Graco ProMix II Series, Запасные части, Страница: 12 / 40

Troubleshooting
◆
Solenoid Troubleshooting
12 310653D
Solenoid Troubleshooting
If the dispense or purge valves are not turning on or off correctly, it could be caused by one of the following.
Operator Station Troubleshooting
Refer to the Pneumatic Diagram, page 30.
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 Smart Fluid Panel cover and
pressing and releasing solenoid valve override buttons. F
IG
. 3.
Use the control board diagnostics to check the signals (page 13). 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.
• Packings on the mix manifold dispense valves are too tight. Torque
should be 25 in-lbs (2.8 N•m).
• A dispense valve is turned in too far. See ProMix™ II 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.
Dispense A
Dispense B
Purge Air
Purge
Solvent
F
IG
. 3
Problem Cause Solution
Nothing displayed Power is off Turn on power
Faulty cable Check or replace cable
Circuit board failure Replace circuit board
Error code E1 Faulty fiber optic cable between
EasyKey™ and fluid panel Check or replace cable