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2.6
Mechanical Considerations
The Liebert NX is constructed with a steel frame and removable panels. Top and side panels are
secured to the chassis by screws. The doors may be opened for access to power connections bars,
auxiliary terminal blocks and power switches.
The UPS comes with an operator control panel, which provides basic operational status and alarm
information. Cooling is provided by internal fans. The unit sits on four casters. Adjustable stops are
provided to prevent the UPS from moving once it has been moved to its final position.
2.6.1
Clearances
There are no ventilation grilles on the sides or rear of the UPS. The unit may be placed with the rear
against a wall and optional cabinets on either side.
To enable routine tightening of power terminations within the UPS, make sure there is sufficient
clearance in front of the Liebert NX to permit free passage of personnel with the door fully opened.
Leave a minimum of 8 in. (203mm) between the top of the UPS and the ceiling to permit adequate air
circulation above the unit. Liebert recommends against using air conditioning or other systems that
blow air onto the top of the unit.
2.6.2
Floor Installation
The diagrams in 8.0 - Installation Drawings show the location of holes in the base plate for bolting
the equipment to the floor.
If the equipment is to be placed on a raised floor, it should be mounted on a pedestal that will support
the equipment point loading. Refer to the cabinet-bottom views in 8.0 - Installation Drawings to
design this pedestal.
2.6.3
Cable Entry
Cables can enter the Liebert NX from the top or bottom. Cable entry is made possible by removing a
metal plate attached to the UPS.
These plates are designed to allow the personnel to punch holes for fitting and securing the conduit.
Once the conduit holes are punched, these plates should be reattached to the UPS.
WARNING
!
Risk of explosion and fire. Can cause property damage, injury and death.
To reduce the risk of fire, connect only to a circuit provided with correct amperes maximum
branch circuit overcurrent protection (see Table 8) in accordance with the National Electric
Code, ANSI/NFPA 70.
NOTE
When installing the UPS, the customer must provide a disconnect with overcurrent protection
at the output of the UPS.
System Composition
A UPS system can comprise a number of equipment cabinets, depending on the individual system
design requirements—e.g., UPS cabinet with External Bypass cabinet and Maintenance Bypass
cabinet. In general, all cabinets used will be the same height and are designed to be positioned side-
by-side to form an aesthetically appealing equipment suite.
10
Installation
®
™
Liebert
NX
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