88 Eaton 93PM Emergency Lighting UPS (50 kW, 480V Three and Four-Wire UL 924) Installation and Operation Manual P-164000569—Rev 03
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An UPS shutdown is initiated by the LOAD OFF command on the UPS Control screen. The UPS LOAD OFF
controls the UPS output by powering down the UPS and de-energizing the critical load.
The UPS (including Bypass) remains off until restarted.
To use the LOAD OFF command:
1. Tap the CONTROLS tab on the main menu navigation bar. The System Control screen is displayed.
CAUTION
All power to the critical load is lost when LOAD OFF is selected in the following step. You should use this
feature only when you want to de-energize the critical load.
2. Tap the LOAD OFF button.
An action confirmation screen is displayed. Follow the on screen prompts to shut down the UPS or to
cancel the shutdown. Selecting YES will immediately shut down the UPS and de-energize the critical load.
Selecting NO will abort the shutdown.
CAUTION
Do not attempt to restart the system after Load Off until the cause of the shutdown has been identified and
cleared.
3. To restart the UPS after using the LOAD OFF follow the procedure in paragraph
7.3.1 Starting the UPS in Double Conversion Mode or 7.3.2 Starting the UPS in Bypass Mode.
WARNING
Power is present inside the UPS cabinet until the upstream input feeder circuit breakers and battery breakers
are opened. Wait at least 5 minutes before accessing internal components.
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WARNING
• Emergency Power Off (EPO) and Remote Emergency Power Off (REPO) functionality has been disabled
for UL 924 emergency lighting systems. To remove power from the system a LOAD OFF command (see
paragraph 7.3.12 Using the UPS LOAD OFF Command) must be given using the front panel controls and all
breakers opened.
• Power is present inside the UPS cabinet until the upstream input feeder circuit breakers and battery
breakers are opened. Wait at least 5 minutes before accessing internal components.
UPS Operating Instructions
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