Solenoid Troubleshooting; Operator Station Troubleshooting - Graco ProMix II Service And Parts

Troubleshooting ◆ Solenoid Troubleshooting

Solenoid Troubleshooting

Refer to the Pneumatic Diagram, page 30.
If the dispense or purge valves are not turning on or off correctly, it could be caused by one of the following.
Cause
1.
Air regulator pressure set too
high or too low.
2.
Air or electrical lines damaged
or connections loose.
3.
Solenoid failure
Purge
Solvent
Purge Air
Dispense B
Dispense A
F . 3
IG
4.
Solenoid, cable, or fluid panel
control board failure.

Operator Station Troubleshooting

Problem
Nothing displayed
Error code E1
12
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),
Visually inspect air and electrical lines for kinks, damage, or loose connec-
tions. Service as needed.
Manually operate the valves by removing the Smart Fluid Panel cover and
pressing and releasing solenoid valve override buttons. F
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.
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.
Cause
Power is off
Faulty cable
Circuit board failure
Faulty fiber optic cable between
EasyKey™ and fluid panel
Solution
IG
Solution
Turn on power
Check or replace cable
Replace circuit board
Check or replace cable
. 3.
310653B