Owner's manual

6-30 Beginning Programming
6.6.3 Post Dispense Line Parameters
Item Description
Backtrack Gap
This is the vertical distance that the dispensing head moves up after
completion of a move. At the end of a move, the dispensing head raises
the Backtrack Gap, and then moves the Backtrack Length back over the
line that was just dispensed. This encourages congealed fluids to detach
and distributes any excess fluid back across the line. The units are inches.
Backtrack Gap should be at least double the Dispense Gap.
Backtrack Length
This is the horizontal distance that the dispensing head moves back over
the dispensed line after moving up the Backtrack Gap distance. This
encourages congealed fluids to detach and distributes any excess fluid
back across the line. The units are inches. Typically, 30-40 mils (0.030-
0.040 in) is sufficient.
Backtrack Speed
This is the speed that the dispensing head travels when moving along the
Backtrack Length. The units are inches/second. Typically, 2 in/sec is
sufficient.
Retract Distance
This is a vertical distance that the dispensing head moves after the
Backtrack Gap and Backtrack Length dispensing commands have
completed. Figure 6-20 shows the relationship between Retract Distance,
Backtrack Gap and Backtrack Length. The Retract Distance must be within
the Safe-Z Height defined in Initial Setup. The units are inches. Typically,
250 mils (0.250 inch) is sufficient.
Retract Speed
This is the speed of the dispensing head while moving the Retract
Distance. The units are in inches/second. Typically, 2 in/sec is sufficient.
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/second2. Typically, 300 in/sec2 is sufficient.
Figure 6-19 Post Dispense Line Parameters