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System Errors
3A0868G 57
R4
Ratio High Error
The mix ratio is higher than
the set tolerance for an A to B
component volume compari-
son.
There is too little restriction in the system. • Check that the system is fully
loaded with material.
• Check that the supply pump’s
cycle rate is set properly.
• Check that the spray tip/nozzle is
properly sized for the flow and
application, and that it is not
worn.
• Check that the fluid regulator is
set properly.
If the alarm occurs during start up, after
purging, the flow rate was probably too
high.
Restrict gun needle travel to slow
down the initial fluid delivery rate until
fluid hoses are loaded with material.
If the alarm occurred after you were spray-
ing for some time, the pressures from the
fluid supplies could be unbalanced.
A
djust component A and B fluid sup-
ply regulator pressures until they are
about equal.
If the pressures are
already about equal,
verify that com-
ponent A and B dose valves are oper-
ating properly.
Slow actuation of the component A or B
valves. This can be caused by:
Manually operate the Dose Valve A
and B solenoid valves to check oper-
ation.
• Air pressure to the valve actuators is
too low.
• Increase air pressure. Air pres-
sure must be 75-120 psi
(0.52-0.84 MPa, 5.2-8.4 bar); 120
psi is recommended.
• Something is restricting the solenoid or
tubing and interrupting valve actuation
air.
• There may be dirt or moisture in
the air supply. Filter appropri-
ately.
• Dose Valve B is turned in too far.
Dose Valve A is open too far.
• Refer to Valve Settings, page
35, for adjustment guidelines.
• Fluid pressure is high and air pressure
is low.
• Adjust air and fluid pressure. See
recommended air pressure
above.
QDA1
Overdose A
The A dose has overshot and,
when combined with B, is too
large for the mix manifold
capacity.
QDB1
Overdose B
The B dose has overshot,
forcing an A dose that, when
combined with B, is too large
for the mix manifold capacity.
Valve seal or needle/seat are leaking. Repair the valve.
Slow actuation of component A or B valves. See Ratio Low Error and Ratio High
Error, pages 56-57.
Running a high mix ratio and a high flow
rate.
It may be necessary to restrict the
flow rate through the component B
dose valve by adjusting its hex nut.
Alarm and Description Cause Solution