Chapter 3 Parallel Ups Installation And Commissioning; Features; Requirements; Mechanical Installation - Liebert UHA1R-0100 User Manual

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Chapter 3 Parallel UPS Installation And Commissioning

Chapter 3 Parallel UPS Installation And Commissioning
The UPS parallel system provides the user with N + 1 (1 ≤ N ≤ 3) parallel configuration, N stands for the basic parallel
sets, 1 stands for the redundant sets.
The POD is compulsory for the UPS parallel system, it can provide safe and reliable power distribution function for
user. The UPS parallel system provides the user with 1 + 1 parallel POD and
3 + 1 parallel POD.
This chapter introduces the mechanical installation, setting parallel address, connecting parallel cables and POD
cables.

3.1 Features

1. The software and the hardware of each UPS in the parallel system are the same as those of the single UPS. The
detailed parameters can be set through the background software (for service engineers only). For all UPSs of the
parallel system, the requirements of the parameter settings are same.
2. The parallel cables form a ring connection to provide reliability and redundancy for the system.

3.2 Requirements

A UPS system composed of multiple parallel-connected UPSs is equivalent to a large UPS system. Nevertheless, it
provides increased system reliability. To ensure equal utilization of all UPSs and compliance with relevant wiring
regulations, the following requirements must be met:
1. All single UPSs must have the same capacity and must be connected to the same main and bypass source.
2. The bypass input power and the rectifier input power must be connected to the same input terminal.
3. The outputs of all single UPSs must be connected to the same output bus.

3.3 Mechanical Installation

Taking the rack installation of the 3 + 1 parallel system with battery modules for example, the mechanical installation
method of the parallel system is as follows:
1. The installation method of 3 + 1 parallel UPS is the same as that of the single UPS. Refer to 2.4 Mechanical
Installation for details.
2. As shown in Figure 3-1, to facilitate the cable connection and operation, the battery module should be installed at
the bottom; the UPS and the battery module should be installed in turn, and the POD should be installed on the top.
3. The installation method of the POD is the same as that of the UPS.
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