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Special operation and frequency control
(11) Bias and gain for PID displayed values(C42(Pr. 934) to C45(Pr. 935))
When both of C42(Pr.934) and C44(Pr.935)
measured value, deviation value to perform PID control.
1) Bias/gain calibration for PID displayed value(C42(Pr. 934) to C45(Pr. 935))
"Bias" / "gain" function can adjust the relation between PID displayed coefficient and measured value input
signal. Examples of measured value input signals are 0 to 5VDC, 0 to 10VDC, or 4 to 20mADC, and they are
externally input.
Set PID display bias coefficient for terminal 4 input with C42(Pr.934).
(Initial value is the coefficient for 4mA.)
Set PID display gain coefficient for 20mA of the frequency command current (4 to 20mA) with C44(Pr.935).
When both of C42(Pr.934) and C44(Pr.935) "9999" and Pr.133 is set as the set point, the setting of C42(Pr.934)
is treated as 0%, and C44(Pr.935) as 100%.
Three methods of bias/gain adjustment for PID displayed values are the following.
(a)Method to adjust any point by application of voltage (current) across the terminals 4 and 5.
(b)Method to adjust any point without application of voltage (current) across terminals 4 and 5.
(c)Method to adjust only the frequency without adjusting the voltage (current).
(For the detail of (a) to (c), refer to page 162.
Make adjustment by assuming C7 (Pr.905) as C45 (Pr.935), and Pr.126 as C44 (Pr.935).)
CAUTION
When the voltage/current input specifications are changed with voltage/current input switch and using Pr. 73 and Pr. 267, be sure
to make calibration.
2) Analog input display unit changing (Pr. 241)
You can change the analog input display unit (%/V, mA) for analog input bias/gain calibration.
Depending on the terminal input specification set to Pr. 73, Pr. 267, and voltage/current input switch the display
units of C3(Pr. 902), C4(Pr. 903), C43(Pr. 934), C45(Pr. 935) change as shown below.
Analog Command (Terminal 4)
(according to Pr. 73, Pr. 267, and Voltage/Current
Input Switch)
0 to 5V input
0 to 10V input
4 to 20mA input
Parameters referred to
Pr. 59 Remote function selection
Pr. 73 Analog input selection
Pr. 79 Operation mode selection
Pr. 178 to Pr. 189 (input terminal function selection)
Pr. 190 to Pr. 196 (output terminal function selection)
C2 (Pr. 902) to C7 (Pr. 905) Frequency setting voltage (current) bias/gain
230
"9999", bias/gain calibration is available for analog value of set point,
100
Bias
C42(Pr.934)
0
20
0
4
Frequency setting signal
C43(Pr.934)
Pr. 241 = 0 (Initial Value)
0 to 5V
displayed in 0 to 100%(0.1%).
0 to 10V
displayed in 0 to 100%(0.1%).
0 to 20mA
displayed in 0 to 100%(0.1%).
Refer to page 87
Refer to page 155
Refer to page 175
Refer to page 110
Refer to page 116
Initial value
Gain
C44(Pr.935)
100%
20mA
C45(Pr.935)
Refer to page 162
Pr. 241 = 1
0 to 100%
displayed in 0 to 5V(0.01V).
0 to 100%
displayed in 0 to 10V(0.01V).
0 to 100%
displayed in 0 to 20mA(0.01mA).

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