Modifications reserved
Page 18/99
OPM_SPE_XXX_10K_40K_8GB_V020.doc
Operating Manual
SitePro 10-15-20-30-40 kVA / S8
4.4 RECTIFIERS PARALLELED ON THE SAME BATTERY
NOTE !
A
Parallel System
with a
Common Battery
for two or more
UPS
, requires a
particular installation and adequate setting of some parameters, (accessible
only through password), and can therefore only be done by a qualified GE
engineer.
Usually each
UPS Unit
runs with its own
Battery
.
In case of parallel units running with a
Common Battery
(max. 4 UPS - see
Fig. 4.4-1
), the sharing circuit
between the individual
UPS
is integrated in the communication bus of the system in order to assure an
equal sharing of the
Rectifiers
output currents.
Fig. 4.4-1 Diagram RPA system with rectifiers on common battery
1 –
2 –
3 –
4 –
5 –
6 –
7 –
8 –
Rectifier
Inverter
Automatic Bypass
Manual Bypass
Mains power
Load bus bar
External battery fuse
Battery
Pay attention to the following recommendations:
•
The units delivered for this functioning mode needs a special parameters setting, so they must be
prepared in advance before the installation.
•
The installation must be performed only with the UPS system must be completely shut down.
•
The AC rectifiers input power (5) must be the same, with the right phase rotation for each unit.
•
Each rectifier must be set for the same floating DC voltage and the same battery current limitation.
•
It is mandatory to install the
fuses / MCB
(7) on each line connecting the rectifiers to the common
battery for maintenance / safety reasons (for fuses rating see
Section 5.7.2
).
•
In case one must be powered down for maintenance, switch-OFF the concerned unit before open
the
DC fuses/MCB
on the battery line (7).
•
It is recommended to connect an external NO free contact “battery fuses” to the UPS and to enable
the function by setting the parameter (see
Section 9.1
).
•
If an emergency generator set supply the UPS, and the free contact
“Generator ON”
is connected to
the Customer interface, connect a separate NO free contact on each parallel unit.
•
The parameters enabling the battery test, both manual and automatic, must be set in the same
mode on all the units having the rectifiers on common battery.
•
Do not connect the temperature sensor (standard delivery on
SitePro 10 – 60 kVA
) for automatic
battery floating voltage compensation.
•
Do not enable the function
Boost charge
(parameter 87).
