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Liebert NXL UPS
2.3 Modes of Operation
This section illustrates the flow of power through disconnectors, 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.
2.3.1
Load on Bypass
Load on Bypass, with the UPS not available, is shown in Figure 28. The UPS system could
be in this mode of operation during either initial start-up or UPS shutdown.
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 28 Load on bypass (UPS not available)
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Operation and Maintenance Manual
NOTICE
NOTICE
NOTICE
NOTICE
250-300-400-800kVA
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Active line
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