Redundant Power System - Compaq DL590 - HP ProLiant - 1 GB RAM Technology Brief

TC020702TB
T B
ECHNOLOGY RIEF
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Redundant Power System

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The power subsystem in the ProLiant DL590/64 server is completely redundant. Redundant line
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cords allow customers to provide two AC feeds to the server from different power grids (see
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Figure 10). The line cords connect to a switch in the back of the server that senses when AC
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power from the primary feed is beginning to fail. It immediately switches to the redundant feed
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with absolutely no downtime to the server. As soon as the primary feed returns to its specified
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limits of operation, the server will automatically switch back to the primary source. Note,
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however, that the AC line redundancy feature functions only with use of high-line power.
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Figure 10: Dual AC feeds allow redundancy throughout the power subsystem.
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The ProLiant DL590/64 server also uses intelligent, redundant, hot-plug power supplies to reduce
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downtime. The server supports three dual-rated 1250-watt/700-watt primary power supplies
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(Figure 11) to deliver 48 volts DC power to the server. In addition, three corresponding system
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power modules (Figure 12) convert the 48-volt DC power to provide 3.3, 5, or 12 volts to the
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server's components.
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Figure 11: The ProLiant DL590/64 server supports three 1250-watt primary power supplies.
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