GE AF-650 GP Design Manual page 26

The size of the Dead Band is defined by either P1 or P2 as shown in the graph below.
Thus a reference endpoint of P1 = (0 V, 0 RPM) will not result in any dead band, but a reference endpoint of e.g. P1 = (1V, 0 RPM) will result in a -1V to +1V dead
band in this case provided that the end point P2 is placed in either Quadrant 1 or Quadrant 4.
Case 1: Positive Reference with Dead band, Digital input to trigger reverse
This Case shows how Reference input with limits inside Min – Max limits clamps.
AF-650 GP Design Guide
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