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4.9
RPA PARALLEL SYSTEM CONNECTION
WARNING !
This operation must be performed by trained personnel before the initial start-up
(ensure that the UPS installation is completely powered down).
4.9.1 Power wiring of parallel units
To guarantee good Load sharing between the units of a Parallel System, we recommend that the cable
length from the input distribution board (5) to the output distribution board (9) is equal 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.
NOTE !
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 disconnection or isolation switch is installed in
order to totally isolate a unit if needed.
Verify that power wiring and control wiring run in separate conduits or cable trays.
The power wiring requires two separate conduits: one for input and one for output cables.
Fig. 4.9.1-1 Power wiring of RPA Parallel System
Modifications reserved
GE_UPS_ISG_TLE_SUL_40K_M15_1US_V010.docx
Critical Power
1
2
3
4
5
6
7
8
= Rectifier
= Inverter
= Automatic Bypass
= Input Utility Distribution
= Unit Output Load
= External Battery MCB
= External Battery
Common bus bar and
=
Output Load Distribution
= UPS number 1
= UPS number 2
= UPS number 3
= UPS number 4
= UPS number 5
= UPS number 6
Installation Guide TLE Scalable Series 40 - 150 UL S1
Page 39/53
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