Graco 3A2098H Dispense From Maintenance Screen, Manually Adjust Control Loop Parameters

3.Manually dispense material into the beaker. Hold the beaker so that the stream of material is sub- merged in the captured material to minimize air entrapment in the container.

4.Record the volume dispensed on Fluid Plate x, screen 1. See FIG. 30 on page 43.

5.Settle the material into the beaker and view the actual volume dispensed.

6.Calculate the new flow meter K-factor:

Operation

6.Optional: To fine tune the step response in pressure mode, gradually increase the Kd value.

NOTE: Increasing Kd (pressure only) is typically not necessary but it may improve step response. However setting Kd too high may cause the system to oscillate.

7. Stop dispensing.

Dispense From Maintenance Screen

1.Navigate to Fluid Plate x, screen 1 for the desired fluid plate.

K-Factor (new) =

displayed volume (cc) x K-Factor (old)

dispensed volume (cc)

7.Enter new K-factor.

8.Repeat the procedure to verify the new K-factor.

Manually Adjust Control Loop Parameters

NOTE: It is recommended that these values not be changed from the factory defaults of 32.00 for Kp, 128.00 for Ki, and 0.00 for Kd.

If the system is not maintaining the desired setpoint while in pressure or bead control mode, manually change the Kp and Ki values:

NOTE: Pressure parameters should be adjusted first, even if you typically operate in bead control mode.

1. Begin dispensing material.

NOTE: Begin a new dispense each time control param- eters are changed.

2.If the regulator outlet pressure does not closely fol- low the desired pressure, set Ki to zero then increase Kp until the proper pressure control is achieved.

3.If the regulator outlet pressure oscillates rapidly above and below the commanded pressure, decrease Kp by 10%. Continue to decrease the Kp value in 10% increments until the outlet pressure is stable.

4.Set Ki value to 2 then increase the Ki value until the system oscillates.

5.Decrease Ki until oscillation stops.

FIG. 30

2. Press to enter maintenance screen.

FIG. 31

3.Press to open the Control Mode drop-down list, and select the preferred control mode. Press again to exit the drop-down list.

3A2098H 43