User's Manual

Troubleshooting
32 3A0260H
Dispense Valves
Measured flow does not match
command
Supply pressure too low Verify inlet pressure needed for flow
rate
Flow rate too high for application Perform dispense weight verification,
see Calibration procedure on
page 25; Lower flow rate and repeat
Gear meter is not calibrated Perform calibration; Perform weight
verification, see Calibration proce-
dure on page 25
Gear meter is worn or damaged Perform weight verification, see Cal-
ibration procedure on page 25; if
weights are not repeatable repair or
replace gear meter
Problem Cause Solution
Valve not opening Air not getting to open port Verify air pressure solenoid
No Dispense Trigger signal from
automation unit
Check input from automation unit
Valve not shutting off Air not getting to close port (except
AutoPlus valve)
Verify air pressure to solenoid
Verify solenoid operation
Verify air line routing and connec-
tions
Dispense Trigger signal from auto-
mation unit is on
Check input from automation unit
Sluggish open/close Air pressure low Verify air pressure is above 60 psi
(0.4 MPa, 4 bar)
Needle/seat worn Rebuild valve; replace needle/seat
Pressurized material past the valve
shut-off is escaping
Reduce running pressure
Reduce nozzle length
Increase nozzle orifice size
Material leaks from back of valve Shaft seal is worn Rebuild valve; replace seals
Air leaks from dispense valve Loose air connections Check air connections; tighten if
necessary
Worn piston o-ring Rebuild valve; replace piston o-ring