8 Parallel System and LBS System
This chapter gives details on the installation of the parallel system and LBS system.
8.1 General
The parallel system can comprise of up to four UPS units 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 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 ARN ING ! T o achieve coordinated operation of the modu les in the parallel system , it is
req uired to configure each module sep arately using Vertiv softw are setting. T his m ust be
don e b y Vertiv service personnel.
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
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® APM Plus User Manual
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