UPS Operating Instructions
6-24 Eaton 93PM UPS (20–50 kW, 480V Four Wire – 50 kW Frame) Installation and Operation Manual P-164000540—Rev 4 www.eaton.com/powerquality
3. To restart the UPS after using the LOAD OFF follow the procedure in paragraph 6.3.1 or 6.3.2.
Power is present inside the UPS cabinet until the upstream input feeder circuit breakers and
battery breakers are opened.
6.3.16 Using the Remote Emergency Power-off Switch
Emergency Power Off (EPO) and Remote Emergency Power Off (REPO) functionality is disabled
for UPS systems configured for UL 924 auxiliary lighting. To remove power from the system a
LOAD OFF command (see paragraph 6.3.15) must be given using the front panel controls and all
breakers opened.
A UPS emergency power-off is initiated by the REPO pushbutton switch. In an emergency, you can use this
switch to control the UPS output. The REPO switch de-energizes the critical load and powers down the UPS
immediately, without asking for verification.
The UPS, including Bypass, remains off until restarted.
All power to the critical load is lost when the REPO switch is activated in the following step. You
should use this feature only when you want to de-energize the critical load.
To use the REPO switch:
1. Firmly push the red pushbutton until it locks into place. The switch latches into the activated state
(see Figure 6-23).
The rectifier, inverter, battery, and bypass switchgear open, and the power module is turned off
immediately, without asking for verification.
Do not attempt to restart the system after the REPO until the cause of the shutdown has been
identified and cleared.
2. To deactivate the REPO switch in preparation for restarting the UPS, insert the supplied key and rotate
clockwise until the red pushbutton releases (see Figure 6-23). To remove the key, rotate the key back to
the vertical position.
3. Restart the UPS by following the procedure in paragraph 6.3.1 or 6.3.2.
Power is present inside the UPS cabinet until the upstream input feeder circuit breakers and
battery breakers are opened.
NOTE The following instructions are for the Eaton-supplied REPO switch. If a
customer-supplied REPO switch is used, it may not activate in the same manner;
refer to the operating instructions provided with the switch.
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