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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 (10) 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
OPM_SPE_XXX_60K_60K_7GB_V010.doc
1
= Rectifier
2
= Inverter
3
= Automatic Bypass
4
= Manual Bypass
5
= Input mains distribution
6
= Unit output load
7
= External battery MCB
8
= External battery fuse
9
= External battery
Common busbar &
10
=
Output load distribution
= UPS number 1
2
= UPS number 2
3
= UPS number 3
4
= UPS number 4
5
= UPS number 5
6
= UPS number 6
7
= UPS number 7
8
= UPS number 8
Operatine Manual SitePro 60 kVA
Pagina 31/90
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