Troubleshooting
5-2
Part 1612500−02
E 2018 Nordson Corporation
General Troubleshooting Chart
Problem Possible Cause Corrective Action
1. Uneven pattern,
unsteady or
inadequate powder
flow
Blockage in spray gun, powder
hose, or pump
1. Purge the spray gun. Remove
and clean the nozzle and
electrode assembly.
2. Disconnect the powder hose from
the spray gun. Blow out the spray
gun with an air gun.
3. Disconnect the powder hose from
the pump and gun and blow out
the hose. Replace the hose if it is
clogged with powder.
4. Disassemble and clean the pump.
5. Disassemble the spray gun.
Remove and clean the inlet and
outlet tubes and elbow. Replace
components as necessary.
Nozzle, deflector, or electrode
assembly worn, affecting pattern
Remove and clean the nozzle,
deflector, and electrode assembly.
Replace worn parts as necessary.
If excessive wear or impact fusion is
a problem, reduce the flow and
atomizing air.
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.
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 and clean the electrode
assembly. Remove and clean the
spray gun powder path (inlet tube,
elbow, and outlet tube) if necessary.
Continued...
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