ABB ACS880 Series, Supplement Manual

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26 Decanter program features
Bowl drive parameter settings:
78.01 Decanter mode select = Bowl
78.07 Bowl belt D1 = Value of D1
78.08 Bowl belt D2 = Value of D2
Scroll drive parameter settings:
78.01 Decanter mode select = Scroll
78.04 Delta speed function = Backward drive
78.07 Bowl belt D1 = Value of D1
78.08 Bowl belt D2 = Value of D2
78.09 Gearbox ratio = Gearbox ratio
78.10 Scroll belt D3 = -1 x value of D3
78.11 Scroll belt D4 = Value of D4

Back drive, variant B
Figure 8. Back drive, variant B decanter centrifuge
If Bowl motor is rotating in the forward direction, the Scroll motor must also be rotating in
the forward direction. This can be achieved by setting the below listed parameters in
Group
78 Decanter control . D1 and D2 are Bowl drives as represented in the above figure.
Gearbox
D1
D2
Bowl
Bowl motor
Scroll motor
Back drive
Main drive
Supply network
Decanter centrifuge
Scroll
+
-
+
-
Common
DC link