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Operation
Operator Mixer Manifold Controls (See Fig
6)
Dispense Vahe Knobs (A)
Use to adjust the resin and catalyst dispense valve
openings, limiting the maximum fluid flow rate into the
mixing block and minimizing valve response time.
NOTE This setting
is of minimal importance when the
spray gun controls the process, except that the valves
must be open enough to allow adequate fluid flow.
For most applications,
set
the knobs on their second
detent.
Purge Valve Knobs (E)
ings, limiting the flow rate into the mixing block.
Use to adjust the air and solvent purge valve open-
Fluid Shut-Off Knobs (C)
Use to close the fluid ports from the volume counters
to the integrator during a ratio check. Turn the knobs
out to open the fluid passages to the integrator.
Ratio Check Valve Knobs (D)
Use to measure the amount of resin and catalyst
These knobs should not be opened unless the fluid
component flowing to the mixing block (volume ratio).
shut-off knobs are closed.
NOTE: The following instructions presume a standard
system: with pressure supply tanks for the paint and
solvent. Also see Optional System Arrangements
on page 7 for possible variations and their effect
on
the instructions.
Flushing the Mixing System
Flush the mixing system with solvent and air
at the
which is longer than the pot life of the fluid. Follow the
end of each production day or before any break
flushing procedure in the controller manua1308-192.
WARNING
Setting the Fluid Supply Tank Pressure
Turn on the air supply and recharge the paint and
sol-
vent tanks with air. Adjust the air pressure
to:
Solvent
-
70
psi
(5
bar).
Resin and Catalyst
-
30 to 70 psi (2 to 5 bar).
Pressure to the two tanks should be equal unless one
viscous component should have a higher pressure
component is more viscous, in which case the more
setting. Different pressures will not effect the mix ratio
but they may cause surges in the mixed fluid stream:
12 300-280
Starting Production
NOTE When you first
start up the system after it has
been shut down for a period of time, it will cycle rapid-
ly until system pressure is built back up. This is nor-
mal and there is no cause for alarm.
1.
2.
3.
4.
5.
Check that paint and solvent supply tanks are
filled.
Check that fluid valves are turned on and the fluid
pressure to the PrecisionMix is properly set.
Check thatthe air pressure to the PrecisionMix is
properly set: most applications require about
80
psi (6 bar),
60
psi (4.2 bar) is the minimum set-
ting.
Check that the PrecisionMix fluid shut-off knobs,
dispense valve knobs, and purge valve knobs are
all opened. See Fig
6.
Turn on the main power switch and follow
the
operating instructions for your controller.
During Production:
Make sure that all air is removed from the fluid
lines of the system.
If the paint output is too low, increase the air pres-
sure on both supply tanks: if too high, reduce the
air pressure, close the dispense valves further, or
adjust the fluid pressure regulator.
1
-
CAUTION
Do not use the first
4 to
5
oz. (120 to 150 ml) of
ouahlv mixed.
paint from the system, as it may not be thor-
1
*
Check the air pressure regulators on the supply
tanks. The feed pressures should be about the
same.
Check or reset the air regulator in the spray air
line.
Check or reset the (optional) fluid pressure regula-
tor on the static mixer outlet. Use the adjustment
key to adjust the regulator.
WARNING
To reduce the risk of serious injury,
including fluid
always follow the Pressure Relief Procedure on
injection or splashing fluid in the eyes or on skin,
page 2 and disconnect all power to the Precision-
Mix before checking or servicing any part of the
system, before installing, cleaning, or changing
fluid tips, and whenever you stop spraying.
A
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