APC SMX1000I User Manual download pdf (Page 15)

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 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.

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APC SMX1000I User Manual Page 15