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Mitsubishi Electric FR-A500 Instruction Manual Page 151

Transistorized inverter.
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(7) Calibration example
(A detector of 4mA at 0°C (32°F) and 20mA at 50°C (122°F) is used to adjust the room temperature to 25°C
(77°F) under PID control.
The set point is given to across inverter terminals 2-5 (0-5V).)
Determine the set point.
Determine the set point of the
item to be adjusted.
Convert the set point into %.
Calculate the ratio of the set
point to the detector output.
Make calibration.
Set the set point.
Enter a voltage to across
terminals 2-5 according to
the set point (%).
Set the proportional band (Pr.129)
and integral time (Pr. 130) to slightly
time (Pr. 134) to "9999" (function
invalid) and switch on the start signal.
Is the process
value steady?
Adjust parameters.
Set the proportional band (Pr. 129)
and integral time (Pr. 130) to slightly
higher values and set the differential
time (Pr.134) to a slightly lower value
to stabilize the process value.
......Set the room temperature to 25 ° C (77 ° F).
Set Pr. 128 and switch on the X14 signal to enable PID control.
......Detector specifications
When the detector used has the specifications that 0 ° C is equivalent to
4mA and 50 ° C (122 ° F) to 20mA, the set point of 25 ° C (77 ° F) is 50%
because 4mA is equivalent to 0% and 20mA to 100%.
......When the set point setting input (0 to 5V) and detector output (4 to
20mA) must be calibrated, make the following calibration*.
......Set point = 50%
Since the specifications of terminal 2 are such that 0% is equivalent to
0V and 100% to 5V, enter 2.5V into terminal 2.
......For PU operation, set the set point (0 to 100%) in Pr. 133.
During operation, set the proportional band (Pr. 129) and integral time
(Pr. 130) to slightly higher values and set the differential time to "9999"
(function invalid). In accordance with the system operation, reduce the
proportional band and increase integral time (Pr. 130) for the slow
responce system, gradually increase the differential time (Pr. 134) using
differential control.
Optimize parameters.
While the process value is steady,
the proportional band (Pr. 129) and integral
time may (Pr. 130) be reduced and the
differential time (Pr. 134) increased
throughout the operation.
*When calibration is required, use Pr. 902 and Pr. 903 (terminal 2) or Pr. 904 and Pr. 905 (terminal 4)
to calibrate the detector output and set point setting input.
Perform calibration in the PU mode during an inverter stop.


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