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).
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