PARALLEL SYSTEM AND LBS SYSTEM
60
User Manual 10H52246UM60 - Rev. 1 - 01/2017
Chapter 7
Parallel System and LBS System
This chapter provides information about installing parallel and LBS systems.
7.1
General
The parallel system may consist of up to four UPS modules of the same power rating, connected in parallel without
the need for a centralized mains static bypass. 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 load sharing, synchronization and bypass switching. The control
signals are connected via the multi-way, ribbon parallel cables connected between the units in the system to form a
ring.
When two or more modules are connected in parallel, we recommend installing the inductor on the static bypass line.
This can be installed inside the UPS as an option.
7.2
System Installation Procedures
The basic installation procedure for a parallel system consisting of two or more UPS modules is the same as for a
single module system. This section only covers the installation procedures that are specific to the parallel system.
To install a parallel UPS system, carry out the installation procedure for a single UPS module, with the additional
requirements described in this section.
7.2.1
Preliminary Checks
Make sure that the parallel cable options are correct, that the modules are the same rating and model, and that they
have the same software and hardware release.
Warning
In order achieve coordinated operation of the modules in the parallel system, it is necessary to configure each module
separately using the Vertiv configuration software. This must be done by Vertiv service personnel.
7.2.2
Cabinet Installation
Place the UPS modules side by side and interconnect them as shown in Figure 7-1. The output distribution mode
(Q1EXT, Q2EXT must be configured) shown in Figure 7-1 is recommended, in order to simplify maintenance and
system testing.
Other power supply
Mains input
L1,L2,L3,N
Fuse
Battery 1
Rectifier
Charger
Inverter
Static
switch
Q1
Q5&Q6
Q1EXT
QUPS
L1, L2,L3,N
To load
Q3
Output distribution
Q1
Q3
L1,L2,L3,N
Q2EXT
QBYP
Battery 2
Q2
Q5&Q6
Q2
External
Inverter
Fuse
Charger
Rectifier
Static
switch
Mains input
L1,L2,L3,N
bypass
switch
Extern
al
mai
n
te
nan
ce
b
ypass
Figure 7-1
Typical parallel system circuit diagram (with common input, separate batteries and output)
7.2.3
Power Cable
The power cable wiring is similar to that of the UPS module. Refer to
3.1 Power Cable Wiring
.