R1 Ratio Low Error - Graco ProMix 2KE Operation

System Errors
Alarm and Description
R1
Ratio Low Error
The mix ratio is lower than the
set tolerance for an A to B
component volume compari-
son.
58
Cause
There is too much restriction in the
system.
If the alarm occurs during start up, after
purging, the flow rate was probably too
high.
If the alarm occurred after you were spray-
ing for some time, the pressures from the
fluid supplies could be unbalanced.
Slow actuation of the component A or B
valves. This can be caused by:
• Air pressure to the valve actuators is
too low.
• Something is restricting the solenoid or
tubing and interrupting valve actuation
air.
• Dose Valve B is turned in too far.
Dose Valve A is open too far.
• Fluid pressure is high and air pressure
is low.
Solution
• 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
clogged.
• Check that the fluid regulator is
set properly.
Restrict gun needle travel to slow
down the initial fluid delivery rate until
fluid hoses are loaded with material.
Adjust 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.
Manually operate the Dose Valve A
and B solenoid valves as instructed in
the ProMix 2KE Repair-Parts manual
to check operation.
• 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.
• There may be dirt or moisture in
the air supply. Filter appropri-
ately. Verify that solenoids are
operational.
• Refer to Valve Settings, page 37,
for adjustment guidelines.
• Adjust air and fluid pressure. See
recommended air pressure
above.
3A0868L