User's Manual

Smart-UPS 750/1000/1500/2200/3000 VA 120/230 Vac Tower / Rack-Mount 2U22
Emergency Power Off
Overview
The Emergency Power Off (EPO) option is a safety feature that will immediately shut off power to all connected
equipment. When the EPO button is pushed, all connected equipment will immediately turn off and will not switch
to battery power.
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 button on the front panel
of the UPS.
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 milliAmps 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.
CAUTION
RISK OF ELECTRIC SHOCK
• Adhere to all local and national electrical codes.
• Wiring should be performed by a qualified electrician.
• Always connect the UPS to a grounded outlet.
Failure to follow these instructions can result in minor or moderate injury.