Critical Power
Modifications reserved
Page 63/146
GE_UPS_OPM_TLE_SCE_M60_M80_1GB_V020.docx
User Manual
TLE Series 600 & 800 CE S1
5.10
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).
5.10.1
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. 5.10.1-1 Power wiring of RPA Parallel System
1
= Rectifier
2
= Inverter
3
= Automatic Bypass
4
= Mains Input Distribution
5
= Unit Output Load
6
= External Battery MCB
7
= External Battery
8
=
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
