6.7 Using The Remote Emergency Power-Off Switch; Transfer Ups From Double Conversion Mode To Maintenance Bypass - Eaton 93PR Series User And Installation Manual

6.7 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.
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.
The following instructions are for the Eaton Corporation-supplied EPO switch. If a customersupplied
EPO switch is used, it may not activate in the same manner; refer to the operating instructions provided with the
switch.
Do not attempt to restart the system after Load Off until the cause of the shutdown has been identified and
cleared.
6.8 Transfer the UPS from double Conversion Mode to Maintenance Bypass Mode
The operation of the internal MBS is allowed for a trained person only who is familiar with the UPS behavior
and functions. The full UPS wiring diagram with a MBS switch is presented in the installation instructions.
The integral MBS and Static Bypass need to supplied by the same source.
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 6.4.1 Starting the UPS system in Double Conversion Mode or Chapter 6.4.2 Starting the UPS system
in Bypass Mode.
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CAUTION
NOTE
dANGER
NOTE
25-75 kW
User's and Installation Guide