Mechanical Installation
3
1.0 MECHANICAL INSTALLATION
1.1 Introduction
This section describes the requirements that must be taken into account when planning the
positioning and cabling of the Liebert NXL uninterruptible power supply and related equipment.
This chapter is a guide to general procedures and practices that should be observed by the installing
personnel. The particular conditions of each site will determine the applicability of such procedures.
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 or IT-IG, or three-phase, three-wire plus ground IT-UG.
If the unit is used with an IT power system, a 4-pole disconnect device must be included as
part of building installation.
NOTICE
Do not apply electrical power to the UPS equipment before the arrival of the commissioning
engineer.
1.2 Preliminary Checks
Before installing the UPS, please carry out the following preliminary checks:
• Visually examine the UPS 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 interior doors reporting the type, size and main calibration parameters of the UPS.
• Verify that the UPS room satisfies the environmental conditions stipulated in the equipment
specification, paying particular attention to the ambient temperature and air exchange system.
1.3 Environmental Considerations
1.3.1 UPS Room
The UPS module 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 Environmental Parameters in Table 11).
The Liebert NXL UPS is cooled with the aid of internal fans. To permit air to enter and exit and
prevent overheating or malfunctioning, do not cover the ventilation openings.
The Liebert NXL UPS is equipped with air filters located behind the front doors. A schedule for
inspection of the air filters is required. The period between inspections will depend upon
environmental conditions.
When bottom entry is used, the conduit plate must be installed.
WARNING
Risk of electrical shock. Can cause injury or death.
Special care must be taken when working with the batteries associated with this equipment.
When they are connected together, the battery terminal voltage will exceed 400VDC and is
potentially lethal.
NOTE
All equipment not referred to in this manual is shipped with details of its own mechanical and
electrical installation.
NOTE
To ensure proper airflow, the unit must be installed only on a solid surface made of a
non-combustible material, such as concrete.
NOTE
The UPS is suitable for mounting on concrete or other non-combustible surface only.
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