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Troubleshooting
312781E 9
Troubleshooting
Isolate a Mixing Problem
A mixing problem can be caused by a problem with the
controller, meters, and solenoid valves, as well as the
mix manifold.
1. To isolate the problem, check for any visible faults or
errors:
a. Are all air and fluid tubes, hoses, and electrical
cables properly connected?
b. Are valves and controls properly set?
c. Do the fluid supplies, solenoids, and spray gun
have sufficient air pressure?
d. Do the fluid supplies need refilling?
2. If there is a process control problem, refer to your
controller manual.
Common Causes
• The flow rate is too high.
• Highly unbalanced pressures from the fluid supply
system.
• Slow actuation of component A or B dispense
valves.
• System leaks.
Unbalanced Pressure
1. Check all component fluid supply pressures.
2. If the fluid supply pressures are not about equal,
adjust their fluid pressure regulators, until the pres-
sures are about the same.
3. If the pressures are already about equal, verify that
the dose valves are operating properly.
Dose Valve Operation
Manually operate the dose valves by actuating their
solenoids. The valves should snap open and shut
quickly. If the valves move slowly, it could be caused by:
• Air pressure to the valve actuators is too low.
Minimum: 75 psi (0.52 MPa, 5.2 bar)
Recommended: 85 psi (0.6 MPa, 6.0 bar).
• Valve actuating air constricted by dirt or water in the
air supply.
• Solenoid or tubing restricted.
• Dose valve seals need lubrication (see manual
312782).
• Air piston o-rings and packings are not lubricated
(see manual 312782),
• Valve setting is turned out too far. See Mix Manifold
Valve Settings, page 8.