Graco HFRL Setup And Operation Manual page 75

• Pressurize Before Opening DV: This option will be
available if the "Auto Circulate Between Dispenses"
feature is enabled. This option is designed to adjust
the material pressures to the correct values to
ensure mixing at the dispense start is optimal. If
this option is enabled, the HFR will pressurize the
lines before opening the dispense valve (DV) during
an Auto Circulate to dispense transition, based on
the settings entered in the "Maximum Pressurize
Time" and "Minimum Stall to Pressure" entries.
For example, if a dispense at 50 cc/second pro-
duces a pressure of 100 bar on the selected "Con-
trolling/ Stall Pump", the dispense valve will open
when either the pump reaches 86 bar (86 % of 100
bar = 86 bar) or 3000 milliseconds of charging time
is reached.
• Maximum Pressurize Time: This option will be
available if the "Pressurize Before Opening DV" fea-
ture is enabled. This option setting will dictate the
maximum amount of pressure charge time the con-
trol is allowed prior to opening the dispense valve
during the circulation to dispense transition.
3A2175Z
Appendix B - ADM Setup Screens Overview
Advanced Screen 7
The HFR setup Advanced #7 screen contains the fol-
lowing control options:
• Disable Pressure Imbalance Alarms – Checking
this option will disable the generation of pressure
imbalance alarms resulting from an excessive pres-
sure difference between the HFR Blue and Red
pumps. This control is intended to make the initial
installation of the HFR easier, and is typically not
intended to be "checked" when the machine is
used for production. This is especially true for
impingement type dispense valve options (GX-16,
GX-16 with Prox, L-Head) where excessive pres-
sure differences can cause problems within the dis-
pense valve.
• Control Dispense Ready Light – Checking this
option will reassign the I/O originally used to sense
an optional hydraulic tank low level sensor to an
output for driving a ready lamp. Typically a ready
lamp (LED) is installed in the handle of a dispense
valve.
When this function is checked or turned ON, the
ready lamp will be in one of the following states:
a. Not Ready (Dark or OFF) - This will occur when
not in a dispense mode (disable or night
modes), the user is on a setup screen when
idle, an alarm is active, the system is in low
pressure recirculation mode or not moving (full
recirculation type systems only), the system is
performing a manual or semi-automatic recir-
culation operation (Auto Circulate Between Dis-
penses is OFF), or when the stall to pressure
logic is OFF (Fusion/P2 dispense valve type
systems only).
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