Delta C2000 Series User Manual page 342

The 3 parameters (Pr03-69, Pr03-71 and Pr03-73) must meet the following argument: P03-69 <
P03-71 < P03-73. The 3 proportional points (Pr03-70, Pr03-72 and Pr03-74) doesn't have any
limit. Between two points is a linear calculation
The output % will become 0% when the negative AUI input value is lower than low point setting.
For example:
P03-63=-1V; P03-64 = 10%. The output will become 0% when AUI input is bigger than -1V. If the
AUI input is swing between -1V and -1.1V, drive's output frequency will beats between 0% and
10%.
Chapter 12 Description of Parameter Settings
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12.1-03-28