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Operation
15 Liebert
®
NX
™
2.4.1 Load on Bypass
In this operating mode, the connected loads are supplied from line power via the Static Bypass
Switch. The Static Bypass Switch is used to provide power to the loads. If an overload or short-circuit
on UPS output occurs, the Static Bypass Switch is automatically activated to provide uninterrupted
power to the loads. The Bypass operating condition is displayed. From this operating mode, the UPS
automatically reverts to on-line operation after the fault is corrected. Bypass operation can also be
specifically selected from the control panel using the push button.
Load on Bypass is shown in Figure 13. The UPS system could be in this mode of operation during
either initial startup or UPS system shutdown or isolation for maintenance.
NOTICE
Risk of unexpected power loss. Can cause equipment damage.
When the critical load is being supplied power from the bypass line, the load is vulnerable to
utility failure and fluctuations.
Figure 13 Load on bypass
Figure 14 Load on bypass, UPS available
Figure 15 Load on UPS, bypass available
DC
Bus
BFB
UPS Module
To DC Supply
Module Rectifier
AC Input
Module Bypass
AC Input
UPS Output
Critical
Load
DC
Bus
BFB
UPS Module
To DC Supply
Module Rectifier
AC Input
Module Bypass
AC Input
UPS Output
Critical
Load
BFB
UPS Module
To DC Supply
Module Rectifier
AC Input
Module Bypass
AC Input
UPS Output
Critical
Load
DC
Bus