Setup; Enter Data; Prime The Dispense Head - Graco PR70 Operation & Maintenance Manual

Setup

Setup
Setup includes entering parameters, homing pumps,
priming, phasing, and setting the ratio.

Enter Data

Entering data for the desired application includes the fol-
lowing:
1. On the Shot/Flow screen enter the shot size and
flow rate in the one of the ten preset values. Pick the
preset shot by pushing the parameter number push-
button.
2. On the Shot/Flow screen enter the volumetric ratio.
Note this value must be entered even on fixed ratio
PR70's. This value is used to calculate the maxi-
mum shot size that can be dispensed before reload-
ing. Also note on the PR70 variable ratio model the
mechanical ratio beam must still be manually set to
the correct ratio.
3. On the Shot/Flow screen pick the pump mode and
dispense mode. If the pump mode is pressure, enter
the high and low pressure setpoints.
4. On the Feed Control screen pick the operating
mode for the tanks or accumulators. If using the
auto fill mode, set the fill timers.
5. If the PR70 is heated, go to the Temperature screen
and enter the desired temperature values for the
loads being used.
26

Prime the Dispense Head

NOTICE
If the dispense head is not primed, chemical cross-
over may occur resulting in cured material in the dis-
pense head, hoses, and/or pumps.
For MD2 Valve:
1. Remove static mixer from the dispense head (102)
if installed.
2. Turn snuff-back adjustment knob fully clockwise.
This will prevent the dispense valve from closing
between priming shots.
3. Use a 4 mm hex key to loosen the screws (102a)
holding the dispense head in place.
4. Rotate dispense head (102) so the tip is above the
fluid input hoses.
102
102a
F . 3: Prime Dispense Head
IG
5. Use a 4 mm hex key to tighten screws (102a) hold-
ing dispense head in place.
6. Route the fluid hoses connected to the dispense
head so they are always below the dispense head.
This ensures any air in the hoses will travel to the
dispense head.
7. Navigate to the Home Screen. See HMI Navigation
Overview, page 9.
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