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Battery Installation

3.5

Battery Protection

3.5.1 Battery Undervoltage Pre-Warning

Before the end of discharge, the NX displays a battery undervoltage pre-warning. After this pre-warn-

ing, the battery has the capacity for 5 minutes discharging with full load (default time). The NX can

be user-configured to display this warning from 3 to 60 minutes before end-of-discharge.

3.5.2 Battery End-of-Discharge (EOD) Protection

If the battery voltage is lower than the end-of-discharge voltage, the battery converter will be shut

down.

3.5.3 Battery Fuse-Blow Warning

Battery current protection is provided by the battery fuses FU7 and FU8. If a battery fuse blows, the

NX displays the battery fuse-blow warning and the battery converter will be shut down.

3.6

External Battery Cabinet Installation

The following notes, in conjunction with the diagrams (

Figure 10

through

), illustrate the broad

principles to be followed when fitting and connecting the majority of battery cabinet installations.
When installing an external battery cabinet, the customer must provide overcurrent protection. See

Table 20

for sizing of protection devices.

3.6.1 Fitting the Batteries

1. Leave at least 3/8 in. (10mm) on all vertical sides of the battery to permit free air circulation

around the batteries.

2. Allow adequate clearance between the top of the batteries and the underside of the shelf above for

monitoring and servicing the batteries.

3. When installing the batteries, always work from the bottom shelf up to prevent raising the center

of gravity, which could cause a tip-over hazard.

3.6.2 Connecting the Batteries

If the 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 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.
Liebert recommends connecting the batteries in the following sequence:
1. Connect cables between batteries on each individual tray.
2. Attach cables connecting the battery trays
3. Connect the cables to the circuit breaker.
An insulating shroud should be fitted to each terminal after its connection has been made.
When connecting the cables between the batteries to the circuit breaker, always connect the circuit

breaker end of the cable first.

NOTE

All equipment servicing procedures must be carried out only by trained personnel.

NOTE

When using an external battery supply that is not provided with the UPS, please make

reference to the battery manufacturer’s installation manual for battery installation and

maintenance instructions, available on the manufacturer’s Web site. When replacing batteries,

Liebert recommends that the batteries in external cabinets be the same type used internally in

the NX. See

Table 10

for a list of batteries that are approved for use with this product.

NOTE