Installation

Input Wiring (TB1)

To connect the input wiring, follow these steps:

1.Locate the input wiring access, remove the knockout and pull the three input wires through it, allowing some slack for installation.

2.Secure the conduit to the rear panel of the UPS.

3.Input Power cables connect to screw terminals on the Input Terminal Block located to the right of the Bypass Voltage Terminal. Connect the wires to the block connections as shown below. Using a torque wrench, turn the screws clockwise until tightened to the proper torque value (28 in-lb). Insert the ground wire through the grounding lug and tighten it to the proper torque value (120 in-lb).

Grounding Conductor Installation

An insulated grounding conductor must be identical or larger in size, insulation material, and thickness as the grounded and ungrounded branch circuit supply conductors. This cable must be green with or without one or more yellow stripes and is to be installed as part of the branch circuit that supplies the unit or system.

The grounding conductor is to be grounded to earth at the service equipment or, if supplied by a separately derived sys- tem, at the supply transformer or generator set.

Output Wiring (TB3)

Output wiring may be configured one of two different ways (240/120 or 208/120). Refer to the chart below and the diagram at right when configuring the output wiring.

Voltage

120

208

240

 

 

 

 

Between terminals

1 & 4

2 & 3

1 & 3

 

3 & 4

 

 

Use only the connections listed above. Other connections will produce nonstandard voltages.

NOTE

The Nfinity UPS contains an isolation transformer that generates a neutral conductor for the connected equipment. The UPS is a separately derived source and contains a neutral to ground bonding jumper. A grounding electrode conductor (GEC) must be installed in accordance with national and local wiring codes and regulations.

TB1

L1

L2

1

2

Note the Neutral / Earth jumper on the terminal above

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