GE 750 UL S2 User Manual

Also see for SG Series: Installation guide Datasheet Use and care manual Installation guide User manual

Modifications reserved Page 18/71OPM_SGS_USM_M75_M75_2US_V010.doc User Manual SG Series 750 UL S2 & SG Series 750 T12 UL S24.4 RECTIFIERS PARALLELED ON THE SAME BATTERYNOTE !A parallel system with a Common Battery for two or more Rectifiers, requiresa particular installation and adequate setting of some parameters,(accessible only through password), and can therefore only be done by aQUALIFIED SERVICE ENGINEER 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 - in SG Series 750 & SG Series750 T12 we already have two rectifiers in parallel - see Fig 4.4-1), the sharing circuit between individualRectifier is integrated in the communication bus of the system in order to assure an equal sharing of theRectifiers output currents.Fig. 4.4-1 Diagram RPA system with Rectifiers on Common Battery1 –2 –3 –4 –Utility inputExternal Battery FuseBatteryLoad Bus BarPay attention to the following recommendations:• The units delivered for this functioning mode needs a special parameters setting, so they must beprepared in advance before the installation.• The installation must be performed only with the UPS system completely shut down.• The AC Rectifiers input power (1) 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 recommended to install the fuses / MCCB (2) on each line connecting the Rectifiers to thecommon Battery for maintenance / safety reasons.• In case one must be powered down for maintenance, switch-OFF the concerned unit before openthe DC fuses / MCCB on the Battery line (2).• It is recommended to connect an external NO free contact “Battery Fuses” to the UPS and to enablethe 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 tothe 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 samemode 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).