3.5 Installation and Commissioning for a Dual Bus System (for 20kVA system only)
3.5.1 Introduction
The dual bus system consists of two independent UPS systems; each UPS system consists of one or two
parallel-connected single UPSs, or more parallel-connected single UPSs.
The dual bus system has high reliability, which is suitable for the load with many input terminals. For single UPS input
load, you can add a static trigger switch (STS, optional) to start the standard Load Bus Synchronization (LBS) system.
Place the UPSs side by side, and connect the UPSs as follows:
The dual bus system adopts the LBS system to realize the output synchronization of the two independent (or parallel)
UPS systems. One is the master system, and the other is the slave system. The operation mode of the dual bus system
contains master system and/or slave system running in Normal mode or Bypass mode. The schematic diagram of the
LBS system built by two UPSs is shown in Figure 3-6.
Figure 3-6 LBS System Schematic Diagram
3.5.2 Connecting LBS Cable
The appearance of the LBS port is the same as the parallel port. For the dual bus system formed by the parallel UPS, it
is recommended to prepare two LBS cables used to connect any two parallel/LBS ports of the two-parallel system,
which is used for reliable connection.LBS connection is applicable for only 20kVA.
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