Operation
25 Liebert
®
NXL
™
2.13 Silence
This button will silence the audible alarm.
2.14 Modes of Operation
This section illustrates the flow of power through circuit breakers, switches and UPS components
during various modes of operation. The same modes of operation apply to all configurations of the
Liebert NXL. Highlighted (thick) lines in the diagrams indicate power flow and power availability.
These illustrations do not show an alternate power source (generator) and automatic transfer switch
(external to the UPS) that might be present at your installation.
2.14.1 Load on Bypass
Load on Bypass, with the UPS not available, is shown in Figure 29. The UPS system could be in this
mode of operation during either initial startup or UPS system shutdown and isolation for
maintenance.
NOTICE
Risk of equipment damage. When the critical load is being supplied power from the bypass
line, it is exposed to utility failure and fluctuations.
Figure 29 Load on bypass (UPS not available)
NOTE
The bypass modes of operation do not apply to N+1 multi-module systems.
Bypass
Input
DC Source
DC Bus
Module
Output
BFB
CB2CB1
MBD
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