User Manual Liebert Hipulse E Chapter 7 - General Description
Single or '1+N' UPS System Design Concept
(07/04) Page 7-5
7.2.9 System Expansion
If necessary, a single-module system can be expanded to cater for an increased load requirement by adding additional
modules. Such forward planning should also take into account the physical space required by any additional UPS
modules, because any such modules must be situated adjacent to the existing system.
System expansion requires a change in the SETUP of the display panel.
Note: System expansion should be carried out only by trained service personal.
The individual modules connected to the system must be of the same power rating.
7.2.10 Frequency Converter
Liebert Hipulse E is designed to function with the output AC to your critical load, supplied at a different frequency to
the input mains.
The following frequency conversions are available:
1. 50 Hz input 60 Hz output
2. 60 Hz input 50 Hz output
When operating a single module as frequency converter the Liebert Hipulse E requires the static bypass operation to be
disabled and isolation of the input mains supply from your critical load. These modifications will be carried out by the
setting of internal links to inhibit the static switch operation, and isolation of the supply to the bypass isolator. As a
bypass is not required, it is easier to implement a frequency converter application by using a Multi Module Unit version
(MMU) Liebert Hipulse E module (see Figure 7-1). For requirements with different operating voltages the solution is to
use a standard MMU module with external adapter auto-transformer.
Figure 7-1 Example of frequency converter application
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