User's Manual

Each PDM has eight AC receptacles and one thermal circuit breaker. The PDMs distribute the AC
power from the PDUs to the enclosures. Two power sources exist for each controller pair and drive
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 28 Rack PDM
2. Thermal circuit breakers1. Power receptacles
3. 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 29 (page 56)).
• PDMs 1 through 3 connect to receptacles A through D on PDU 1. Power cords connect these
PDMs to the number 1 drive enclosure power supplies and to the upper controller enclosure.
• PDMs 4 through 6 connect to receptacles A through D on PDU 2. Power cords connect these
PDMs to the number 2 drive enclosure power supplies and to the lower controller enclosure.
NOTE: The locations of the PDUs and the PDMs are the same in all racks.
Racks 55