100 Chapter 7 Parallel System And LBS System
Liebert EXM 80kVA ~ 200kVA UPS User Manual
Chapter 7
Parallel System And LBS System
This chapter gives details on the installation of parallel system and LBS system.
7.1
General
The parallel system can comprise of up to four UPS modules of the same power rating and connected in
parallel without the need for a centralized mains static bypass. Instead the bypass static switches of each
UPS share the load when the system transfers to the mains bypass supply.
From a 'power' viewpoint, each module is internally identical to the 'single module' configuration. A parallel
system requires inter-module control signals to manage the load sharing, synchronizing and bypass
switching. The control signals are connected through the parallel cables, which are multi-way ribbon
cables connected between the units of the system to form a ring.
When two or more modules are to be connected in parallel, it is recommended that inductor should be
inserted in the static bypass line. This can be installed internal to the UPS as an option.
7.2
System Installation Procedures
The basic installation procedure of a parallel system comprising two or more UPS modules is the same as
that of single module system. This section only introduces the installation procedures specific to the
parallel system. The installation of a parallel UPS should follow the installation procedure for a single UPS
module with the additional requirements detailed in this section.
7.2.1
Preliminary Checks
Be sure that the options of the parallel cables are correct, and that the modules are of the same rating,
model, and with the same software and hardware release.
Warning
To achieve coordinated operation of the modules in the parallel system, it is required to configure each module
separately using Vertiv setting software. This must be done by Vertiv service personnel.
7.2.2
Cabinet Installation
Place the UPS modules side by side and interconnect as shown in Figure 7-1. The output distribution
mode (Q1EXT, Q2EXT must be configured) shown in Figure 7-1 is recommended to facilitate maintenance
and system testing.
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