Eaton 93PR Series - 4.5. Wiring of the UPS Parallel System

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4.4.1. Supported battery congurations
In the case of parallel use of 93PR UPS, both common battery and separate battery are
supported among the cabinets.
In terms of conguration of separate battery, each UPS is connected to the separate battery
cabinet. The battery settings among the cabinets are varied.
Common battery conguration currently only supports parallel connection of 2/3/4 cabinets.
Common battery conguration needs each cabinet to be connected to the same battery cabinet.
Multiple DC sources supported include lead-acid batteries, lithium batteries, nickel-cadmium
batteries, As for use of lithium batteries, the battery backup time and other battery parameters
are subject to the battery management system.
4.5. Wiring of the UPS Parallel System
The rated power of each UPS must be identical, and the rated power of each equipment’s static bypass
shall also be identical. If exceeding the specied quantity, please contact Eaton’s solution team for a
power distribution design.
The parallel system provides parallel connection or redundant function. This system can provide larger
capacity compared to a single UPS, and support exible congurations to meet customer needs. When
one UPS fails or is out of service due to maintenance, the remaining parallel-redundant UPS units will
continue to provide uninterruptible power to the critical load.
Among the UPS units there exist actual system monitoring and module control, as communication is
needed among the UPS units. The communication and control on the system level are realized by CAN
(Controller Area Network). The Pull-Chain signal of each UPS, as hardware redundancy, can carry out
synchronous control of bypass even if CAN communication is lost.
WARNING
Do not use the internal MBS (Manual Bypass Switch) of separate UPS in a parallel system
.
4.5.1. Overview of power cables
For the specications and installation methods of cable and external fuse, please see Section 3.2.2 Prepa-
ration for UPS Power Supply Wiring.
Rectier input
The rectier input is connected to the UPS as a power supply. The input of every UPS system must use a
common power source.
Bypass input
The input is connected to the bypass of the UPS. The bypass of every UPS system must use a common
power source. The shortest cable between each UPS and the power source shall be greater than 95% of