5-32
F18
C50
C32, C34
C37, C39
C42, C44
Bias (Frequency command 1)
Bias (for Frequency 1) (Bias base point)
Analog Input Adjustment for [12] (Gain, Gain base point)
Analog Input Adjustment [C1] (Gain, Gain base point)
Analog Input Adjustment [V2] (Gain, Gain base point)
When any analog input for frequency command 1 (F01) is used, it is possible to define the
relationship between the analog input and the reference frequency by multiplying the gain and
adding the bias specified by F18.
As shown in the graph below, the relationship between the analog input and the reference
frequency specified by frequency command 1 is determined by points "A" and "B." Point "A" is
defined by the combination of the bias (F18) and its base point (C50); Point "B," by the
combination of the gain (C32, C37 or C42) and its base point (C34, C39 or C44).
The combination of C32 and C34 applies to terminal [12], that of C37 and C39, to [C1] (C1
function), and that of C42 and C44, to [C1] (V2 function).
Configure the bias (F18) and gain (C32, C37 or C42), assuming the maximum frequency as
100%, and the bias base point (C50) and gain base point (C34, C39 or C44), assuming the full
scale (10 VDC or 20 mA DC) of analog input as 100%.
• The analog input less than the bias base point (C50) is limited by the bias value
(F18).
• Specifying that the data of the bias base point (C50) is equal to or greater than
that of each gain base point (C34, C39 or C44) will be interpreted as invalid, so
the inverter will reset the reference frequency to 0 Hz.
Example: Setting the bias, gain and their base points when the reference frequency 0 to 100%
follows the analog input of 1 to 5 VDC to terminal [12] (in frequency command 1).
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