Fuji Electric frenic mini series, User Manual

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9.2 Details of Function Codes
9-21
Chap. 9
FUNCTI
ON C
O
DE
S
F18 Bias (for Frequency Command 1)
Refer to C50, C32, C34 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
≤
bias reference point:
(F18) Bias = (%) 1 Setting Frequency
(2) If analog input > bias reference point:
(%) input Analog (%)
point) reference (Bias point) reference (Gain
(Bias) (Gain)
(%) 1 Setting Frequency
×
−
−
=
point) reference (Bias point) reference (Gain
point) reference (Bias (Gain) point) reference (Gain (Bias)
−
× − ×
+
C50 C34
C50 × C32 C34 × F18
+ (%) input Analog × (%)
C50 C34
F18 C32
=
−
−
−
−