Appendix A: Remote Emergency Power Of (Epo) - Unity I UT3K Manuel D'utilisation

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Appendix A : Remote Emergency Power Off (EPO)
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Computer rooms often have an emergency shutdown switch (sometimes referred to as a "panic button"). This switch
shuts off the power that runs the equipment in the computer room. If the UPS' AC input source is connected to the
switch, the switch will shut off the input power to the UPS. However, the UPS will interpret this as a power outage
and will continue to provide output power to the equipment it protects until its batteries run down. To make sure that
your emergency shutdown switch can shut off the UPS' output power, use the unit's remote Emergency Power Off
(EPO) feature.
Shut down the UPS (see Section 206) and disconnect AC power to the UPS before making connections to the
UPS' communication port.
• Your computer room's emergency shutdown switch must have a set of dedicated contacts that can short pin 7 to
pin 4 on the UNITY/I unit's communication port. Use a shielded, single twisted pair cable to connect the
emergency shutdown switch to the UPS communication port. See Figure 13.
• When the UPS' pin 7 is shorted to pin 4, the UPS' output power is shut off. When an EPO shutdown of the UPS
occurs, the UPS scrolls EPO on its four-digit display.
• To restart the UPS after an EPO shutdown, press the EPO Reset Button inside the front door of the UPS.
NOTE:
Figure 13
service and maintenance needs. Call the nearest Best Power office for more information.
The UPS cannot be restarted if the EPO signal is still asserted on pin 7.
CAUTION
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