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Installation Manual
Single or '1+N' UPS System
4.2
Installation procedure
4.2.1
Preliminary Checks
Be sure that a parallel kit is present and fitted in each of the modules, and that the modules are of the same rating and
with the same SW and HW release (See paragraph 8.1.2 of the User Manual The Menu Options).
Fitting of the parallel kits and board setting required to convert from Single Module to 1+N
4.2.2
Protective Devices
Refer to the instructions supplied in Chapter 2 Electrical Installation - Section 2.1.6.
4.2.3
Power cables
Input Bypass and Rectifier, outputs of modules
For power cabling the installation is the same for each module as described in Chapter 2.
4.2.4
Control cables
Inter-module control
Modules are interconnected as shown in Figure 4-2 using connections to the other UPS modules via the parallel
connector board with shielded 34-way cables.
These cables are connected between the 'N' modules to pass control signals which govern module synchronization, load
sharing, battery charge current sharing (in a common battery installation), load transfer operation and other general
control and alarm functions. These signals are necessary to ensure correct system operation, and built-in redundancy
allows the system to function if ever one of the 'N' cables becomes disconnected.
1+N Parallel UPS System: Inside the module there is a parallel connection board (P/N 4590060U) mounted on the
right hand side of the Static Switch cabinet. Connect one end of the interconnecting ribbon cable to interface connector
(X1) of the first UPS module and the other end to connector (X2) of the second module, and so to the next module until
a closed loop is formed.
Cable entry is as identified in the mechanical drawings in Chapter 6.
Liebert Hipulse E
WARNING
must be made by Liebert Service & Support trained personnel.
Inter-module Parallel Connections
Figure 4-2 Connection of '1+N' system parallel signal bus cables
(07/04)
Chapter 4 - '1+N' System
Page 4-3
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