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Special operation and frequency control
(11) Bias and gain calibration for PID displayed values (C42(Pr. 934) to C45(Pr. 935))
⋅ When both of C42(Pr.934) and C44(Pr.935) ≠ "9999", bias/gain calibration is available for analog value of set
point, measured value, deviation value to perform PID control.
⋅ "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 193.
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.
100
0
Frequency setting signal
100%
Initial value
Bias
C42(Pr.934)
Gain
C44(Pr.935)
0
20
4 20mA
Coefficient
C43(Pr.934) C45(Pr.935)