Graco HFRL, Setup And Operation Manual

Page: 110 / 142

Appendix H- Circulation
110 3A2175Z
Manual and Semi-Automatic
Circulation Feature Operation
To implement the feature, a soft key option on the main
Operator mode run screen has been added (“ ”),
as shown below.
As illustrated in F
IG
. 30, the HFR is configured to dis -
pense in constant pressure mode, which while dispens -
ing will appear similar to the screen shown below:
If recirculating the material is desired, the user will need
to stop the dispense, then press the circulation option
(“ ”). If selected, the user will be given the option to
select a flow rate for the recirculation dispense, as
shown below. The circulation feature will only operate
in flow mode, regardless of whether the user is dis -
pensing out of the valve in constant pressure or flow.
The user can now circulate the material by pressing the
dispense key (“ ”), pressing the footswitch, and
requesting dispense from either the CGM or DGM inter -
face. A manual recirculation dispense will circulate the
materials, apply heat (if necessary), and not command
the dispense valve to open.
In addition, corresponding error generation logic is
turned off (cavitation, pressure imbalance, off ratio,
etc.) since material is not being dispensed. Also,
material counters are not incremented since material is
not being dispensed.
F
IG
. 30: Main Operator Mode Run Screen, with
Recirculation Option.
F
IG
. 31: Main Operator Mode Run Screen,
Dispensing in Constant Pressure Mode.
F
IG
. 32: Main Operator Mode Run Screen, with
Circulation Option Selected.