GE 225 User Manual

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OPM_SGS_ISG_M22_M30_0US_V011.doc 

 Installation 

Guide 

SG Series 225 & 300 kVA 

 

To guarantee good Load sharing between the units of a parallel system, we recommend it is 
recommended that the cable length from the input distribution board (5) to the output 
distribution board (10) are the same length for each unit (a+b = c+d = e+f = g+h = i+l = m+n = 
o+p = q+r). Tolerance: +/-10%. 

 

The AC input power of the Bypass must be the same for all units of the parallel system - no 
phase shift allowed between units. 

 

 

It is strongly recommended that no transformers, automatic circuit breakers 
or fuses should be inserted between the unit’s output and the Load common 
bus bars. 
However, it is recommended that a disconnect or isolation switch be inserted 
in order to totally isolate a unit if needed 

 

Verify that power wiring and control wiring are run in separate conduits or cable trays. 
UPS input cables must be run in separate conduits from the output cables. 

 

 

 

1  = Rectifier 

 

c

 

=  Unit Number 1 

2  = Inverter 

 

2

 

=  Unit Number 2 

3  = Electronic 

Bypass 

 

3

 

=  Unit Number 3 

4  = Manual 

Bypass 

 

4

 

=  Unit Number 4 

5  = Input 

Utility 

Distribution 

 

5

 

=  Unit Number 5 

6  =  Unit Output Load  

 

6

 

=  Unit Number 6 

7  =  External Battery MCB 

 

7

 

=  Unit Number 7 

8  =  External Battery fuse 

 

8

 

=  Unit Number 8 

9  = External 

Battery 

 

 

 

10  =  Common Busbar and Output Load Distribution

 

 

 

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 and 3.8.3-2). 
Cable section for this connection shall be not less then AWG 1