American Power Conversion PDU - Manual (Page 18)

10 150kW 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 monitoring unit () (by way of the user connection plate), which connects to the internal EPO
switch of an APC UPS or other APC connected device ().
When the EPO is activated, 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 UPS inverters and batteries, and no
power to the InfraStruXure PDU.
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.