Dell PowerEdge R320 User's Guide download pdf (Page 38)

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

rated at 350 W each. The combined continuous output power for all outputs has been designed

such that they will not exceed 650 W.

The DC output specification for the power supply is met by two power supply modules operating in

the power bay. A third power module may 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.

• If AC1 input fails or exceeds the specified voltage range, AC2 will transfer power to the two

modules located in the positions labeled PS2 and PS-Shared.

• If AC2 input fails, the AC transfer switch automatically switches from AC2 to AC1. As a

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.

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Dell PowerEdge R320 User's Guide Page 38