Solenoid Troubleshooting
14
311189L
Solenoid Troubleshooting
If the dispense, purge, or dump valves are not turning on or off correctly, it could be caused by one of the following.
NOTE: Refer to the Pneumatic Diagram, page
28.
Cause
Solution
1.
Air regulator pressure set too
high or too low.
Check air pressure. 80 psi (550 kPa, 5.5 bar) is commonly used. Do not go
below 75 psi (517 kPa, 5.2 bar) or above 100 psi (0.7 MPa, 7 bar),
2.
Air or electrical lines damaged
or connections loose.
Visually inspect air and electrical lines for kinks, damage, or loose connec-
tions. Service as needed.
3.
Solenoid failure
Manually operate the valves by removing the Fluid Panel cover and pressing
and releasing solenoid valve override buttons. F
. 7. Fluid valves should
operate when solenoid override is activated.
Use the control board diagnostics to check the signals (page 15). If signals
do not occur correctly, go to Cause 4.
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 5 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 restric-
tion.
•
Packings on the mix manifold dispense valves are too tight. Torque
should be 25 in-lbs (2.8 N•m). (Wall Mount Fluid Panel only.)
•
Dispense Valve Travel Adjustment (Wall Mount Fluid Panel only) is
turned in too far. See ProMix™ Auto Operation manual for settings.
•
Fluid pressure is high and air pressure is low.
4.
Solenoid, cable, or fluid panel
control board failure.
Check voltage level to solenoid by pulling solenoid connector and checking
voltage between pins.
If voltage is 9-15 VDC, the solenoid is damaged. Replace solenoid or correct
electrical line problem.
If there is no voltage, replace the board.
Check circuit board LEDs.
Dispense B
Purge Air
Purge
Solvent
F
IG
. 7
Dispense A
Dump B
Dump A
