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Smart-UPS 750/1000/1500/2200/3000 VA 100/120/230 Vac / 500 VA 100 Vac Tower12
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.
Adhere to all national and local electrical codes. Wiring must be performed by a qualified electrician.
Connect each UPS to the EPO switch. In configurations where multiple units are connected in parallel, each UPS
must be connected to the EPO switch.
The UPS must be restarted for power to return to connected equipment. Press the
ON/OFF key on the front panel of
the UPS.
Adhere to all local and national electrical codes. All wiring must be performed by a qualified electrician.
Normally open contacts
1. If the EPO switch or relay contacts are normally open, insert the wires from the
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 closed, the UPS will turn OFF and power will be removed from the load.
Normally closed contacts
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 general use.
• CL2P: Plenum cable for use in ducts, plenums, and other spaces used for environmental air.
• CL2R: Riser cable 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 Canada: Use only CSA certified, type ELC, (extra-low voltage control cable).
• Installation in countries other than Canada and the USA: Use standard low voltage cable in accordance with
national and local regulations.
Note: The EPO function is available only for 2200/3000VA models.
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