Introduction | Emerson UPS Systems instruction

Single-Module Mechanical Installation

1.0SINGLE-MODULE MECHANICAL INSTALLATION

1.1Introduction

This section describes the requirements that must be taken into account when planning the position- ing and cabling of the Liebert NXL Maintenance Bypass Cabinet.

This chapter is a guide to general procedures and practices that should be observed by the installing engineer. The particular conditions of each site will determine the applicability of such procedures.

! WARNING

Do not apply electrical power to the UPS equipment before the arrival of the commissioning engineer.

! WARNING

The Maintenance Bypass Cabinet should be installed by a qualified engineer in accordance with the information contained in this chapter and all equipment not referred to this manual is shipped with details of its own mechanical and electrical installation.

! WARNING

Eye protection should be worn to prevent injury from accidental electrical arcs. Remove rings, watches and all metal objects. Only use tools with insulated handles. Wear rubber gloves.

NOTICE

Three-phase input supply required.

The standard Liebert NXL UPS is suitable for connection to three-phase, four-wire (+ Earth) TN-C, TN-S, IT-G, IT-IG or three-phase, three-wire plus ground, IT-UG.

If using the Liebert NXL UPS with an IT Power system, a four-pole disconnect device must be included as part of building installation.

1.2Preliminary Checks

Before installing the Maintenance Bypass Cabinet, carry out the following preliminary checks:

•Visually examine the equipment for transit damage, both internally and externally. Report any damage to the shipper immediately.

•Verify that the correct equipment is being installed. The equipment supplied has an identification tag on the back of the main door reporting: the type, size and main calibration parameters of the UPS.

•Verify that the room satisfies the environmental conditions stipulated in the equipment specifica- tions, paying particular attention to the ambient temperature and air exchange system.

1.3Environmental Considerations

1.3.1Room

The Maintenance Bypass Cabinet is intended for indoor installation and should be located in a cool, dry, clean-air environment with adequate ventilation to keep the ambient temperature within the specified operating range (see 3.0 - Specifications).

All models of the Liebert NXL Maintenance Bypass Cabinet are convection-cooled. To permit air to enter and exit and prevent overheating or malfunctioning, do not cover the ventilation openings.

When bottom entry is used, the conduit plate can be removed and punched and replaced. The bottom conduit plate must be replaced for proper airflow. If necessary to cool the room, install a system of room extractor fans.

NOTE

The Maintenance Bypass Cabinet is suitable for mounting on concrete or other non- combustible surface only.