Modifications reserved Page 18/79
OPM_SGS_USM_M22_M30_2US_V010.doc User Manual SG Series 225 & 300 UL S2
4.4 RECTIFIERS PARALLELED ON THE SAME BATTERY
NOTE !
A parallel system with a Common Battery for two or more Rectifiers, requires a
particular installation and adequate setting of some parameters, (accessible only
through password), and can therefore only be done by a QUALIFIED ENGINEER from GE.
Usually each Rectifier-Inverter Unit runs with its own Battery.
In case of parallel units are running with a Common Battery (max. 4 UPS - see Fig 4.4-1), the sharing
circuit between individual Rectifier 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
Utility 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 clockwise 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 / MCCB (7) on each line connecting the Rectifiers to the common
Battery for maintenance / safety reasons.
• In case one must be powered down for maintenance, switch-OFF the concerned unit before open
the DC fuses / MCCB on the Battery line (7).
• It is mandatory to connect an external NO free contact “Battery Fuses” to the UPS and to enable the
function by setting the parameter (see Section 4.1 of the “Installation Guide”).
• 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 for automatic battery floating voltage compensation.
• Do not enable the function Boost charge (parameter 87).
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