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OPM_SPE_XXX_60K_60K_7GB_V010.doc
Operatine Manual
SitePro 60 kVA
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.
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
10 =
Common busbar &
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
Fig. 4.9.1-1 Power wiring of RPA Parallel System
8
= UPS number 8
