Ratio_Low_Alarm - Graco ProMix 2KS Operation

Alarm Troubleshooting
E-4: RATIO LOW ALARM
Sequential Dosing System
The mix ratio is lower than the set tolerance on the previous dose cycle.
Dynamic Dosing System
The mix ratio is lower than the set tolerance for an A to B component volume comparison.
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
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.
• A dose valve is turned in too far.
• Fluid pressure is high and air pressure is low.
118
Table 17. Alarm Troubleshooting
• Check that the system is fully loaded with material.
• Check that the supply pump's cycle rate is set prop-
erly.
• 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.
A djust component A and B fluid supply regulator pres-
sures until they are about equal. If the pressures are
already about equal, verify that component A and B dose
valves are operating properly.
Manually operate the Dispense A and B solenoid valves
as instructed in the ProMix 2KS 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.
• Refer to Table 13: Mix Manifold Valve Settings,
page 89, for adjustment guidelines.
• Adjust air and fluid pressure. See recommended air
pressure above.
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Solution
312779E