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Introduction
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• Load Bus Synchronization—The Load Bus Sync (LBS) option keeps two independent UPS sys-
tems (and therefore their critical load buses) in sync, even when the modules are operating on bat-
teries or asynchronous AC sources. This means that critical loads connected to both load buses
can switch seamlessly between the two.
• Customer Alarm Interface—This optional interface board allows the input and display of eight
alarms from customer-supplied contacts, each with a customer-selected name of up to 19 charac-
ters. The following attributes can be programmed for each alarm: latching, audible, event log and
time delay (0 to 99.9 seconds).
• Temperature-Compensated Charging—When the battery temperature exceeds a preset limit
(typically 77°F [25°C]), this optional circuit proportionally reduces float charging voltage to pre-
vent overcharging the battery.
• Battery Load Testing—When activated, this option forces the battery string to assume the load
for a short period of time. The UPS then compares the test results to data collected during the
UPS commissioning to see if the battery system appears to meet specifications.
The Liebert NXL will display status events for Battery Equalize, Battery Self-Test and Battery Com-
missioning when those options are active.