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HAPTER
System Power
Power Distribution Units
The standard oracle 42 unit (RU) rack uses pre-installed vertical power
distribution units (PDUs).
Vertical PDUs allow the 42 RU space in the rack to be used for installing system
components. PDUs are always used in pairs. Each power distribution unit (PDU)
must be attached to a dedicated facility circuit. Each Oracle FS System
component (Pilots, Controllers, and Drive Enclosures) must have its power
supplies connected to separate PDU circuits to ensure complete redundancy of
power.
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PDU Outlet Amperage Ratings
PDU Outlet Amperage Ratings
Plug in the Oracle FS System components (Pilots, Controllers, and Drive
Enclosures), into the PDUs so that they do not exceed the amperage rating of any
outlet group. Exceeding the amperage rating, can trip the circuit breakers.
The requirements of Underwriters Laboratories (UL) limit the power draw to
approximately 80% of the circuit breaker rating. For example: In the United
States where the voltage supply is at 240V, the power in a 30A circuit is 24A.
Thus the power available for use is 80% of the total amperage rating of the
circuit. The International Electrotechnical Commission (IEC) uses a system where
the exact available power is listed as the circuit breaker rating. For example: In
Europe, where the voltage supply is at 230V, the power in a 24A circuit is 24A.
For data centers with an input main power of 208V (single-phase from the
building), the amperes drawn increases by roughly 15% over a 240V service.
All PDUs have a remote monitoring capability that allows monitoring the current
consumption locally using an operator accessible meter and function switch or
remotely through a network connection. The monitor measures consumption on
each phase or inlet circuit attached to the PDU.
Note: The LED display on the PDU is powered by power input 0. The LED
display on the PDU might not power up if only one power input is used because
the PDU might use the connector on input 1.
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