The Steps Of Operation Of Maintenance Bypass; Figure 47 1+N System Shutdown - Emerson Liebert NXL series Operation And Maintenance Manual

Liebert NXL UPS
3) If press "1 N System" button and press Ok then shutdown all of the UPS and
load drop occur as shown in next figure.
2.7.8

The steps of operation of maintenance bypass

The maintenance bypass procedure transfers the load supply from being protected
by the UPS into AC input bypass supply through a maintenance bypass breaker.
This breaker is either:
Internal (Q3 located within UPS) for single module system (SMS) or 1+1
•
External (located in the SPC) for 1+1 capacity and 1+N redundant
•
With configurations consisting of two UPS's 1+1 capacity or 1+N redundant systems integrated
with more than two UPS's, where the load level is above the rated power of the single UPS, it is
necessary to install an adequate external maintenance bypass. It is also necessary to adopt all
the measures required to prevent the internal manual bypass breaker of the UPS (Q3) from
being used.
The steps of operation show in operation of SMS. The steps of operation of
maintenance bypass (the steps of operation for UPS shutdown).
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Operation and Maintenance Manual

Figure 47 1+N System Shutdown

redundant multimodule UPS applications.
multimodule UPS applications.
IMPORTANT
250-300-400-800kVA