Powerware UPS20-30kVA User Manual

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UPS 20-30 kVA, 230 V 0/60 Hz output  
User’s Guide
1026743 
Revision B
10. Parallel systems
Overview
Parallel UPS configurations are recognised as either redundancy or capacity systems. The 
redundancy system is used to improve the system reliability with N+1 redundant UPS module. 
The capacity system for its part provides the maximum output power without focusing to the 
highest system reliability. 
A parameter selection is used to switch between the redundancy and capacity modes. It is 
important to remember that the mode is affecting to the output power rating and overall system 
reliability. 
UPS modules of the parallel system share equally the load with Hot Sync™ technology. The 
parallel outputs can be combined in a System Parallel Module or cabinet. It is the system 
component containing the obligatory service switches. Customer’s low-voltage distribution 
panel can also be used instead of the System Parallel Module. In the redundancy system, 
service switches enable the maintenance or service on an UPS module. In the capacity system, 
one needs to have a common system bypass switch to do the maintenance or service without 
safety hazards.
Figure 19 Parallel configurations with UPS modules. 
Field upgrading can be used to extend existing capacity/redundancy systems with UPS 
modules. The upgrading must be carried out by service personnel from the manufacturer or 
from an agent authorised by the manufacturer.