Eaton 93PR Installation And Operation Manual page 85

A separate battery shall be connected to each UPS, and the battery capacity for each UPS must
be identical. A common battery for all UPSs is not supported.
Parallel system wiring
• Parallel system combined input and output cable length should be in accordance with
the following rule. It should be designed to ensure that wiring impedance from point
of supply to UPS input and from UPS output to 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 static bypass mode and
restrain input/output high frequency loop current of parallel system. Suggest that
parallel system combined input and output cable length no less than 10m, 5m for
input and 5m for output.
Total length of 1A =2A=3A=4A
• If 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.
• Ensure that each UPS static bypass is fed from a single common source, as is an
external bypass switch if installed. If each UPS is fed with a separate rectifier source,
please consult Eaton for advice on compatibility.
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CAUTION
1B=2B=3B=4B
1C=2C=3C=4C
Eaton 93PR 60-1200 kW UPS
Installation and Operation Manual
73