13Smart-UPS X 750/1000/1500 VA 120/230 Vac Rack-Mount 2U
Emergency Power Off
Overview
The Emergency Power Off (EPO) option is a safety feature that will immediately disconnect all connected
equipment from utility power. The UPS will immediately shut down and will not switch to battery power.
Connect each UPS to the EPO switch, even if the UPS units are used in parallel.
The UPS must be restarted for power to return to connected equipment. Press the ON/OFF button on the front panel
of the UPS.
Adhere to all local and national el ec t ri ca l code s. All wiring must be performe d by a q ua l if i ed el ectrician.

Normally open contacts

1. If the EPO switch or relay contacts are normally open, insert the wires from th e
switch or contacts at pins 1 and 2 of the EPO terminal block. Use 16-28 AWG
wire.
2. Secure the wires by tightening the screws.
If the contacts are cl osed, the UPS will turn OFF and power will be removed from the load.

Normally closed contac ts

1. If the EPO switch or relay contacts are normally closed, insert the wires from
the switch or contacts at pins 2 and 3 of the EPO terminal block. Use 16-28
AWG wire.
2. Insert a wire jumper between pins 1 and 2. Secure the wires by tightening the
three screws at positions 1, 2, and 3.
If the contacts are opened, the UPS will turn OFF and power will be removed from the load.
Note: Pin 1 is the power source for the EPO circuit, it provides a few milliampere of 24 V power.
If the normally closed (NC) EPO configuration is used, the EPO switch or relay should be rated for “dry” circuit
applications, the rating should be for low voltage and low current applications. This normally implies the contacts
are gold-plated.
The EPO interface is a Safety Extra Low Voltage (SELV) circuit. Connect the EPO interface only to other SELV
circuits. The EPO interface monitors circuits that have no determined voltage potential. SELV circuits are
controlled by a switch or relay properly isolated from utility power. To avoid damage to the UPS, do not connect
the EPO interface to any circuit other than a SELV circuit.
Use one of the following cable types to connect the UPS to the EPO switch.
• CL2: Class 2 cable for genera l use.
• CL2P: Plenum cable for use in ducts , plenums, and other spaces used for environmental air.
• CL2R: Riser ca ble for use in a vertical run in a floor-to-floor shaft.
• CLEX: Limited use cable for use in dwellings and for use in raceways.
• Installation in Cana da: Use only CSA certified, type ELC, (extra-low voltage control cable).
• Installatio n in count rie s oth er than C anada and t he USA: Use standar d low-v olt age cable in accordanc e with
national and local regulations.
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