Function Applications
-432-
Step
Related Parameters
Description
(Step 3) Select an AI curve for the AI
terminal:
Select a curve and filter time for the
AI terminal.
F4-48
Select the AI curve. (You can select any AI
curve for an AI terminal. Typically, F4-48 is set
to the default value 321. That is, curve 1 is
selected for AI1, curve 2 for AI2, and curve 3
for AI3.)
Set the following
parameters on the power
supply unit:
A1-05, A1-06
A2-05, A2-06
A3-05, A3-06
Set the AI filter time.
A1-05 and A1-06: Filter time of AI1 and AI2 of
the power supply unit
A2-05 and A2-06: Filter time of AI1 and AI2 of I/
O extension card 1
A3-05 and A3-06: Filter time of AI1 and AI2 of I/
O extension card 2
(Step 4) Set the AI curve:
Set the relationship between the AI
voltage/current inputs and
frequency setpoints.
F4-31 to F4-34 Set curve 1.
F4-35 to F4-38 Set curve 2.
F4-39 to F4-42 Set curve 3.
A6-00 to A6-07 Set curve 4.
A6-08 to A6-15 Set curve 5.
F4-49
Set the solution for cases where AI input is
less than the minimum input reference (When
AI is used as the frequency reference source,
the setpoint 100% corresponds to the
maximum frequency (F0-10).)
Setting AI Curve
Five types of AI curves are available. Curves 1 to 3 are two-point curves, and the related parameters are
F4-31 to F4-42. Curves 4 and 5 are four-point curves, and the related parameters are in group A6.
● For the current-type AI curve, 1 mA current corresponds to 0.5 V voltage, that is, 20 mA corresponds
to 10 V.
● When the analog input voltage is greater than the maximum input voltage (F4-31), the maximum
input voltage is used. Similarly, when the analog input voltage is less than the minimum input
voltage (F4-33), the minimum input voltage or 0.0% is used as defined by F4-49 (setting for the AI
lower than the minimum input).
Take the setting of AI curve 1 as an example. The following figure shows the voltage-type AI curves and
current-type AI curves. When the voltage-type curve is used, 4 mA to 20 mA typically corresponds to 0
Hz to 50 Hz or –50 Hz to +50 Hz. The related parameters include F4-31 to F4-34.
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