Power Distribution Units (Pdu/Pdru) - HP Surestore Disk Array 12h - And FC60 Service Manual

Power Distribution Units (PDU/PDRU)

PDUs provide a sufficient number of receptacles for a large number of devices installed in
a cabinet. A PDU connects to the site power source and distributes power to its ten
receptacles. The disk array power cords are connected to the PDUs and each PDU is
connected to a separate UPS. For high availability, two PDUs should be installed and
connected to separate site power sources.
PDUs come in a variety of heights, from five feet down to 19 inches. Because the 19-inch
PDU is shorter, it can be installed both vertically and horizontally. The peak power
requirements and PDU capacity affect the number of electrical devices that can be installed
in a rack. For example, to install more than four disk enclosures in an HP legacy rack, you
must upgrade from the older 3-foot and 5-foot PDUs to 19-inch PDUs.
In addition to rack density, consider the following in choosing PDUs:
•
Redundant power source. To connect redundant power supplies to separate PDUs,
install redundant PDUs.
•
Number of cords to the AC source. Using 30-amp PDRUs instead of 16-amp PDUs
reduces the number of cords to the wall.
•
Future needs. Installing surplus PDU capacity allows you to add devices later.
•
In-rush margins. For installations that require four or more 16-amp PDUs, HP
recommends HP 30-amp PDRUs (E7681A, E7682A) for their inherent in-rush protection.
•
On/Off switch support. Some PDU/PDRU options support the use of a single-point on/
off switch. See Table 12 and Table 13.
Power Distribution Units (PDU/PDRU)
117