Mitsumi electronic 55K, FR-F520-0.75K instruction manual Calibration example, Start

PARAMETERS

(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).)

START

Convert the set point into %

Calculate the ratio of the set point to the detector output.

Calibrate

Set the set point.

Enter a voltage to across terminals 2-5 according to the set point (%).

Determine the set point

Determine the set point of the item to be adjusted.

Operation

Set the proportional band and integral time to slightly higher values and the differential time to 9999 (No control), and switch on the start signal.

Is the process value steady?

No

((((((Detector specifications

When the detector used has the specifications that 0° C (32° F) is equivalent to 4mA and 50° C to 20mA, the set point of 25° C (77° F) is 50% because 4mA is equivalent to 0% and 20mA to 100%.

((((((The set point setting input (0 to 5V) and detector output (4 to 20mA) must be calibrated*.

((((((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.

((((((Set the room temperature to 25° C (77° F).

Set Pr. 128 and switch on the X14 signal to enable PID control.

((((((For PU operation, set the set point (0 to 100%) in Pr. 133. During operation, set the proportional band and integral time to slightly higher values and set the differential time to 9999 (No control). In accordance with the system operation, reduce the proportional band and integral time. For slow response system where a deadband exists, differential control shuold be turned on and increased slowly.

Yes

4

Adjust parameters. Optimize parameters.

Set the proportional band and integral time to slightly higher values and set the differential time to a slightly lower value to stabilize the process value.

While the process value is steady, the proportional band and integral time may be reduced and the differential time increased throughout the operation.

END

*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 in the PU mode during an inverter stop.

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