Chapter 12 Description of Parameter Settings
MH300
Use this parameter only for AVI or ACI analog input.
Requirements for negative frequency (reverse running)
1. Pr.03-10 = 1
2. Bias mode = Bias serves as the center
3. Corresponded analog input gain < 0 (negative); this makes the input frequency negative.
In using the additional analog input function (Pr.03-18 = 1), when the analog signal is negative
after the addition, you can set this parameter to allow or not allow the reverse direction. The result
after adding is restricted by the “Condition for negative frequency (reverse running)”.
In the diagram below, black line is voltage-frequency curve with no bias; gray line is voltage-
frequency curve with bias.
Diagram 01
Diagram 02
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