Emerson Process Management 1500 manual 7.5.1Configuring overshoot compensation

Configuring the Filling and Dosing Application

7.5.1Configuring overshoot compensation

Fixed overshoot compensation is used if the compensation value is already known. To configure fixed overshoot compensation:

1.Disable the Enable AOC checkbox in the Filling panel (see Figure 7-3).

2.Set AOC Algorithm to Fixed.

3.Click Apply.

4.Specify the appropriate value for Fixed Overshoot Comp. Enter values in the unit used for the flow source.

5.Click Apply.

Note: Do not enable the Enable AOC checkbox. The Enable AOC checkbox is enabled only for underfill or overfill.

To configure automatic overshoot compensation for underfill or overfill:

1.Enable the Enable AOC checkbox in the Filling panel (see Figure 7-3).

2.Set AOC Algorithm to Underfill or Overfill.

3.Set AOC Window Length:

•If standard AOC calibration will be used, specify the maximum number of fills that will be used to calculate the AOC coefficient during calibration.

•If rolling AOC calibration will be used, specify the number of fills that will be used to calculate the AOC coefficient.

4.Click Apply.

5.If standard AOC calibration will be used, follow the instructions in Section 7.5.2. If rolling AOC calibration will be used, follow the instructions in Section 7.5.3.

7.5.2Standard AOC calibration

Note: In common use, the first training fill will always be slightly overfilled because the default compensation factor is 0. To prevent this, set the AOC Coeff value in the Run Filler window (see Figure 8-1) to a small positive number. This value must be small enough so that when it is multiplied by the flow rate, the resulting value is less than the fill target.

To perform standard AOC calibration:

1.Click ProLink > Run Filler. The window shown in Figure 8-1is displayed.

2.Click Start AOC Cal. The AOC Calibration Active light turns red, and will remain red while AOC calibration is in progress.

3.Run as many fills as desired, up to the number specified in AOC Window Length.

Note: If you run more fills, the AOC coefficient is calculated from the x most recent fills, where x is the value specified for AOC Window Length.

4. When the fill totals are consistently satisfactory, click Save AOC Cal.

The AOC coefficient is calculated from the fills run during this time period, and is displayed in the Run Filler window. This factor will be applied to all subsequent fills while AOC is enabled, until another AOC calibration is performed.

64 Micro Motion® Model 1500 Transmitters with the Filling and Dosing Application