Pressurize Before Opening Dv Feature - Graco HFRL Setup And Operation Manual

Once dispensing, the screen will appear similar to F
39. When the dispense is completed (or aborted early
by re-triggering the footswitch during the dispense), the
system will return to the circulation state, the display
will appear as shown in F
ers will be incremented accordingly.
F . 40: System Circulating Automatically after a
IG
Shot Mode Dispense
To stop the circulation process, press the "
when the pumps are circulating.
F . 41: System Circulating Automatically after a
IG
Sequence Mode Dispense
3A2175Z
. 40, and the material count-
IG
" key
.
IG
F . 42: System Circulating Automatically after a
IG
Sequence Mode Dispense in PLC Control
Pressurize Before Opening DV
Feature
HFR logic versions 1.12.008 and later, a "Pressurize
Before Opening DV" feature was added to the "Auto
Circulate Between Dispenses" option as indicated in
the Advanced Screen 6 shown below. The new feature
is intended to pressurize the two materials to the cor-
rect values to ensure the mix quality at the dispense
start is optimal. This feature eliminates the need to add
restriction to the material return lines in an attempt to
match the recirculation and dispense pressures.
F . 43: Pressurize Before Opening DV Feature ON
IG
Appendix H- Circulation
113