Mitsubishi Electric FR-F740 EC Instruction Manual page 497

Parameter
Bias and gain calibration for PID displayed value [C42 (Pr. 934) to C45 (Pr. 935)]
Set PID display bias coefficient for terminal 4 input with C42 (Pr. 934). (Initial value is the co-
efficient 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%.
Fig. 6-186: Bias and gain for PID displayed values
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 section 6.15.4.
Make adjustment by assuming C7 (Pr. 905) as C45 (Pr. 935), and Pr. 126 as C44 (Pr. 935).
NOTE
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.
FR-F700 EC
100
Bias
C42 (Pr. 934)
20
0
4
0
C43 (Pr. 934)
Initial value
100%
Frequency setting
20mA
signal
C45 (Pr. 935)
PID control
Gain
C44 (Pr. 935)
I002111E
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