Figure 16 Options Diagram; Lbs Mode (Load Bus Synchronization) - Liebert NX series Operation & Maintenance Manual

10-30kva 208v, 60hz

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Table of Contents

4.2

LBS Mode (Load Bus Synchronization)

The function of LBS is to keep the output of two independent UPS systems (single unit or multiple

unit) in synchronization even when the two systems are operating in different modes (bypass/

inverter) or on batteries. It is usually used with an STS (Static Transfer Switch) connected to the crit-

ical load to achieve dual bus configuration.

CAUTION

In LBS configuration, both units must be supplied from the same utility source.

4.3

Battery Start (Optional)

With this option, the NX UPS can be started with power supplied only by the batteries (at charged

condition). This type of start, in the absence of utility power, allows independent utilization of battery

power and provides for higher availability in some circumstances.

CAUTION

Before attempting to start the UPS without utility power present, ensure that the batteries

are fully charged—over 2.1V per cell—and will supply adequate run time to the load.