Mitsubishi Electric FR-A700 Technical Manual page 375

(9) Calibration example
(A detector of 4mA at 0 and 20mA at 50
The set point is given across inverter terminals 2-5 (0 to 5V).)
Start
Determination of set point
Determine the set point of
what is desired to be adjusted.
Conversion of set point into %
Calculate the ratio of the set
point to the detector output.
Make calibration.
Setting of set point
Input a voltage across terminals
2-5 according to the set value %.
Operation
Set the proportional band ([Pr.
129]) to a slightly larger value,
the integral time ([Pr. 130]) to
a slightly longer time, and the
differential time ([Pr. 134]) to
"9999" (no function), and turn
ON the start signal.
Is the set point stable?
No
Parameter adjustment
To stabilize the measured value,
change the proportional band ([Pr.
129]) to a larger value, the integral
time ([Pr. 130]) to a slightly longer
time, and the differential time ([Pr.
134]) to a slightly shorter time.
Adjustment end
*
When calibration
is required
is used to adjust the room temperature to 25
Set the room temperature to 25
Set [Pr. 128] and turn ON the X14 signal to enable PID control.
Detector specifications
When 0 4mA and 50 20mA are used, the set point 25
the assumption that 4mA is 0% and 20mA is 100%.
Make the following calibration* when the target setting input (0 to 5V) and
detector output (4 to 20mA) must be calibrated.
When the set point is 50%
As the terminal 2 specifications are 0%
to the terminal 2 for the set point of 50%.
When the parameter unit is used for operation, input the set point (0 to
100%) in [Pr. 133].
When performing operation, first set the proportional band ([Pr. 129]) to a
slightly larger value, the integral time ([Pr. 130]) to a slightly longer time,
and the differential time ([Pr. 134]) to "9999" (no function), and while
looking at the system operation, decrease the proportional band ([Pr. 129])
and increase the integral time ([Pr. 130] .
Yes
Parameter optimization
While the measured value is stable
throughout the operation status, the
proportional band ([Pr. 129]) may be
decreased, the integral time ([Pr. 130]
) decreased, and the differential time
([Pr. 134]) increased.
Using [Pr. 125, C2 to C4 (Pr.902, 903)] (terminal 2) or [Pr. 126, C5 to C7 (Pr.904,
905)] (terminal 4), calibrate the detector output and target setting input.
Make calibration in the PU mode during an inverter stop.
409
under PID control.
.
is 50% on
0V and 100% 5V, input 2.5V
PARAMETER
2