Huawei UPS5000-A - Parallel System; Dual-Bus System

2.6.2 Parallel System
In a parallel system, mains input, bypass input, and AC output terminals of UPSs
are connected in parallel, separately. Energy control modules (ECMs) on dierent
UPSs are connected over parallel cables to synchronize UPS outputs to supply
power to loads. If one UPS fails, the other UPSs continue supplying power to
loads.
Figure 2-25 Conceptual diagram of an N+X parallel system
2.6.3 Dual-Bus System
A dual-bus system consists of two independent UPS systems. Each of these UPS
systems in turn consists of one or more UPSs connected in parallel. Of the two
UPS systems, one is a master system, and the other is a slave system. This design
makes the dual-bus system highly reliable and suitable for loads with multiple
input terminals. An optional static transfer switch (STS) can be installed to start
the bus synchronization controller (BSC). The UPS systems work in inverter mode
or bypass mode.
UPS5000-A-(30 kVA-120 kVA)
User Manual 2 Product Overview
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