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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
SGS_225-300_UPS BR1-2-3_01
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
.