Dispense Valves; Led Diagnostic Information - Graco PCF Instructions And Parts

Troubleshooting

Dispense Valves

Problem
Valve not opening
Valve not shutting off
Sluggish open/close
Material leaks from back of valve
Air leaks from dispense valve

LED Diagnostic Information

The following LED signals, diagnosis, and solutions are the same for the display module, fluid control module, and
Discrete Gateway module.
Module Status LED Signal
Green on
Yellow
Red solid
Red flashing fast
Red flashing slow
54
Cause
Air not getting to open port
No "Gun On" signal from automa-
tion unit
Air not getting to close port (except
AutoPlus valve)
"Gun On" signal from automation
unit is on
Air pressure low
Needle/seat worn
Pressurized material past the valve
shut-off is escaping
Shaft seal is worn
Loose air connections
Worn piston o-ring
Diagnosis
System is powered up
Internal communication in progress
Hardware failure
Uploading software
Token error
Solution
Verify air pressure solenoid
Check input from automation unit
Verify air pressure to solenoid
Verify solenoid operation
Verify air line routing and connec-
tions
Check input from automation unit
Verify air pressure is above 60 psi
(0.4 MPa, 4 bar)
Rebuild valve; replace needle/seat
Reduce running pressure
Reduce nozzle length
Increase nozzle orifice size
Rebuild valve; replace seals
Check air connections; tighten if
necessary
Rebuild valve; replace piston o-ring
Solution
-
-
Replace display module, fluid control
module, or Gateway module
-
Remove token and upload software
token again.
313377B