Graco 312787G Troubleshooting, Color Change Solenoid Valves, Color Change Board Fuse

Troubleshooting

Troubleshooting

Color Change Solenoid Valves

NOTE: Refer to the Schematic Diagrams, page 14. If the color change valves are not turning on or off correctly, it could be caused by one of the following.

Cause	Solution
1. Air regulator pressure set too	Check air pressure. 80-90 psi (550-630 kPa, 5.5-6.3 bar) is commonly used.
high or too low.	Do not go below 75 psi (0.52 MPa, 5.2 bar) or above 100 psi (0.7 MPa, 7 bar).
2. Air or electrical lines dam-	Visually inspect air and electrical lines for kinks, damage, or loose connec-
aged or connections loose.	tions. Service or replace as needed.
3. Solenoid failure.	Check the applicable solenoid’s LED (see FIG. 7 and Table 4). If lit, proceed
	with the following checks. If not lit, go to Cause 4.
	Remove the connector for the applicable solenoid and measure voltage across
	the pins on the board. If voltage is between 9-15 Vdc, replace the solenoid.
	Manually operate the valves by removing the color change module cover and
	pressing and releasing solenoid valve override buttons. FIG. 6.
	Valves should snap open and shut quickly. If the valves actuate slowly, it could
	be caused by:
	• Air pressure to the valve actuators is too low. See Cause 1.
	• Solenoid is clogged. Make sure air supply has 10 micron filter installed.
	• Something is restricting the solenoid or tubing. Check for air output from air
	line for corresponding solenoid when valve is actuated. Clear restriction.
4. Fluid station control board or	If there is no voltage across the pins on the board or it is less than 9 Vdc,
cable failure.	check LEDs D9 and D10 (see FIG. 7 and Table 4). If both are lit and function-
	ing properly, or other solenoids in the module are working properly, replace the
	color change board.
	If D9 and D10 are not lit:
	• Check if the cable is disconnected or damaged.
	• Check the fluid station control board (see the ProMix 2KS Repair-Parts
	Manual).

Color Change Board Fuse

Problem	Cause	Solution
No power to board. Communication	Color change board fuse (F1) is	Verify condition of fuse. Replace if
between color change module and	blown.	necessary. See page 11.
fluid station is interrupted.

10 312787G