R1 Ratio Low Error - Graco ProMix 2KE Operation

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.
3A0869C
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
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 A1 (A2, A3) is turned in
too far.
Dose Valve B 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 Dose Valve A1
(A2, A3) and B solenoid valves as
instructed in the ProMix 2KE
Repair-Parts manual to check opera-
tion.
• 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.
• Refer to Valve Settings, page 37,
for adjustment guidelines.
• Adjust air and fluid pressure. See
recommended air pressure above.
System Errors
57