Power, Thermal, Acoustic; Power Supply Subsystem; Power Distribution Board; Main Power Supply - Dell PowerEdge R715 Technical Manual

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4 Power, Thermal, Acoustic

The power supply subsystem supports up to two AC-DC power supplies (1+1 redundant configuration)

connected indirectly to the CPU planar through a Power Distribution Board (PDB). The power supply

only provides +12V and +12Vaux. There are several voltage regulators in the system to supply

different voltage levels needed by different logic devices.

4.1.1

The Power Distribution Board (PDB) distributes power from the Power Supply Unit (PSU) to the CPU

and IO planars. The Power Management bus enables power supply monitoring and load balancing. The

CPU planar connects directly to the PDB through a 32-pin and 6-blade connector. The IO planar

connects to the PDB through a 12-conductor (2x6) cable. The standby power is routed through the

CPU planar and IO planar via Air-max connector.

4.1.2

The base redundant system consists of two hot-plug 1100W or two hot-plug 750W power supplies in a

1+1 configuration.

FRU data is stored in the memory of the power supply microcontroller. Additionally, the power

supply firmware can be updated by the BMC over the PMBus.

Power is soft-switched, allowing you to cycle using a switch on the front of the system enclosure, or

by software control (through server management functions).

In a single power supply configuration, the power supply is installed in the PS1 location and a blank

module (metal cover) is installed in the PS2 location for factory consistency. Electrically, the system

can operate with a single power supply in either bay.

PowerEdge R715 Technical Guide

Figure 9.

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