Xtreme Power Conversion Corporation
R91 User’s Manual
Page 14
Uninterruptible Power Supply
Remote Emergency Power Off (EPO) for Parallel Systems
EPO for parallel systems must be connected in parallel and installed as shown below. Once the EPO function of one
of the UPS in the parallel system is activated, the UPS will send out a remote command and shut down the other
UPS’s in the parallel system.
CAUTION!
The remote emergency kill switch must be voltage-free and “normally open”.
EPO connections for parallel systems
Requirements for a Parallel System
A group of parallel UPS modules behave as one large UPS system with the advantage of presenting higher reli-
ability. In order to assure that all modules are equally utilized and comply with relevant wiring regulations, please
follow the requirements below.
1.
All UPS modules must be of the same rating and be connected to the same bypass source.
2.
The Bypass and Utility input sources must be referenced to the same neutral potential.
3.
The outputs of all the UPS modules must be connected to a common output bus.
