Eaton 93PR - Using the Remote Emergency Power-Off Switch

Eaton 93PR 500 kW UPS
User's and Installation Guide 65
6.6. Using the Remote Emergency Power-off switch
A UPS emergency power-off is initiated by the EPO pushbutton switch. In an emergency, you can use this switch to
control the UPS output. The EPO switch de-energizes the critical load and powers down the UPS immediately, without
asking for verification. The UPS, including Bypass, remains off until restarted.
CAUTION
All power to the critical load is lost when the EPO switch is activated in the following step. You should use this feature only
when you want to de-energize the critical load.
NOTE
The following instructions are for the Eaton Corporation-supplied EPO switch. If a customersuppliedEPO switch is used, it
may not activate in the same manner; refer to the operating instructions provided with the switch.
To use the EPO switch:
1. Press the EPO pushbutton switch.
The input, output, and bypass backfeed relays open, the battery breaker or disconnect is tripped, and the power module
is turned off immediately, without asking for verification.
2. To restart the UPS after using the EPO pushbutton, reset the EPO switch and then follow the procedure in Chapter
6.3.1 Starting the UPS system in Double conversion mode or Chapter 6.3.2 Starting the UPS system in Bypass
mode.
DANGER
Do not attempt to restart the system after Load Off until the cause of the shutdown has been identified and cleared.