Graco ProMix 2KE Operation page 48

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.
48
Cause
There is too much restriction in the sys-
tem.
If the alarm occurs during start up, after
purging, the flow rate was probably too
high.
If the alarm occurred after you were
spraying for some time, the pressures
from the fluid supplies could be unbal-
anced.
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 actua-
tion air.
• Dose Valve B is turned in too far.
Dose Valve A is open too far.
• Fluid pressure is high and air pres-
sure 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 appli-
cation, 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 supply
regulator pressures until they are about
equal. If the pressures are already
about equal, verify that component A
and B dose valves are operating prop-
erly.
Manually operate the Dispense A and B
solenoid valves as instructed in the Pro-
Mix 2KE Repair-Parts manual to check
operation.
• Increase air pressure. Air pressure
must be 75-120 psi (0.52-0.84 MPa,
5.2-8.4 bar); 120 psi is recom-
mended.
• There may be dirt or moisture in the
air supply. Filter appropriately. Verify
that solenoids are operational.
• Refer to Valve Settings, page 28,
for adjustment guidelines.
• Adjust air and fluid pressure. See
recommended air pressure above.
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