Dispense Valves - Graco PrecisionSwirl Instructions-Parts List Manual

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
Swirl Dispenser
Problem
Motor not running (motor fault alarm
active)
Motor not running (motor fault alarm
not active)
68
Cause
Air not getting to the open port
No "Valve On" signal from automa-
tion unit
Air not getting to the close port
(except AutoPlus valve)
"Valve On" signal from automation
unit is on
Air pressure low
Needle/seat worn
Pressurized material past the valve
shut-off is escaping
Faulty solenoid valve
Solenoid valve muffler restricted
Shaft seal is worn
Loose air connections
Worn piston o-ring
Cause
Cable disconnected
CAN cable was re-connected with
system power on (amber LED on
swirl board will be on, this indicates
circuit protection was triggered)
Shorted motor cable (amber LED on
swirl board will be on, this indicates
circuit protection was triggered)
Faulty swirl orbiter
Cable disconnected
No "Swirl Enable" signal from auto-
mation unit
Swirl not installed
Solution
Verify air pressure to 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
(410 kPa, 4.1 bar)
Rebuild valve; replace needle/seat
Reduce running pressure
Reduce nozzle length
Increase nozzle orifice size
Replace solenoid valve
Clean or replace muffler
Rebuild valve; replace seals
Check air connections; tighten if
necessary
Rebuild valve; replace piston o-ring
Solution
Verify cable connections to swirl
board, swirl motor cable, and swirl
orbiter
Cycle system power
Replace swirl motor cable (55 ft)
then cycle power
Replace swirl orbiter
Verify cable connections to swirl
board, swirl board power cable, and
swirl control DGM
Check input from automation unit
Verify that the proper swirl orbiter is
installed in the system setup screen
3A2098S