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4.3.2 Connecting the Batteries
If the Liebert
®
NX
™
battery cabinets are installed on a raised floor, the battery power cables and
circuit breaker control cables may be routed to the UPS cabinet via the floor of the cabinet (bottom
entry).
If the Liebert NX battery cabinets are installed adjacent to one another on a solid floor, these cables
may be passed between the cabinets through lifting slots in the lower sides of the cabinets.
Intertray connections must be made before the battery cabinet can be used.
Figure 10 Battery cabinet—details
4.3.3 Installation Considerations
Position— If the system includes a matching maintenance bypass cabinet (MBC), the MBC should
be installed first and the battery cabinet installed on the opposite side of the UPS. Otherwise, left-
side placement of the battery cabinet is preferable.
The battery cabinet(s) are designed to be located conveniently next to each UPS module, and are also
available in stand-alone configurations with painted side panels. The front access design eliminates
side and rear service clearance requirements. Refer to Table 38 for battery cabinet dimensions and
weights.
Bolt-On Cabinets—Matching battery cabinets are designed to bolt onto the side of the UPS module
cabinet. Use bolts that ship with each unit to connect cabinet frames at posts, two places in the front
and two places in the rear.
Service Clearance—Allow front access to the battery cabinet at all times for maintenance and
servicing. Electrical codes require that the battery cabinet be installed with no less than 3 feet (1m) of
clearance at the front of the cabinet when operating. Side and rear panels do not require service
clearance.
Cables—Cables may be run between the cabinets through cutouts in the top of the cabinet,
eliminating the need for external conduit runs. Route cables before moving cabinets into final position
for bolting together. No top or bottom entry cables are required, except for remotely located cabinets
which require conduits.
Software—To allow the UPS to accurately display the battery run time, the number of battery
cabinets must be noted when performing initial startup and setup using the configuration software.
This is to be performed by the Liebert Services customer engineer when commissioning the unit.
Casters and Adjustable Stops—The adjustable stops are not designed to bear the full weight of the
cabinet. Lower the stops until they are finger-tight in contact with the floor. Then tighten a small
amount with a wrench (less than two turns) to give a good friction fit. When mounting the battery
cabinet on seismic stands, ensure that the casters are bearing the weight of the cabinet.
Battery Support Tray—Be sure to connect the battery tray support to the front of the cabinet
before sliding a battery tray out for connection or service. Without the support, the battery tray may
fall out of the cabinet. See Figure 11 for details.
Insulated Post
for Cabling
Tray Handle