UPS5000-E-(50 kVA-300 kVA)
User Manual (50 kVA Power Modules)
2 Overview
Issue 02 (2017-02-25)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
37
2.4.1 Single UPS
The UPS5000-E uses a modular design in which multiple power modules are connected in
parallel to deliver a high loading capacity. If a single power module is faulty, the other power
modules continue working. When the load power is small, even a single UPS can provide
redundant capacity, which ensures high reliability.
a single UPS.
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 2-24
Conceptual diagram of an N+X parallel system
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. An optional static transfer switch
(STS) can be installed to start the bus synchronization controller (BSC). The UPS systems
work in normal mode or bypass mode.
shows a conceptual diagram of a dual-bus
system.