GE 225 Installation Manual page 26

g
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:
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.
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
For separate Bypass and Rectifier input configuration AC bus bars BR1, BR2 and BR3 must
be removed.
OPM_SGS_ISG_M22_M30_0US_V011.doc
With this configuration, load can only be connected phase-
phase. Absolutely no load connection permitted to the
Neutral of the output transformer.
Q1
Q2
1
2
3 1
4 2
3
4
Fig. 3.8.3-3 AC bus bars BR1, BR2 and BR3
26/38
Fig. 3.8.3-2 3-wire kit for RPA Parallel System
Q2
BR1
BR2
BR3
Installation Guide SG Series 225 & 300 kVA
GE