8.4 LBS System
8.4.1 Cabinet Installation
An LBS system consists of two independent UPS systems, each containing one or more parallel UPS modules, as shown in
Figure 8.5 below and Figure 8.6 on the facing page The LBS system has high reliability and is applicable to the load with
multiple inputs. For single-input load, an STS can be installed to feed power to the load.
The system uses the LBS cables to keep the output of two independent UPS systems in synchronization. One set of UPS
system (single/parallel) is designated as the master, the other set of UPS system (single/parallel) is designated as the slave
for the operation in LBS mode.
Figure 8.5 LBS system (UPS m od ule)
N O. D esc rip tio n NO. D esc rip tio n
1 Bypass 5 Q3
2 Rectifier 6 Q5
3 Q1 7 To load
4 Q2
N O T E: Q 1, Q 2 and Q 5 are optional while Q 3 is stand ard.
8 Parallel System and LBS System
148
Vertiv™ Liebert® EXM2 UPS User Manual
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