Graco 334135B Adjust Open Dispense Valve ODV Timing, Operator Mode Screen

Setup

Adjust Open Dispense

Valve (ODV) Timing

When a shot is performed, the dispense valve needs to open at a precise time for material to be dispensed properly. If the dispense valve opens too early, material may drain from the static mixer before the shot starts. If the dispense valve opens too late, pressure may build in the machine before the dispense valve opens, causing material to forcefully spray out of the mixer.

The Open Dispense Valve Timing should also be adjusted for material viscosity. Thicker materials should have the dispense valve open earlier and thinner materi- als should have the dispense valve open later.

A positive value for Open Dispense Valve Timing indi- cates the dispense valve will open after the piston is engaged in the cylinder. A negative value indicates the dispense valve will open before the piston is engaged in the cylinder.

If a high positive number is entered for ODV timing, such as 6.0 mm, the dispense valve may not open resulting in the fluid stalling against the dispense valve. The fluid in the hose lines will remain under pressure until the piston is manually retracted using the Manual screen, see

Operator Mode Screen.

FIG. 8: Open Dispense Valve Position Calibration

1.Navigate to the Open Dispense Valve Position Calibration Screen.

2.Press the Dispense Valve Open Position Adjust but-

ton, ( ).

3.Use the up and down arrows to enter a value for the ODV Timing.

4.Press the Enter button ( ) to accept the new

value or press the Abort/Cancel button ( ) to keep the previous value.

32 334135B