User's Manual

Troubleshooting
3A1164B 15
NOTE: Refer to the Schematic Diagrams, page 26.
If the dispense or purge 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
high or too low.
Check air pressure. 80-90 psi (550-630 kPa, 5.5-6.3 bar) is commonly used.
Do not go below 70 psi (490 kPa, 4.9 bar) or above 120 psi (0.8 MPa, 8 bar).
2. Air or electrical lines damaged or
connections loose.
Visually inspect air and electrical lines for kinks, damage, or loose connec-
tions. Service or replace as needed.
3. Solenoid failure Manually operate the valves by removing the Fluid Station cover and press-
ing and releasing solenoid valve override buttons. F
IG. 4.
Use the control board diagnostics to check the signals. 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 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 restric-
tion.
• A dose valve is turned in too far. See ProControl 1KS Operation manual
for settings.
• Fluid pressure is high and air pressure is low.
4. Solenoid, cable, or fluid station
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.