GE Digital Energy SG Series Installation Manual

Also see for Digital Energy SG Series: Operating manual Installation guide

Contents

g GEOPM_SGS_ISG_10K_40K_0US_V010.doc 36/45 Installation Guide SG Series 10, 20, 30 & 40 kVA3.9 POWER WIRING OF PARALLEL UNITSTo guarantee good load sharing between the units of a parallel system, we recommend it isrecommended that the cable length from the input distribution board (5) to the outputdistribution board (10) are the same length 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 - nophase shift allowed between units.It is strongly recommended that no transformers, automatic circuit breakersor fuses should be inserted between the unit’s output and the load commonbus bars.However, it is recommended that a disconnect or isolation switch be insertedin order to totally isolate a unit if neededVerify that power wiring and control wiring are run in separate conduits or cable trays.UPS input cables must be run in separate conduits from the output cables.Fig. 3.9-1 RPA Parallel System1 = Rectifier = Unit Number 12 = Inverter 2 = Unit Number 23 = Electronic Bypass 3 = Unit Number 34 = Manual Bypass 4 = Unit Number 45 = Input Utility Distribution 5 = Unit Number 56 = Unit Output Load 6 = Unit Number 67 = External Battery MCB 7 = Unit Number 78 = External Battery fuse 8 = Unit Number 89 = External Battery10 = Common Busbar and Output Load Distribution