UPS5000-E-(25 kVA-75 kVA)-BF
User Manual
2 Overview
Issue 07 (2019-12-13)
Copyright © Huawei Technologies Co., Ltd.
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2.4.2 N+X Parallel System
In an N+X parallel system, the mains input, bypass input, and AC output terminals between
cabinets are connected in parallel. Energy control modules (ECMs) on each UPS are
connected over parallel cables. The parallel connections synchronize the UPS outputs to
supply power to loads. If one UPS fails, the other UPSs continue supplying power to loads.
shows a conceptual diagram of an N+X parallel system.
Figure 2-31
Conceptual diagram of an N+X parallel system
Each UPS supports a maximum of four battery cabinets connected in parallel.
uses each
UPS connecting to one battery cabinet as an example.
2.4.3 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. The UPS systems work in normal
mode or bypass mode.