Troubleshooting
5-4
Part 1604857-04
E 2014 Nordson Corporation
Corrective ActionPossible CauseProblem
8. No purge air when
gun purge switch is
pressed down
Malfunctioning spray gun trigger
switch or cable, or controller
manifold purge solenoid valve; no
air pressure, or kinked air tubing
If the controller interface does not
display P when the purge switch is
pressed, the gun trigger switch may
be defective.
Perform the Gun Cable Continuity
Test on page 5-7. If the cable is
good, replace the trigger switch.
If the interface displays P when the
purge switch is pressed, check the
purge air tubing and purge manifold
solenoid valve.
9. Low powder flow or
powder flow surging
Low supply air pressure Input air must be greater than 4.1 bar
(60 psi).
Supply air filter plugged or filter
bowl full—water contamination of
controller
Remove the filter bowl and drain
water/dirt. Replace the filter element
if necessary. Clean the system,
replace components as necessary.
Flow air valve plugged Remove the valve and check the
manifold passages. If the manifold is
clean, replace the valve.
Air tubing kinked or plugged Check the flow and atomizing air
tubing for kinks.
Pump throat worn Replace the pump throat.
Pump not assembled correctly Check the pump.
Pick-up tube blocked Check for debris or bag (VBF units)
blocking pick-up tube.
Vibratory box feeder disabled
(VBF units only)
Make sure sure the controller is
configured for a VBF system. Refer
to the Setup section.
Fluidizing air too high If fluidizing air is set too high the ratio
of powder to air will be be too low.
Fluidizing air too low If fluidizing air is set too low the pump
will not operate at peak efficiency.
Powder hose plugged or kinked Check for kinks in hose, blow out with
compressed air.
Powder hose too long or diameter
too small
25-ft of 11-mm ID hose is shipped
with the system. If using a longer
hose, switch to 1/2 in. ID hose.
Shorten the hose if necessary.
Gun powder path plugged Check the inlet tube, elbow, outlet
tube, and electrode support for
impact fusion or debris. Clean as
necessary with compressed air.
Flow and atomizing air tubing
connections reversed
Check flow and atomizing air tubing
routing and switch if incorrect.
Continued...
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