Danfoss VLT AutomationDrive FC 300 Design Manual page 29

FC 300 Design Guide 3. Introduction to FC 300
3
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.
Case 2: Positive Reference with Dead band, Digital input to trigger reverse. Clamping
rules.
This Case shows how Reference input with limits outside -Max – +Max limits clamps to the inputs
low and high limits before addition to External reference. And how the External reference is clam-
ped to -Max – +Max by the Reference algorithm.
29
MG.33.B9.02 - VLT ® is a registered Danfoss trademark