USER MANUAL-S600E
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504402079908 S600E
Maintenance bypass
The UPS is equipped with a second bypass circuit, known as the maintenance bypass, which provides a safe working
environment for the engineers to carry out regular maintenance or repair the UPS system, while providing unregulated
mains supply to the loads. The maintenance bypass can be activated manually selected by closing the maintenance
bypass switch, and disconnected by setting the switch to OFF.
UPS Power Supply Switch Configuration
Figure 1-2 illustrates the block diagram of the UPS module. The UPShas inbuilt input isolation transformer. The
input supply connections of the bypass input switch (Q2) and rectifier input switch (Q1) are linked together so that
the bypass input and rectifier input use mains power from the same source.
During the normal UPS operation, all switches should be closed, with the exception of the maintenance bypass switch
Q3.
Figure 1-2 UPS power supply switch configuration
Battery Circuit Breaker (BCB)
The external battery shall be connected to the UPS via the BCB. The BCB box is an option that must be installed
close to the battery.
1.3
Parallel System
Up to four UPS modules may be parallel-connected to form a parallel system and increase the system capacity and
reliability. The load is shared equally between the parallel connected UPS modules.
Also, two UPS modules or parallel system may be used to form a dual bus system (LBS). Each UPS module or
parallel system has an independent output. Output synchronization is achieved through the LBS cable, thus
enabling seamless load transfer between the two systems.
If the UPS system consists of two or more UPS modules, and the load capacity exceeds the single module capacity, do not
use the internal maintenance bypass switch.
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