NPE-LF10 and NPE-HF10 Powder Spray Guns
11
Part 108191C
E
2003 Nordson Corporation
Troubleshooting
WARNING:
Allow only qualified personnel to perform the following tasks.
Follow the safety instructions in this document and all other related
documentation.
This section contains troubleshooting procedures. These procedures cover
only the most common problems that you may encounter. If you cannot
solve the problem with the information given here, contact your local
Nordson representative for help.
Problem
Possible Cause
Corrective Action
1. Powder puffing or
surging from spray
gun
Atomizing air pressure too low
Increase the atomizing air pressure.
Poor fluidization of powder in
hopper
Increase the fluidizing air pressure.
Wet powder
Inspect the powder in the hopper.
Replace the powder if it is damp.
Check the air supply filters and air
dryer.
2. Powder drooling from
spray gun
Poor atomization of powder
Increase the atomizing air pressure.
3. Uneven pattern or
voids in pattern
Worn nozzle
Replace the nozzle.
Impact fusion on interior surfaces
of nozzle or powder tube
Remove the nozzle and clean or
replace the parts as necessary. Do
not use a sharp, pointed metal tool to
clean the parts. Scratches on the
powder-contact surfaces will
accumulate powder and cause the
powder to fuse on impact.
Low atomizing air pressure
Increase the atomizing air pressure.
4. Inadequate or no
powder flow
Plugged hose, pump, or spray gun
Disassemble the powder pump and
spray gun and clean them. Blow out
the feed hose. Inspect the powder
supply for contamination by moisture
or oil.
Worn venturi nozzle or throat in
pump
Disassemble the powder pump,
inspect the parts, and replace them if
they are worn.
Power unit malfunction
Refer to the power unit manual.
No or poor fluidization of powder in
feed hopper
Increase the fluidizing air pressure.
Inspect the fluidization plate for
discoloration or other evidence of
plugging.
