9-22
F18
Bias (for frequency command 1) Refer to C50, C32, C34, C37 and C39.
If you select any analog input for frequency command 1, it is possible to define the relationship
between the analog input and the set frequency arbitrarily by combining the settings for bias
(F18), bias reference point (C50), gains (C32 and C37), and gain reference points (C34 and
C39) as shown below.
Function code Function Data entry range (%)
F18 Bias -100.00 to 100.00
C50 Bias reference point 0.00 to 100.00
C32 Gain for terminal [12] 0.00 to 200.00
C34 Gain reference point for terminal [12] 0.00 to 100.00
C37 Gain for terminal [C1] 0.00 to 200.00
C39 Gain reference point for terminal [C1] 0.00 to 100.00
As illustrated in the graph below, the relationship between the set frequency and analog input
for frequency command 1 is shown by a straight line passing through points "A" and "B." The
"A" is determined by the bias (F18) and its reference point (C50). The "B" is determined by the
gain (C32 or C37) and its reference point (C34 or C39). The combination of C32 and C34 will
apply for terminal [12] and that of C37 and C39 for terminal [C1].
The bias (F18) and gain (C32 or C37) should be set, assuming the maximum frequency as 100%.
The bias reference point (C50) and gain frequency point (C34 or C39) should be set, supposing
the full scale (10 VDC or 20 mADC) as 100%.
If the set frequency 1 is set with the built-in potentiometer, point B is prefixed at both the gain
and its reference point being 100%.
Analog input under the bias reference point is limited by the bias data.
The relations stated above are stated in the following expressions:
(1) If analog input d bias reference point:
(F18)Bias=(%)1SettingFrequency
(2) If analog input > bias reference point:
(%)inputAnalog(%)
point)reference(Biaspoint)reference(Gain
(Bias)(Gain)
(%)1SettingFrequency u
point)reference(Biaspoint)reference(Gain
point)reference(Bias(Gain)point)reference(Gain(Bias)
uu
C50C34
C50×C32C34×F18
+(%)inputAnalog×(%)
C50C34
F18C32
=
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