Appendix H- Circulation; Manual, Semi-Automatic And Fully Automatic Circulation Features; Manual Recirculation Feature; Semi-Automatic Circulation Feature - Graco HFRL Setup And Operation Manual

Appendix H- Circulation

Manual, Semi-Automatic and
Fully Automatic Circulation
Features
In 2016 a manual and Semi-Automatic circulation fea-
ture was added to the HFR product which allowed the
user to circulate the materials back to the tank at low
pressure, enabling the system to heat or condition the
two component materials prior to a dispense. In April
2019, a fully Automatic Circulation feature was added
(using the Semi-Automatic Circulation hardware com-
ponents) which allows the user to transition between
dispense and circulation states automatically without
stopping the pumps.
The latest feature added also allows the user to operate
the circulation feature in Shot mode, and also
Sequence mode if using system version 1.11.003 or
later. Therefore, pre-calculated shot amounts (weights,
volumes or time increments) can be dispensed auto-
matically. The pumps can circulate material before and
after the dispense operation without stopping the
pumps.
All the described features are intended to be used by
HFR systems which use the standard non-recirculating
dispense valve options (MD2, P2/ Fusion, Auto-Fusion
and EP dispense valve options). The Manual and
Semi-Automatic features are available on HFR systems
with logic versions 1.10.001 or later. The fully Automatic
feature is available on logic versions 1.11.001 or later.

Manual Recirculation Feature

This version uses the Graco circulation kits. Part num-
bers 24D107, 24E379, or equivalent hardware is recom-
mended. The circulation kits will provide a return fluid
path from the HFR output manifold back to the corre-
sponding material tanks.
This method puts the system into recirculation mode by
putting circulation valves on the dispense manifold into
the circulation position (as shown below), to divert the
blue and red materials back to their supplies.
3A2175Z
F . 26: HFR Manifold Valves in the Manual
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Circulation Positions
Semi-Automatic Circulation
Feature
This version uses the Graco circulation kits, part
numbers 24N486, 24N487. These kits contain
externally controlled valves, and the valve control
solenoid kit part number 24N990. These circulation kits
are intended to recirculate the two material paths from
the dispense valve back to the material supplies. This
method keeps the F . 26 Manifold valves in the
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dispense positions. In Semi-Automatic mode allows
users to switch between dispense and circulation
modes using the ADM, an external robot, or PLC
control. if this method is used the "HFR Circulation
Valves installed" check box option on setup Advanced
#6 screen must be checked, as shown in F
F . 27: Advanced #6 Screen - Recirculation Valves
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Installed Option
Appendix H- Circulation
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