26 Decanter program featuresBowl drive parameter settings:78.01 Decanter mode select = Bowl78.07 Bowl belt D1 = Value of D178.08 Bowl belt D2 = Value of D2Scroll drive parameter settings:78.01 Decanter mode select = Scroll78.04 Delta speed function = Backward drive78.07 Bowl belt D1 = Value of D178.08 Bowl belt D2 = Value of D278.09 Gearbox ratio = Gearbox ratio78.10 Scroll belt D3 = -1 x value of D378.11 Scroll belt D4 = Value of D4 Back drive, variant BFigure 8. Back drive, variant B decanter centrifugeIf Bowl motor is rotating in the forward direction, the Scroll motor must also be rotating inthe forward direction. This can be achieved by setting the below listed parameters inGroup 78 Decanter control. D1 and D2 are Bowl drives as represented in the above figure.GearboxD1D2BowlBowl motorScroll motorBack driveMain driveSupply networkDecanter centrifuge Scroll+-+-CommonDC link