Troubleshooting
5-5
Part 1603227-12
E 2016 Nordson Corporation
General Troubleshooting Chart
Problem Possible Cause Corrective Action
1. Uneven pattern,
unsteady or
inadequate powder
flow
Blockage in spray gun, powder
feed hose, or pump
1. Purge the spray gun. Remove
the nozzle and electrode
assembly and clean them.
2. Disconnect the powder feed hose
from the spray gun and blow out
the gun with an air gun.
3. Disconnect the feed hose from
the pump and gun and blow out
the feed hose. Replace the feed
hose if it is clogged with powder.
4. Disassemble and clean the pump.
5. Disassemble the spray gun.
Remove the inlet and outlet tubes
and elbow and clean them.
Replace components as
necessary.
Nozzle, deflector, or electrode
assembly worn, affecting pattern
Remove, clean, and inspect the
nozzle, deflector, and electrode
assembly. Replace worn parts as
necessary.
If excessive wear or impact fusion is
a problem, reduce the flow rate and
atomizing air flow.
Damp powder Check the powder supply, air filters,
and dryer. Replace the powder
supply if contaminated.
Low atomizing or flow air pressure Increase the atomizing and/or flow air
flow.
Improper fluidization of powder in
hopper
Increase the fluidizing air pressure.
If the problem persists, remove the
powder from the hopper. Clean or
replace the fluidizing plate if
contaminated.
iFlow module out of calibration Perform the Re-Zero Procedure on
page 5-9.
2. Voids in powder
pattern
Worn nozzle or deflector Remove and inspect the nozzle or
deflector. Replace worn parts.
Plugged electrode assembly or
powder path
Remove the electrode assembly and
clean it. Remove powder path if
necessary and clean it.
Electrode air wash flow too high Adjust the needle valve at the power
unit to decrease the electrode air
wash flow.
Continued...
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