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16 NovaScale 4020 User’s Guide
Power Subsystem
Power Supply Modules
The power supply modules are Server System Infrastructure (SSI) compliant, universal AC
input with Power Factor Correction (PFC) Thin Power Supplies (TPS). The power supply
modules are auto-sens over the input range of 200-240 VAC and 100-127 VAC. They are rated
at 350 W each. The combined continuous output power for all outputs has been designed such
that they will not exceed 650W.
The DC output specification for the power supply is met by two power supply modules
operating in the power bay. A third power module can be inserted to enable redundancy. When
operated in parallel, the power modules share the total load currents equally within the limits
specified, and meet all performance requirements. Two power supply modules are capable of
handling the worst-case power requirements for a fully configured system: Two processors, 16
GB of memory, three PCI-X add-in cards, two hard drives and a DVD or CD drive.
In the unlikely event that a power module fails in a redundantly paralleled group, or upon the
removal of an operational or failed supply from a redundantly paralleled group, the action will
not cause DC output transients in excess of specified limits. Conversely, adding an operational
or failed supply to a paralleled group will not cause DC output transients in excess of the limits
specified.
Redundant AC Power Source Operation
The power bay has two AC inlets, labeled AC1 and AC2, located at the rear of the chassis.
AC1 is connected to the inputs of power supply module PS1. AC2 is connected to module PS2
and the redundant power module PS-Shared, through normally closed transfer switch contacts.
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If AC1 input fails or exceeds the specified voltage range, AC2 will transfer power to the
two modules located in the positions labled PS2 and PS-Shared.
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If AC2 input fails, the AC transfer switch automatically switches from AC2 to AC1. As
result, AC1 connects to the two power supply modules located in locations PS1 and PS-
Shared. After AC2 recovers, the AC transfer switch resets to its original state. This feature
allows the system to be powered by two separate AC sources. In this configuration, the
system continues to operate without interruption if one of the AC sources fails.
Processor Power Pods
Dedicated power pods supply power to each processor. The input connector of the power pod
is connected to the 12 VDC power on the main board via a short ‘Y’ cable. The output
connector of the power pod mates directly with the edge of the processor package.