User guide

8-14 Beginning Programming

Retract Acceleration

This is the parameter that controls how fast the dispensing head comes up to the Retract

Speed. You may need to set this high for small dispensing moves. The units are

inches/second squared. Typically, 300 in/sec

is sufficient.

Retract Distance

This is a vertical distance that the dispensing head moves after dispensing. The Retract

Distance must be within the Safe-Z Height defined in Initial Setup. The Retract Distance can

be reduced to increase dispensing speed. However, the dot quality will be affected in viscous

fluids. The units are inches. Typically, 100 mils (0.1 in) is sufficient.

Suckback

At the end of dispensing a line or a dot, the valve is reversed for the Suckback period to

remove any material from the tip of the needle. The Suckback value should be set according

to fluid viscosity. Generally, 10 ms (0.010 sec) is sufficient.

PostDwell

The amount of dwell time in seconds that the Z-head remains in the XY position after the

Z-head retracts in the Z-axis (see the description of the Dwell parameter above). This

parameter is available for use in ZFast mode only and should be used for fluids with a

tendency to string. When used, the total dwell time is the sum of both parameters.

4. Click on OK to close the Edit Dot Parameters dialog box and return to the

Programming Window.