Mitsubishi Electric FR-E800, Instruction Manual

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15. (A) Application Parameters
15.5 Calibration of PID display
15.5
Calibration of PID display
When the operation panel or the parameter unit (FR-PU07) is used, the display unit of parameters and monitor items related
to PID control can be changed to various units.
*1 On the LCD operation panel or the parameter unit used as the command source, the parameter number in parentheses appears instead of that
starting with the letter C.
 Calibration of PID display bias and gain (C42 (Pr.934) to C45 (Pr.935))
• When both C42 (Pr.934) and C44 (Pr.935) ≠ "9999", the bias and gain values for the set point, measured value and
deviation in PID control can be calibrated.
• "Bias"/"gain" function can adjust the relation between PID displayed coefficient and measured value input signal that is
externally input. Examples of these measured value input signals are 0 to 5 VDC, 0 to 10 VDC, or 4 to 20 mADC. (The
terminals used for measured value input can be selected at
Pr.128, Pr.609, Pr.610 .)
• Set the value that is displayed when the PID measured value (control amount) is 0% to C42 (Pr.934) and the value that is
displayed when the PID measured value (control amount) is 100% to C44 (Pr.935) .
• When both 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%.
• There are three methods to adjust the PID display bias/gain.
(Refer to page 318 for details, and make the necessary adjustments by considering C7 (Pr.905) as C45 (Pr.935) and Pr.126
as C44 (Pr.935) .
Pr. Name Initial value
Setting
range
Description
759
A600
PID unit selection 0
0 to 43
Change the unit of the PID control-related values that is
displayed on the LCD operation panel (FR-LU08) or the
parameter unit (FR-PU07).
9999 Without display unit switching
C42 (934)
A630
*1
PID display bias coefficient 9999
0 to 500
Set the coefficient of the bias side (minimum) of measured value
input.
9999 Displayed in %.
C43 (934)
A631
*1
PID display bias analog value 20% 0% to 300%
Set the converted % of the bias side (minimum) current/voltage
of measured value input.
C44 (935)
A632
*1
PID display gain coefficient 9999
0 to 500
Set the coefficient of the gain side (maximum) of measured value
input.
9999 Displayed in %.
C45 (935)
A633
*1
PID display gain analog value 100% 0% to 300%
Set the converted % of the gain side (maximum) current/voltage
of measured value input.
100
0
0
0
0
Frequency setting signal
100%
20mA
5V
10V
C45(Pr.935)
Initial value
Bias
C42(Pr.934)
Gain
C44(Pr.935)
20
4
1
2
C43(Pr.934)
Coef
ficient
Method to adjust any point by application of a current (voltage) to the measured value input terminal
Method to adjust any point without application of a current (voltage) to the measured value input terminal
Method to adjust only the display coefficient without adjustment of current (voltage)