APC SRT5KRMXLI-6W User Manual download pdf (Page 25)

Smart-UPS On-Line SRT5K/6K Tower/Rack-Mount 3U/4U22

Emergency Power Off

Overview

The Emergency Power Off (EPO) option is a feature that will immediately disconnect all connected equipment from mains

power. The UPS will immediately shut down 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 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 mains 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 DAMAGE TO EQUIPMENT OR PERSONNEL

• Adhere to all national and local electrical codes.

• Wiring must be performed by a qualified electrician.

• Always connect the UPS to a grounded outlet.

Failure to follow these instructions can result in equipment damage and minor or moderate injury.

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APC SRT5KRMXLI-6W User Manual Page 25

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