Filter
Top Products
273
PID control
4
PARAMETERS
4.20.2 Bias and gain calibration for PID displayed values
(Pr. 241, Pr. 759, C42(Pr. 934) to C45(Pr. 935))
(1) Calibration for PID displayed values (C42(Pr. 934) to C45(Pr. 935))
⋅ 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 177.
Make adjustment by assuming C7 (Pr. 905) as C45 (Pr. 935), and Pr. 126 as C44 (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.
Parameter
Number
Name
Initial
Value
Setting
Range
Description
241 *1
Analog input display
unit switchover
0
0 Displayed in %
Select the unit of analog input display.
1 Displayed in V/mA
759
*1
PID unit selection 9999 0 to 43, 9999
This parameter changes unit of parameters and monitored
items that are related to PID control. Refer to page 320.
C42
(934)
*2
PID display bias
coefficient
9999
0 to 500.00 Set the coefficient on bias (minimum) side of terminal 4 input.
9999 Displayed in %.
C43
(934)
*2
PID display bias
analog value
20% 0 to 300.0%
Set the converted % on bias (minimum) side current /voltage of
terminal 4 input.
C44
(935)
*2
PID display gain
coefficient
9999
0 to 500.00
Set the coefficient on gain (maximum) side of the terminal 4
input.
9999 Displayed in %.
C45
(935)
*2
PID display gain
analog value
100% 0 to 300.0%
Set the converted % on gain (maximum) side of current/
voltage of terminal 4 input.
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 190)
... Specifications differ according to the date assembled. Refer to page 400 to check the SERIAL number.
*1 The above parameters allow its setting to be changed during operation in any operation mode even if "0" (initial value) is set in Pr. 77 Parameter
write selection.
*2 The parameter number in parentheses is the one for use with the parameter unit (FR-PU04/FR-PU07(-01)).
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)