Dual source
The input feed and bypass feed may be separate sources. The sources must
share a common neutral.
Battery connection
A separate battery shall be connected to each UPS, and the battery capacity for
each UPS must be identical. If a common battery for multiple UPS frames is
needed, contact Eaton Technical Support.
MOBs
Module Output Breakers (MOBs) allow the output of an 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 N.C contact is connected
to the corresponding UPS’s input used for signal input. The N.O. contact is used
to disconnect the bypass pull-chain when the MOB is open. Figure 22: Principle
of paralleled UPS systems shows the principles of paralleled UPS systems
including MOBs and outputs from UPSs.
MOB override
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.
© Eaton Corporation plc 2020. All rights reserved. Revision: 006 Document ID: P-164000493 71 (126)
Eaton 91PS/93PS UPS 8–40 kW User’s and Installation Guide
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