Valves - Graco HydroShield WABH00 Instructions - Parts Manual

Troubleshooting
Troubleshooting Color
Troubleshooting Troubleshooting
All color change solenoid valves may be exercised individually for diagnostic purposes through the control
interface starting with Maintenance screen 10.
Cause
Cause Cause
1. Air regulator pressure
set too high or too low.
2. Air or electrical lines
damaged or connections
are loose.
3. Solenoid failure.
4. Control board or cable
failure.
78
Color Change Change Solenoid Solenoid Valves
Color Change Solenoid
Solution
Solution Solution
Check that air pressure is at least 85 psi (0.6 MPa, 6.0 bar). Do not go above 100
psi (0.7 MPa, 7.0 bar).
Visually inspect air and electrical lines for kinks, damage, or loose connections.
Service or replace as needed.
Check the applicable solenoid's LED; see
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:
• In a non-hazardous location, replace the solenoid if voltage is 24 Vdc.
Test the valves as explained under the maintenance screens. Valves should
open and close 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 the air supply has a 5 micron filter installed.
• Something is restricting the solenoid or tubing. Check for air output from the
air line for the corresponding solenoid when the valve is actuated. Clear the
restriction.
If there is no voltage across the pins on the board or it is less than 9 Vdc, check
LEDs D8, D9, and D10. If they are lit and functioning properly, or other solenoids
in the module are working properly, replace the color change board.
If D9 is not lit:
• Verify the condition of the fuse (F1) and replace if necessary. See
Replace the Color Change Board Fuse, page
• Check if the cable is disconnected or damaged.
If D8 is not blinking:
• Cycle the system power.
• Check if the cable is disconnected or damaged.
If D10 is not occasionally blinking:
• Check if the cable is disconnected or damaged.

Valves

Valves
Color Change Board, page
108.
79. If lit,
3A8492A