Fuji Electric FRENIC-HVAC User Manual page 356

In the case of unipolar input
(terminal [12] with C35 = 1, terminal [C1], terminal [V2] with C45 = 1)
As shown in the graphs above, the relationship between the analog input and the reference
frequency specified by frequency command 1 (F01) 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 and its base point (C32 and C34, C37 and C39, or C42 and
C44).
The relationship between the analog input and the reference frequency specified by
frequency command 2 (C30) is determined by points "A" and "B." Point "A" is defined by
the combination of the bias and its base point (C55 and C56, C61 and C62, or C67 and C68),
Point "B," by the combination of the gain and its base point (C32 and C34, C37 and C39, or
C42 and C44).
The combination of C32 and C34 applies to terminal [12], that of C37 and C39, to [C1], and
that of C42 and C44, to [V2].
Configure the bias and its gain, assuming the maximum frequency as 100%, and the bias base
point and gain base point, assuming the full scale (10 VDC or 20 mA DC) of analog input as
100%.
Frequency command 1 (F01)
• 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.
Frequency command 2 (C30)
• The analog input less than the bias base point (C56, C62 or C68) is limited by the
bias value (C55, C61 or C67).
• Specifying that the data of the bias base point (C56, C62 or C68) 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 60
Hz follows the analog input of 1 to 5 VDC applied on terminal [12] with the
maximum frequency 60 Hz (F03)
(Point A)
Frequency command 1 (F01)
To set the reference frequency to 0 Hz for an analog input being at 1 V, set the bias to 0%
(F18 = 0). Since 1 V is the bias base point and it is equal to 10% of 10 V (full scale of terminal
[12]), set the bias base point to 10% (C50 = 10).
Frequency command 2 (C30)
Just as frequency command 1, set the bias to 0% (C55 = 0) and the bias base point, to 10%
(C56 = 10).
6-46