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O O u u t t p p u u t t
The neutrals of all the UPSs must be connected. The shortest length of wire from the source to the UPS
must be a minimum of 95% of the length of the longest wire. The measurement is with respect to where
the UPS's outputs are tied.
D D u u a a l l s s o o u u r r c c e e
The input feed and bypass feed may be separate sources. The sources must share a common neutral.
B B a a t t t t e e r r y y c c o o n n n n e e c c t t i i o o n n
A separate battery shall be connected to each UPS, and the battery capacity for each UPS must be
identical.
M M O O B B s s
Module Output Breakers (MOBs) allow the output of a UPS to be disconnected from other UPSs and the
system load for maintenance and service. Design considerations assume that each UPS has a Module
Output Breaker (MOB). The breaker should also disconnect the neutral for improved safety during
maintenance.
The MOB must have a Form "C" auxiliary contact. The NO contact is connected to the corresponding
UPS's input used for signal input. The NC contact is used to disconnect the bypass pull-chain when the
MOB is open. Figure
Principle of paralleled UPS systems shows the principles of paralleled UPS
22:
systems including MOBs and outputs from UPSs.
M M o o b b o o v v e e r r r r i i d d e e
Users without MOBs installed can simply leave the MOB signal input disabled. The user should be aware
that systems without MOB have limited maintenance capability.
P P a a r r a a l l l l e e l l s s y y s s t t e e m m c c a a b b l l i i n n g g
Figure 22. Principle of paralleled UPS systems
5 5 6 6
EATON 93PM G2 UPS
USER'S AND INSTALLATION GUIDE
P-164000956 - February 2021
www.eaton.eu
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