g
GE
OPM_SGS_ISG_M22_M30_0US_V011.doc
26/38
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 .3.8.3-2
).
Cable section for this connection
shall be not less then
AWG 1
.
Fig. 3.8.3-2 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.
Notices for installation
Q2
Q1
Q2
4
3
2
1
2
3
4
1
S
G
S
_225-300_UP
S
B
R
1-
2-3
_0
1
BR1
BR3
BR2
Fig. 3.8.3-3 AC bus bars BR1, BR2 and BR3
For separate
Bypass
and
Rectifier
input configuration AC bus bars
BR1
,
BR2
and
BR3
must
be removed
.
