EXPANSION CHASSIS
PCIe2-2712 PCI Express Gen2 Expansion System User’s Manual
6-7
Revision 1.0, February 2015
6.5.2
2180W/3240W Power Supply Options
The 5U chassis option is powered by an N+1 redundant supply providinig either 2180W or 3240W of
total power. Four individual power supply units reside across the bottom rear of the chassis and slide
into the redundant power supply housing. In this configuration, any one power supply module can fail
and the chassis will still provide full power capacity.
Should one power supply unit fail, an alarm will sound. The supplies are hotswappable; an individual
supply can be replaced while the unit remains powered on. Removing an individual supply is done by
loosening the thumb screw, then pushing outwards on the release tab while pulling the supply out of the
housing. Replacement power supply units are available from Cyclone.
The N+1 redundant supplies provide one 24-pin ATX power connector and two 8-pin EPS connectors
that power the PCIe2-429 backplane. Additionally, the supplies provide eight six-pin PCIe power
connectors, and eight six-plus-two pin PCIe power connectors for use with GPUs and other high-
powered PCIe cards. There are also provides six SerialATA connectors for powering disk drives and
other peripheral devices.
NOTE: Users should be aware that 2180W or 3240W systems may exceed the power available
from a standard 15A or 20A AC circuit. When connecting to the AC mains, care should be taken
to use multiple AC circuits. Otherwise, problems with tripping circuit breakers can result.
6.6
LIGHT LOADING
Because the power supply has been sized for a fully populated chassis, when placed under light loading,
the supply may not stay in regulation. Symptoms of a supply that is not regulating properly are loss of
link back to the host (“CABLE LINK” LEDs are not ON) or a chassis that powers up momentarily, then
turns OFF.
Users of the N+1 chassis or those using their own chassis and power supplies need to be aware of the
minimum loading requirements. The 1250W chassis minimum loading can be net by using the on-
board jumpers. The N+1 chassis will need to have cards installed to meet the +12V minimum loading.
Table 3-2 and Table 3-3 summarize the minimum loading requirements.
Table 6-8. 1250W Power Supply Minimum Loading
Voltage
Minimum Load
Status
+5VSB
0A
On board circuitry meets power supply minimum.
+5V
0A
On board circuitry meets power supply minimum.
+3.3V
0A
On board circuitry meets power supply minimum.
+12V
0.6A
On board circuitry meets power supply minimum.
