Eaton 93E UPS 15-80 kVA (380/400/415 V) Installation and Operation Manual
© Eaton Corporation plc 2015. All rights reserved. Revision: 001
Document ID: 614-01975-00
65 (133)
CAUTION
In a parallel system, the combined input and output cable length
should be in accordance with the following rule. It should be designed
to ensure that wiring impedance from the point of supply to the UPS
input and from the UPS output to the load connection for each UPS
module in a multi-module system is equal, or within a tolerance of
approximately ±10%. This is to ensure approximately equal current
sharing when in the static bypass mode and to restrain input/output
high frequency loop current of a parallel system.
Total length: 1A + 1B = 2A + 2B = 3A + 3B = 4A + 4B
If you are installing only two UPS modules (redundant), this
requirement is no longer required, as each UPS is capable of
supporting the full bypass requirement. However, this would preclude
future expansion.
Make sure that each UPS static bypass and the external bypass switch
(if installed) is fed from a single common source. If each UPS is fed
with a separate rectifier source, consult Eaton for advice on
compatibility.
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