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Installation
Guide
SG Series
225 & 300 kVA
This UPS is only designed to operate in a wye-configured electrical
system with a solidly grounded neutral.
In case of 3-wire utility input the following solutions are possible:
1- Connection of a
“3-wire kit”
between
Utility Input
and
Neutral
of the
output transformer.
Attention: With this configuration, load can only be connected
phase-phase.
Absolutely no load connection permitted to the Neutral of
the output transformer.
In a
RPA configuration
with 3-wire
kit, it’s most important to connect
the Neutrals of the UPS outputs
together (see
Fig .3.8.2-2
).
Cable section for this connection
shall be not less then
AWG 1
.
Fig. 3.8.2-2 3-wire kit for RPA Parallel System
2- Bypass
transformer.
In this case the
Neutral
of wye secondary winding must be connected
to the
Neutral
of the output transformer.
Contact your
Service Centre
, which will help you to find valuable solutions.
