Each PDM has seven AC receptacles. The PDMs distribute the AC power from the PDUs to the
enclosures. Two power sources exist for each controller pair and disk enclosure. If a PDU fails, the
system will remain operational.
CAUTION: The AC power distribution within a rack ensures a balanced load to each PDU and
reduces the possibility of an overload condition. Changing the cabling to or from a PDM could
cause an overload condition. HP supports only the AC power distributions defined in this user
guide.
Figure 18 Rack PDM
1. Power receptacles
2. AC power connector
Rack AC power distribution
The power distribution in an Enterprise Virtual Array rack is the same for all variants. The site AC
input voltage is routed to the dual PDU assembly mounted in the rack lower rear. Each PDU
distributes AC to a maximum of four PDMs mounted on the left and right vertical rails (see
Figure 19 (page 24)).
• PDMs A1 through A4 connect to receptacles A through D on PDU A. Power cords connect
these PDMs to the left power supplies on the disk enclosures and to the left power supplies on
the controllers.
• PDMs B1 through B4 connect to receptacles A through D on PDU B. Power cords connect
these PDMs to the right power supplies on the disk enclosures and to the right power supplies
on the controllers.
Power distribution–Modular PDUs 23
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