275
PID control
4
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 179
.
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
Analog input display
unit switchover
0
0
Displayed in %
Select the unit of analog input display.
1
Displayed in V/mA
759
PID unit selection
9999
0 to 43, 9999
This parameter changes unit of parameters and monitored
items that are related to PID control.
C42
(934)
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)
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)
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)
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".
...
Specifications differ according to the date assembled.
to check the SERIAL number.
*1
This parameter allows 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
Coef
ficient
C43(Pr.934)
C45(Pr.935)
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