What happens when PX1, PX2 and 250/500K PX is EPO'd

Symmetra PX

All models, all serial numbers

This document describes how the Symmetra PX reacts to the EPO circuit being activated. Emergency Power Off (EPO) is the capability to power down a piece of electronic equipment or an entire installation, in the case of an emergency, from a single point by activating a push button.

For 20K, 40K, 80K PX:

If the EPO circuit in the Symmetra PX is activated the System Enable Switch turns to the off position, the DC Breaker in the Main Frame or in the XR Frame (80kw units only) will trip. Mains feed CB will be tripped on ISX PDU. There is no power on the output of the XR Battery Frames or on the output of the Symmetra PX UPS.

An EPO event is not recorded in the Event Log.

For 100K PX:

Only the Battery CBs on XR frames will be tripped. Customer would need to have optional shut trip on Upstream CB to turn off input power to UPS.

For 250K/500K PX:

All Battery CBs on battery frames and Q2 will be tripped

Reset EPO switch and follow proper procedures to restart UPS