Specifications

10 InfraStruXure System—Installation and Start-Up
Emergency Power Off (EPO)
Overview
To provide a mechanism for emergency power off, attach a remote switch to the EPO interface on the
PDU monitoring unit through the user connection plate. The EPO interface (

) is connected to the
PDU Main Input switch (

) and to the UPS internal EPO switch (

).
When the EPO is activated, the main input breaker to the PDU transformer is opened, the UPS DC
Disconnect breaker is opened, and the UPS System Enable switch is turned off. In this sequence,
there is no power from the PDU transformer and there is no power from the UPS inverters and
batteries.
Note
APC offers an optional InfraStruXure EPO system (EPW9). Contact your APC sales
representative, or visit the APC Web site (www.apc.com) for more information.
See “Connect an Emergency Power Off Switch” on page 18 for instructions on how to
connect an EPO switch to the PDU.
PDU
Sw itch
UPS


