the
system is energized.
Determining Power Supply Status
Each TPS module has a bi-color LED that indicates the status and health of the module. Table 31
provides more detail on the LEDs.
Table 31. Power Supply LEDs
PWR
(Power)
Green LED
PFAIL
(Predictive Failure)
Amber LED
FAIL
(Power Supply Failure)
Amber LED
Description
Off
Off Off
No AC power to any power supplies
Off Off On
No AC power to a specific power
supply or power supply failure
Blinking Off Off
AC present / Standby output on
On Off Off
DC outputs on and okay
On Off Blinking
Current limit
On Blinking Off
Predictive failure
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