Troubleshooting
312780K 19
NOTE: Refer to the Schematic Diagrams, page 32.
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. 5.
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 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.
• A dose valve is turned in too far. See ProMix 2KS Operation manual for
settings.
• Fluid pressure is high and air pressure is low.
• Fluid seal in valve has failed. See corresponding valve manual for repair
information.
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.
5. Blown fuse. Check condition of fuses F1 and F2. F1 powers J9 and J14 (Dose Valve A
and B and Purge Valve A and B solenoids). F2 powers J8 and J15 (3rd
Purge Valve, Dump Valve A and B, and GFB 1 and 2 solenoids).
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