HP RX8620-32 - Manual (Page 25)

Figure 19. Power inputs and interconnects in the Integrity rx7620-16 Server are designed for fault-tolerant power compliance
Fault-tolerant power compliance in the Integrity rx8620-32 Server
The AC input to the Integrity rx8620-32 Server is divided into four separate circuits. Each circuit is fed
by any 50 to 60 Hz high line source through four line cords. (“High line” refers to 200–240 volt
operation.) A minimum of two power cords is used to maintain normal operation of the Integrity
rx8620-32 Server. A second set of two cords is added to improve system availability by protecting,
for example, against power grid failures or accidentally tripped circuit breakers. Four power cords
are used in order to enable redundancy and hot-swap functionality of the bulk power supplies. This
power is routed from four individual 20-ampere circuit breakers via input line filters to six internal bulk
power supplies. These four lines are labeled A0, B0, A1, and B1 at the line filter inputs on the back
panel of the Integrity rx8620-32 Server.
Figure 20 shows the Integrity rx8620-32 Server power configuration. Note that each AC inlet feeds
three Integrity rx8620-32 Server bulk power supplies and that two separate AC inlets feed each bulk
supply. The design of the individual BPSs and the configuration of the interconnect meet all the
conditions for fault-tolerant power compliance.
Each BPS shown in Figure 20 can be thought of as two sub-power supplies housed in a single BPS
module. If only Grid A power cords are used, only one of the two sub-power supplies is in use. The
other supply is off until the Grid B cords are used. The benefit of this design is that when utilizing all
four power cords, the Integrity rx8620-32 Server has 2N+1 redundant power protection.
The dual AC modular power supplies provide:
• The ability to purchase only the amount of power conversion necessary for the intended Integrity
rx8620-32 Server configuration
• Redundancy for both hardware failures and power input failures
• Hot-plug capability for any BPS in a redundant configuration
• Better data security, maintenance scheduling, and maintenance operations without system
interruption
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