ABB ACS850 Application Manual

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ABB ACS850 Application Manual Manual pdf 19 page image

19Supply unit selectionDC link power supplied via the driveThe DC link power can be supplied via a suitable drive module for the common DCsystem. The drive module will be selected based on Pmot,ave and Pmot,max requirements,and charging circuit capacity requirements. In frames E0, E and G the charging circuitof the connected module must be able to withstand the total charging energy E tot .Single AC input (frames A…D)In the optimum situation, only one drive module is connected to the AC supply and theother drive modules are supplied via DC link. The following conditions must be fulfilled:• Pmot,ave < Prec,ave• Pmot,max < Prec,maxIf the conditions cannot be fulfilled, either a drive module with higher Prec ratings can beselected (if feasible) or a multiple AC input configuration can be used.Single AC input frames E0…GTo determine whether it is possible to leave other converters unconnected to the mainsupply see chapter Checking the charging circuit capacity. The following conditionsmust also be fulfilled:• Pmot,ave < Prec,ave• Pmot,max < Prec,max• Etot < ErconnectedMultiple AC inputTo determine whether it is possible to leave some converters unconnected to the mainsupply see chapter Checking the charging circuit capacity.If two or more drive modules are connected to the AC supply, the same conditions asabove must still be fulfilled:• Pmot,ave < Prec,ave• Pmot,max < Prec,max• Etot < ErconnectedWhere Prec ratings are now calculated from the individual ratings as follows:• Prec,ave = Prec,ave1 + k(Prec,ave2 + Prec,ave3 +…. )• Prec,max = Prec,max1 + 0.9k(Prec,max2 + Prec,max3 +…. )Prec,ave1 and Prec,max1 are are the values of the drive module with the highest powerratings. It is recommended that the parallel connected units are the same size.Common DC configurations