Graco 3A0868G important safety instructions Ratio Low Error, Already about equal, verify that com

System Errors

Alarm and Description	Cause	Solution
R1	There is too much restriction in the	• Check that the system is fully
Ratio Low Error	system.	loaded with material.
The mix ratio is lower than the		• Check that the supply pump’s
set tolerance for an A to B
		cycle rate is set properly.
component volume compari-
son.		• 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.
	If the alarm occurs during start up, after	Restrict gun needle travel to slow
	purging, the flow rate was probably too	down the initial fluid delivery rate until
	high.	fluid hoses are loaded with material.
	If the alarm occurred after you were spray-	Adjust component A and B fluid sup-
	ing for some time, the pressures from the	ply regulator pressures until they are
	fluid supplies could be unbalanced.	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	Manually operate the Dose Valve A
	valves. This can be caused by:	and B solenoid valves as instructed in
		the ProMix 2KE Repair-Parts manual
		to check operation.
	• Air pressure to the valve actuators is	• Increase air pressure. Air pres-
	too low.	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	• There may be dirt or moisture in
	tubing and interrupting valve actuation	the air supply. Filter appropri-
	air.	ately. Verify that solenoids are
		operational.
	• Dose Valve B is turned in too far.	• Refer to Valve Settings, page
	Dose Valve A is open too far.	35, for adjustment guidelines.
	• Fluid pressure is high and air pressure	• Adjust air and fluid pressure. See
	is low.	recommended air pressure
		above.

56 3A0868G