8 Parallel System and LBS System
This chapter gives details on the installation of parallel system and LBS system.
8.1 General
The parallel system can comprise of up to six 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.
8.2 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.
8.2.1 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.
W A RN IN G! To achieve coordinated operation of the m odules in the parallel system , it is
required to config u re each m odule separately using Vertiv setting softw are. This m ust be
done by Vertiv service person n el.
8.2.2 Cabinet Installation
Place the UPS modules side by side and interconnect as shown in Figure 8.1 on the next page. The output distribution mode
(Q1EXT, Q2EXT must be configured) shown in Figure 8.1 on the next page is recommended to facilitate maintenance and
system testing.
8 Parallel System and LBS System
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Vertiv™ Liebert® EXM2 UPS User Manual
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